# Constantinos Valagiannopoulos

**Department**

**Title**

**Office**

**Phone**

**Website**

**Constantinos**(Costas)

**Valagiannopoulos**is an Associate Professor in the Department of Physics of Nazarbayev University (NU), Kazakhstan since August 2015, when he joined NU as an Assistant Professor. He leads the Metamaterials Modeling and Design Group at NU, performing research on the forward and inverse design of photonic devices manipulating the light as well as on the translation of electromagnetic concepts into quantum systems. He has authored or coauthored more than

**100**works published at international refereed scientific journals (Scopus Q1) and presented numerous reports in scientific conferences. He is currently participating as Principal Investigator (PI) or co-PI in the successful execution of national and international research grants of total annual budget larger than

**600K USD**.

He obtained his Degree in Electrical and Computer Engineering (1999-2004) with honors and pursued his PhD (2004-2009) in Electromagnetic Theory at the National Technical University of Athens (NTUA), Greece. He then (2010-2014) joined Aalto University, Finland as a member of Theoretical and Applied Electromagnetics of Complex Media group (AaltoReference, Advisor: Sergei Tretyakov), while later he was with the Metamaterials and Plasmonics Laboratory (AustinReference, Advisor: Andrea Alu) to University of Texas at Austin, USA (2014-2015). During the last two years (2015-2017), he has done internships to Harvard University (HarvardReference) and University of Southampton (SouthamptonReference).

In April 2018, he was elected OSA Senior Member, in May 2017 and 2018 received OSA’s reviewer recognition, in April 2016 was elevated to IEEE Senior Member, while in December of 2015 he received the Journal of Optics Research Excellence Award 2015. In May of 2008 he received the International Chorafas Award and the competitive Thomaides Award for the Best Doctoral Thesis. He was a Guest Editor for MDPI Photonics for the special issue including selected papers presented at 2019 Metamaterials Congress. He has won a Newton Al-Farabi Researcher Links Travel Grant for 2017 and he is the winner of the 2020 NU Teaching Award for Integrating Research and Teaching.

Full list of publications can be found on google scholar page. For more information, also visit ResearchGate, Academia, OrcID and LinkedIn.

Engineering the emission of laser arrays to nullify the jamming from passive obstacles

Valagiannopoulos, C., Kovanis, V.,

On-Site Wireless Power Generation

Ra'di, Y., Chowkwale, B., Valagiannopoulos, C., Liu, F., Alu, A., Simovski, C., Tretyakov, S.,

Photonic crystals for optimal color conversion in light-emitting diodes: A semi-analytical approach

Valagiannopoulos, C., Lagoudakis, P.,

On self-oscillating wireless power transfer

Tretyakov, S., Valagiannopoulos, C., Ra'Di, Y., Simovski, C.,

Nonlinear waves in hyperbolic metamaterials: Focus on solitons and rogues

Boardman, A., Grimalsky, V., Guo, T., Kibler, B., McNiff, J., Nefedov, I., Rapoport, Y., Argyropoulos, C., Valagiannopoulos, C.,

Wide-angle absorption of visible light from simple bilayers

Papadimopoulos, A., Kantartzis, N., Tsitsas, N., Valagiannopoulos, C.,

Mitigating Snell's-Law reflection and transmission with metasurfaces of ordinary dielectrics

Tsitsas, N., Valagiannopoulos, C.,

Waves in hyperbolic and double negative metamaterials including rogues and solitons

Boardman, A., Alberucci, A., Assanto, G., Grimalsky, V., Kibler, B., McNiff, J., Nefedov, I., Rapoport, Y., Valagiannopoulos, C.,

Judicious distribution of laser emitters to shape the desired far-field patterns

Valagiannopoulos, C., Kovanis, V.,

Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces

Savoia, S., Valagiannopoulos, C., Monticone, F., Castaldi, G., Galdi, V., Alù, A.,

Giant enhancement of the controllable in-plane anisotropy of biased isotropic noncentrosymmetric materials with epsilon-negative multilayers

Valagiannopoulos, C., Tsitsas, N., Lakhtakia, A.,

Anomalous reflection of visible light by all-dielectric gradient metasurfaces [Invited]

Tsitsas, N., Valagiannopoulos, C.,

Conjugately-matched uniaxial metamaterials make extremely efficient absorbers, emitters, and reflectors

Valagiannopoulos, C., Simovski, C., Tretyakov, S.,

Analytical investigations of ground modifications assisting the detection of a buried object

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

Theoretical concepts of unlimited-power reflectors, absorbers, and emitters with conjugately matched layers

Valagiannopoulos, C., Tretyakov, S.,

Optical PT-Symmetric Counterparts of Ordinary Metals

Valagiannopoulos, C.,

'Unlocking' the Ground: Increasing the Detectability of Buried Objects by Depositing Passive Superstrates

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

Radiation-enhancing reflector

Valagiannopoulos, C., Tretyakov, S.,

Guessing the texture of magnetic samples assisted by Aharonov-Bohm effect

Valagiannopoulos, C., Alù, A., Dimakis, A., Marengo, E.,

PT-symmetric planar devices for field transformation and imaging

Valagiannopoulos, C., Monticone, F., Alù, A.,

Consistent Integral Equation Modeling of Cloaking Planar Microstrip Antennas

Papadimopoulos, A., Tsitsas, N., Valagiannopoulos, C., Kantartzis, N., Antonopoulos, C., Tsiboukis, T.,

Parity-time Symmetric nonlocal metasurfaces: All-angle negative refraction and volumetric imaging

Monticone, F., Valagiannopoulos, C., Alù, A.,

Epsilon-near-zero behavior from plasmonic Dirac point: Theory and realization using two-dimensional materials

Mattheakis, M., Valagiannopoulos, C., Kaxiras, E.,

Aharonov-Bohm detection of two-dimensional magnetostatic cloaks

Valagiannopoulos, C., Askarpour, A., Alù, A.,

Electromagnetic energy sink

Valagiannopoulos, C., Vehmas, J., Simovski, C., Tretyakov, S., Maslovski, S.,

PT-symmetric metamaterial systems for aberration-free imaging and wave manipulation

Monticone, F., Valagiannopoulos, C., Savoia, S., Fleury, R., Alu, A.,

Blacker than ideally black: Double negative conjugately matched cylinders

Vehmas, J., Valagiannopoulos, C., Tretyakov, S., Maslovski, S.,

Aberration-free planar focusing based on parity-time symmetric nonlocal metamaterials

Monticone, F., Alu, A., Valagiannopoulos, C.,

Amplifying the response of a buried object by depositing a passive layer on the ground

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

Excitation of a grounded lossy dielectric slab by an external complex source point beam

Tsitsas, N., Valagiannopoulos, C.,

Cloaking a bump inside a single isotropic lossless dielectric

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

The Role of Reactive Energy in the Radiation by a Dipole Antenna

Valagiannopoulos, C., Alu, A.,

Controlling Reflection and Transmission with a Single Layer

Valagiannopoulos, C.,

Perfect magnetic mirror and simple perfect absorber in the visible spectrum

Valagiannopoulos, C., Tukiainen, A., Aho, T., Niemi, T., Guina, M., Tretyakov, S., Simovski, C.,

Pockels cover for switchable control of the reflection from a grounded, isotropic, lossy dielectric slab

Valagiannopoulos, C., Tsitsas, N., Lakhtakia, A., Burger, A.,

Mimicking the perfect electromagnetic conducting scattering mechanisms with suitable bi-isotropic media

Valagiannopoulos, C., Sihvola, A.,

Hiding a bump on a PEC plane by using an isotropic lossless dielectric layer

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

Symmetric absorbers realized as gratings of PEC cylinders covered by ordinary dielectrics

Valagiannopoulos, C., Tretyakov, S.,

Scattering and absorption of a complex source point beam by a grounded lossy dielectric slab with a superstrate

Tsitsas, N., Valagiannopoulos, C., Nosich, A.,

Demand curves and operator strategies in the finnish mobile broadband market

Katsigiannis, M., Valagiannopoulos, C.,

On the minimal scattering response of PEC cylinders in a dielectric cloak

Valagiannopoulos, C., Alitalo, P., Tretyakov, S.,

Hyperbolic-metamaterial antennas for broadband enhancement of dipole emission to free space

Valagiannopoulos, C., Mirmoosa, M., Nefedov, I., Tretyakov, S., Simovski, C.,

How nonreciprocal is an effective permittivity matrix?

Valagiannopoulos, C.,

Emulating hyperbolic-media properties with conventional structures

Valagiannopoulos, C., Tretyakov, S.,

Low-pass features of optical nano-filters constituted by simple layered structures

Valagiannopoulos, C., Sihvola, A.,

Increasing the electromagnetic attenuation below a quasi-matched surface with use of passive hyperbolic metamaterials

Valagiannopoulos, C., Nefedov, I.,

Coupling between transmission-line networks and homogeneous media: A semianalytical approach

Valagiannopoulos, C., Alitalo, P.,

Electromagnetic absorption of gaussian beams by a grounded layered structure

Valagiannopoulos, C.,

Isolating the singular term of the green's function in the vicinity of the corner formulated by two intersecting waveguides

Valagiannopoulos, C.,

Total absorption in asymmetric hyperbolic media

Nefedov, I., Valagiannopoulos, C., Hashemi, S., Nefedov, E.,

The effective radiation pattern concept for realistic performance estimation of LTE wireless systems

Zarbouti, D., Tsoulos, G., Athanasiadou, G., Valagiannopoulos, C.,

Perfect absorption in graphene multilayers

Valagiannopoulos, C., Nefedov, I.,

Optimal directional pattern design utilizing arbitrary microphone arrays: A continuous-wave approach

Delikaris-Manias, S., Valagiannopoulos, C., Pulkki, V.,

On enhancing the field in the vicinity of a metamaterial wedge with use of an auxiliary dielectric tip

Valagiannopoulos, C., Sihvola, A.,

Low interaction of an arbitrarily large PEC cylinder with em waves filtered through a layered structure

Valagiannopoulos, C.,

Improving the electrostatic field concentration in a negative-permittivity wedge with a grounded "bowtie" configuration

Valagiannopoulos, C., Sihvola, A.,

Design and free-space measurements of a simple electromagnetic cloak for conducting cylindrical objects

Alitalo, P., Valagiannopoulos, C., Culhaoglu, A.,

Concealing a perfectly conducting object with edges inside a dielectric superstrate

Valagiannopoulos, C., Tsitsas, N.,

Computationally efficient optimization of coupling tapers for transmission-line networks under obliquely incident illumination

Valagiannopoulos, C., Alitalo, P.,

Approximating the mechanism of perfect electromagnetic boundaries by using magneto-dielectric materials

Valagiannopoulos, C., Sihvola, A.,

A miniature inhomogeneous cloak following a power law

Valagiannopoulos, C.,

A grating from coated PEC cylinders functioning as an electromagnetic absorber

Valagiannopoulos, C., Tretyakov, S.,

On jamming unfriendly submarine communication by radiating across an island in the vicinity of the opponent's coastline

Valagiannopoulos, C.,

Demonstration of electromagnetic cloaking of conducting object by dielectric material cover

Alitalo, P., Valagiannopoulos, C.,

Electromagnetic cloaking of cylindrical objects by multilayer or uniform dielectric claddings

Valagiannopoulos, C., Alitalo, P.,

Implementation of the thin-wire approximation for estimating the characteristics of a metallic reinforcement bar embedded into a concrete column with circular cross section

Valagiannopoulos, C., Bimpas, M., Uzunoglu, N.,

Convergence analysis and oscillations in the method of fictitious sources applied to dielectric scattering problems

Valagiannopoulos, C., Tsitsas, N., Fikioris, G.,

The influence of refractive index, excitation and observation on PEC/PMC boundary realization

Valagiannopoulos, C., Sihvola, A.,

On modeling perfectly conducting sharp corners with magnetically inert dielectrics of extreme complex permittivities

Valagiannopoulos, C., Sihvola, A.,

Integral equation analysis of a low-profile receiving planar microstrip antenna with a cloaking superstrate

Valagiannopoulos, C., Tsitsas, N.,

Field enhancement in a grounded dielectric slab by using a single superstrate layer

Valagiannopoulos, C., Tsitsas, N.,

Electromagnetic cloaking of PEC cylinders with a single isotropic and homogeneous layer

Valagiannopoulos, C., Alitalo, P.,

Efficient evaluation of the Green's function for a bended coplanar waveguide

Valagiannopoulos, C.,

Dielectric-coated PEC cylinders which do not scatter electromagnetic waves

Valagiannopoulos, C., Alitalo, P., Tretyakov, S.,

Concentrating the electromagnetic power in a grounded dielectric slab excited by an external Gaussian beam

Tsitsas, N., Valagiannopoulos, C.,

Cloaking a microstrip antenna: Integral equation modeling

Valagiannopoulos, C., Tsitsas, N.,

An iterative semi-analytical technique solving the boundary value problem of transmission through an anisotropic wedge

Valagiannopoulos, C., Simovski, C.,

A Cartesian cloaking comprised of gradually sparser dielectric layers exploiting Snell's law

Valagiannopoulos, C.,

Electromagnetic propagation into parallel-plate waveguide in the presence of a skew metallic surface

Valagiannopoulos, C.,

Simplified model for EM inverse scattering by longitudinal subterranean inhomogeneities exploiting the dawn/dusk ionospheric ridge

Valagiannopoulos, C., Uzunoglu, N.,

Simple cloak for antenna blockage reduction

Alitalo, P., Valagiannopoulos, C., Tretyakov, S.,

On adjusting the characteristics of a low-index slab antenna with a finite set of metallic pins

Valagiannopoulos, C.,

High selectivity and controllability of a parallel-plate component with a filled rectangular ridge

Valagiannopoulos, C.,

Electromagnetic scattering of the field of a metamaterial slab antenna by an arbitrarily positioned cluster of metallic cylinders

Valagiannopoulos, C.,

Conversion of evanescent waves into propagating modes by passing through a metamaterial prism: An iterative approximation method

Valagiannopoulos, C., Simovski, C.,

Analytical model for coupling of waves between a homogeneous medium and a volumetric transmission-line network

Valagiannopoulos, C., Alitalo, P., Tretyakov, S.,

A new inverse formula based on the taylor expansion of the scattering integral

Valagiannopoulos, C.,

A novel methodology for estimating the permittivity of a specimen rod at low radio frequencies

Valagiannopoulos, C.,

On developing alternating voltage around a rotating circular ring under plane wave excitation in the presence of an eccentri- cally positioned metallic core

Valagiannopoulos, C.,

Electromagnetic wave scattering by quasi-homogeneous obstacles

Tsitsas, N., Valagiannopoulos, C.,

Convergence and oscillations in method-of-auxiliary-sources analyses of dielectric scattering problems

Valagiannopoulos, C., Tsitsas, N., Fikioris, G.,

Linearization of the T-matrix solution for quasi-homogeneous scatterers

Valagiannopoulos, C., Tsitsas, N.,

Rigorous computation of green's function of a parallel-plate waveguide with a tapered wall

Valagiannopoulos, C., Uzunoglu, N.,

On smoothening the singular field developed in the vicinity of metallic edges

Valagiannopoulos, C.,

Green's function of a parallel plate waveguide with multiple abrupt changes of interwall distances

Valagiannopoulos, C., Uzunoglu, N.,

Analytic stochastic propagation model for urban streets

Karyotis, V., Valagiannopoulos, C.,

On the resonance and radiation characteristics of multi-layered spherical microstrip antennas

Valagiannopoulos, C., Tsitsas, N.,

On measuring the permittivity tensor of an anisotropic material from the transmission coefficients

Valagiannopoulos, C.,

On examining the influence of a thin dielectric strip posed across the diameter of a penetrable radiating cylinder

Valagiannopoulos, C.,

Electromagnetic scattering from two eccentric metamaterial cylinders with frequency-dependent permittivities differing slightly each other

Valagiannopoulos, C.,

A signal coverage model for two neighboring islands of different size

Valagiannopoulos, C.,

Stochastic ray propagation for two parallel urban streets: Exact and approximate results

Valagiannopoulos, C., Karyotis, V.,

Complex resonant frequencies of multi-layered spherical microstrip antennas

Valagiannopoulos, C., Tsitsas, N.,

Closed-form solution to the scattering of a skew strip field by metallic pin in a slab

Valagiannopoulos, C.,

Semi-analytic solution to a cylindrical microstrip with inhomogeneous substrate

Valagiannopoulos, C.,

Rigorous analysis of a metallic circular post in a rectangular waveguide with step discontinuity of sidewalls

Valagiannopoulos, C., Uzunoglu, N.,

Study of an electrically anisotropic cylinder excited magnetically by a straight strip line

Valagiannopoulos, C.,

Single-series solution to the radiation of loop antenna in the presence of a conducting sphere

Valagiannopoulos, C.,

Scattering of ELF waves by underground formations because of night-day ionospheric ridge

Valagiannopoulos, C., Uzunoglu, N.,

Effect of cylindrical scatterer with arbitrary curvature on the features of a metamaterial slab antenna

Valagiannopoulos, C.,

Arbitrary currents on circular cylinder with inhomogeneous cladding and RCS optimization

Valagiannopoulos, C.,

An overview of the watson transformation presented through a simple example

Valagiannopoulos, C.,

Input admittances arising from explicit solutions to integral equations for infinite-length dipole antennas

Fikioris, G., Valagiannopoulos, C.,

On choosing kernel and feed when analyzing dipole antennas via integral equations

Valagiannopoulos, C., Fikioris, G.,

Valagiannopoulos, C., Kovanis, V.,

**2018**In : Photonics Research. 6, 8, p. A43-A50On-Site Wireless Power Generation

Ra'di, Y., Chowkwale, B., Valagiannopoulos, C., Liu, F., Alu, A., Simovski, C., Tretyakov, S.,

**2018**In : IEEE Transactions on Antennas and Propagation.Photonic crystals for optimal color conversion in light-emitting diodes: A semi-analytical approach

Valagiannopoulos, C., Lagoudakis, P.,

**2018**In : Journal of the Optical Society of America B: Optical Physics. 35, 5, p. 1105-1112On self-oscillating wireless power transfer

Tretyakov, S., Valagiannopoulos, C., Ra'Di, Y., Simovski, C.,

**2018**2017 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems, COMCAS 2017. Institute of Electrical and Electronics Engineers Inc., 2017-November, p. 1-3Nonlinear waves in hyperbolic metamaterials: Focus on solitons and rogues

Boardman, A., Grimalsky, V., Guo, T., Kibler, B., McNiff, J., Nefedov, I., Rapoport, Y., Argyropoulos, C., Valagiannopoulos, C.,

**2018**Metamaterials XI. SPIE, 10671,Wide-angle absorption of visible light from simple bilayers

Papadimopoulos, A., Kantartzis, N., Tsitsas, N., Valagiannopoulos, C.,

**2017**In : Applied Optics. 56, 35,Mitigating Snell's-Law reflection and transmission with metasurfaces of ordinary dielectrics

Tsitsas, N., Valagiannopoulos, C.,

**2017**Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017. Institute of Electrical and Electronics Engineers Inc., p. 1160-1163Waves in hyperbolic and double negative metamaterials including rogues and solitons

Boardman, A., Alberucci, A., Assanto, G., Grimalsky, V., Kibler, B., McNiff, J., Nefedov, I., Rapoport, Y., Valagiannopoulos, C.,

**2017**In : Nanotechnology. 28, 44,Judicious distribution of laser emitters to shape the desired far-field patterns

Valagiannopoulos, C., Kovanis, V.,

**2017**In : Physical Review A. 95, 6,Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces

Savoia, S., Valagiannopoulos, C., Monticone, F., Castaldi, G., Galdi, V., Alù, A.,

**2017**In : Physical Review B - Condensed Matter and Materials Physics. 95, 11,Giant enhancement of the controllable in-plane anisotropy of biased isotropic noncentrosymmetric materials with epsilon-negative multilayers

Valagiannopoulos, C., Tsitsas, N., Lakhtakia, A.,

**2017**In : Journal of Applied Physics. 121, 6,Anomalous reflection of visible light by all-dielectric gradient metasurfaces [Invited]

Tsitsas, N., Valagiannopoulos, C.,

**2017**In : Journal of the Optical Society of America B: Optical Physics. 34, 7, p. D1-D8Conjugately-matched uniaxial metamaterials make extremely efficient absorbers, emitters, and reflectors

Valagiannopoulos, C., Simovski, C., Tretyakov, S.,

**2016**2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2016. Institute of Electrical and Electronics Engineers Inc., p. 379-381Analytical investigations of ground modifications assisting the detection of a buried object

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

**2016**2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016. Institute of Electrical and Electronics Engineers Inc., p. 783-786Theoretical concepts of unlimited-power reflectors, absorbers, and emitters with conjugately matched layers

Valagiannopoulos, C., Tretyakov, S.,

**2016**In : Physical Review B. 94, 12,Optical PT-Symmetric Counterparts of Ordinary Metals

Valagiannopoulos, C.,

**2016**In : IEEE Journal on Selected Topics in Quantum Electronics. 22, 5,'Unlocking' the Ground: Increasing the Detectability of Buried Objects by Depositing Passive Superstrates

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

**2016**In : IEEE Transactions on Geoscience and Remote Sensing. 54, 6, p. 3697-3706Radiation-enhancing reflector

Valagiannopoulos, C., Tretyakov, S.,

**2016**2016 10th European Conference on Antennas and Propagation, EuCAP 2016. Institute of Electrical and Electronics Engineers Inc.,Guessing the texture of magnetic samples assisted by Aharonov-Bohm effect

Valagiannopoulos, C., Alù, A., Dimakis, A., Marengo, E.,

**2016**2016 10th European Conference on Antennas and Propagation, EuCAP 2016. Institute of Electrical and Electronics Engineers Inc.,PT-symmetric planar devices for field transformation and imaging

Valagiannopoulos, C., Monticone, F., Alù, A.,

**2016**In : Journal of Optics (United Kingdom). 18, 4,Consistent Integral Equation Modeling of Cloaking Planar Microstrip Antennas

Papadimopoulos, A., Tsitsas, N., Valagiannopoulos, C., Kantartzis, N., Antonopoulos, C., Tsiboukis, T.,

**2016**In : IEEE Transactions on Magnetics. 52, 3,Parity-time Symmetric nonlocal metasurfaces: All-angle negative refraction and volumetric imaging

Monticone, F., Valagiannopoulos, C., Alù, A.,

**2016**In : Physical Review X. 6, 4,Epsilon-near-zero behavior from plasmonic Dirac point: Theory and realization using two-dimensional materials

Mattheakis, M., Valagiannopoulos, C., Kaxiras, E.,

**2016**In : Physical Review B. 94, 20,Aharonov-Bohm detection of two-dimensional magnetostatic cloaks

Valagiannopoulos, C., Askarpour, A., Alù, A.,

**2015**In : Physical Review B - Condensed Matter and Materials Physics. 92, 22,Electromagnetic energy sink

Valagiannopoulos, C., Vehmas, J., Simovski, C., Tretyakov, S., Maslovski, S.,

**2015**In : Physical Review B - Condensed Matter and Materials Physics. 92, 24,PT-symmetric metamaterial systems for aberration-free imaging and wave manipulation

Monticone, F., Valagiannopoulos, C., Savoia, S., Fleury, R., Alu, A.,

**2015**2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2015. Institute of Electrical and Electronics Engineers Inc., p. 223-225Blacker than ideally black: Double negative conjugately matched cylinders

Vehmas, J., Valagiannopoulos, C., Tretyakov, S., Maslovski, S.,

**2015**2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, METAMATERIALS 2015. Institute of Electrical and Electronics Engineers Inc., p. 511-513Aberration-free planar focusing based on parity-time symmetric nonlocal metamaterials

Monticone, F., Alu, A., Valagiannopoulos, C.,

**2015**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). Institute of Electrical and Electronics Engineers Inc., 2015-October, p. 252-253Amplifying the response of a buried object by depositing a passive layer on the ground

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

**2015**2015 Computational Electromagnetics International Workshop, CEM 2015. Institute of Electrical and Electronics Engineers Inc., p. 28-29Excitation of a grounded lossy dielectric slab by an external complex source point beam

Tsitsas, N., Valagiannopoulos, C.,

**2015**2015 9th European Conference on Antennas and Propagation, EuCAP 2015. Institute of Electrical and Electronics Engineers Inc.,Cloaking a bump inside a single isotropic lossless dielectric

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

**2015**2015 9th European Conference on Antennas and Propagation, EuCAP 2015. Institute of Electrical and Electronics Engineers Inc.,The Role of Reactive Energy in the Radiation by a Dipole Antenna

Valagiannopoulos, C., Alu, A.,

**2015**In : IEEE Transactions on Antennas and Propagation. 63, 8, p. 3736-3741Controlling Reflection and Transmission with a Single Layer

Valagiannopoulos, C.,

**2015**In : IEEE Antennas and Propagation Magazine. 57, 2, p. 318-323Perfect magnetic mirror and simple perfect absorber in the visible spectrum

Valagiannopoulos, C., Tukiainen, A., Aho, T., Niemi, T., Guina, M., Tretyakov, S., Simovski, C.,

**2015**In : Physical Review B - Condensed Matter and Materials Physics. 91, 11,Pockels cover for switchable control of the reflection from a grounded, isotropic, lossy dielectric slab

Valagiannopoulos, C., Tsitsas, N., Lakhtakia, A., Burger, A.,

**2015**In : Journal of Applied Physics. 117, 8,Mimicking the perfect electromagnetic conducting scattering mechanisms with suitable bi-isotropic media

Valagiannopoulos, C., Sihvola, A.,

**2014**In : Electromagnetics. 34, 8, p. 593-607Hiding a bump on a PEC plane by using an isotropic lossless dielectric layer

Valagiannopoulos, C., Tsitsas, N., Sihvola, A.,

**2014**In : IEEE Transactions on Antennas and Propagation. 62, 11, p. 5706-5714Symmetric absorbers realized as gratings of PEC cylinders covered by ordinary dielectrics

Valagiannopoulos, C., Tretyakov, S.,

**2014**In : IEEE Transactions on Antennas and Propagation. 62, 10, p. 5089-5098Scattering and absorption of a complex source point beam by a grounded lossy dielectric slab with a superstrate

Tsitsas, N., Valagiannopoulos, C., Nosich, A.,

**2014**In : Journal of Optics (United Kingdom). 16, 10,Demand curves and operator strategies in the finnish mobile broadband market

Katsigiannis, M., Valagiannopoulos, C.,

**2014**In : International Journal of Business Data Communications and Networking. 10, 1, p. 30-46On the minimal scattering response of PEC cylinders in a dielectric cloak

Valagiannopoulos, C., Alitalo, P., Tretyakov, S.,

**2014**In : IEEE Antennas and Wireless Propagation Letters. 13, p. 403-406Hyperbolic-metamaterial antennas for broadband enhancement of dipole emission to free space

Valagiannopoulos, C., Mirmoosa, M., Nefedov, I., Tretyakov, S., Simovski, C.,

**2014**In : Journal of Applied Physics. 116, 16,How nonreciprocal is an effective permittivity matrix?

Valagiannopoulos, C.,

**2014**In : Microwave and Optical Technology Letters. 56, 9, p. 2018-2021Emulating hyperbolic-media properties with conventional structures

Valagiannopoulos, C., Tretyakov, S.,

**2014**In : New Journal of Physics. 16,Low-pass features of optical nano-filters constituted by simple layered structures

Valagiannopoulos, C., Sihvola, A.,

**2013**In : Microwave and Optical Technology Letters. 55, 9, p. 2099-2106Increasing the electromagnetic attenuation below a quasi-matched surface with use of passive hyperbolic metamaterials

Valagiannopoulos, C., Nefedov, I.,

**2013**In : Photonics and Nanostructures - Fundamentals and Applications. 11, 3, p. 182-190Coupling between transmission-line networks and homogeneous media: A semianalytical approach

Valagiannopoulos, C., Alitalo, P.,

**2013**In : International Journal of RF and Microwave Computer-Aided Engineering. 23, 3, p. 318-327Electromagnetic absorption of gaussian beams by a grounded layered structure

Valagiannopoulos, C.,

**2013**In : Radioengineering. 22, 1, p. 333-340Isolating the singular term of the green's function in the vicinity of the corner formulated by two intersecting waveguides

Valagiannopoulos, C.,

**2013**In : Microwave and Optical Technology Letters. 55, 1, p. 16-23Total absorption in asymmetric hyperbolic media

Nefedov, I., Valagiannopoulos, C., Hashemi, S., Nefedov, E.,

**2013**In : Scientific Reports. 3,The effective radiation pattern concept for realistic performance estimation of LTE wireless systems

Zarbouti, D., Tsoulos, G., Athanasiadou, G., Valagiannopoulos, C.,

**2013**In : International Journal of Antennas and Propagation. 2013,Perfect absorption in graphene multilayers

Valagiannopoulos, C., Nefedov, I.,

**2013**In : Journal of Optics.Optimal directional pattern design utilizing arbitrary microphone arrays: A continuous-wave approach

Delikaris-Manias, S., Valagiannopoulos, C., Pulkki, V.,

**2013**134th Audio Engineering Society Convention 2013. p. 1-10On enhancing the field in the vicinity of a metamaterial wedge with use of an auxiliary dielectric tip

Valagiannopoulos, C., Sihvola, A.,

**2013**2013 7th European Conference on Antennas and Propagation, EuCAP 2013. p. 3452-3456Low interaction of an arbitrarily large PEC cylinder with em waves filtered through a layered structure

Valagiannopoulos, C.,

**2013**2013 7th European Conference on Antennas and Propagation, EuCAP 2013. p. 2238-2242Improving the electrostatic field concentration in a negative-permittivity wedge with a grounded "bowtie" configuration

Valagiannopoulos, C., Sihvola, A.,

**2013**In : Radio Science. 48, 3, p. 316-325Design and free-space measurements of a simple electromagnetic cloak for conducting cylindrical objects

Alitalo, P., Valagiannopoulos, C., Culhaoglu, A.,

**2013**In : AIP Advances. 3, 4,Concealing a perfectly conducting object with edges inside a dielectric superstrate

Valagiannopoulos, C., Tsitsas, N.,

**2013**Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013. p. 1269-1272Computationally efficient optimization of coupling tapers for transmission-line networks under obliquely incident illumination

Valagiannopoulos, C., Alitalo, P.,

**2013**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 420-421Approximating the mechanism of perfect electromagnetic boundaries by using magneto-dielectric materials

Valagiannopoulos, C., Sihvola, A.,

**2013**Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013. p. 1036-1039A miniature inhomogeneous cloak following a power law

Valagiannopoulos, C.,

**2013**In : International Journal of Applied Electromagnetics and Mechanics. 42, 1, p. 63-71A grating from coated PEC cylinders functioning as an electromagnetic absorber

Valagiannopoulos, C., Tretyakov, S.,

**2013**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 1986-1987On jamming unfriendly submarine communication by radiating across an island in the vicinity of the opponent's coastline

Valagiannopoulos, C.,

**2012**In : Electromagnetics. 32, 7, p. 438-449Demonstration of electromagnetic cloaking of conducting object by dielectric material cover

Alitalo, P., Valagiannopoulos, C.,

**2012**In : Electronics Letters. 48, 17, p. 1056-1057Electromagnetic cloaking of cylindrical objects by multilayer or uniform dielectric claddings

Valagiannopoulos, C., Alitalo, P.,

**2012**In : Physical Review B - Condensed Matter and Materials Physics. 85, 11,Implementation of the thin-wire approximation for estimating the characteristics of a metallic reinforcement bar embedded into a concrete column with circular cross section

Valagiannopoulos, C., Bimpas, M., Uzunoglu, N.,

**2012**In : Microwave and Optical Technology Letters. 54, 3, p. 761-767Convergence analysis and oscillations in the method of fictitious sources applied to dielectric scattering problems

Valagiannopoulos, C., Tsitsas, N., Fikioris, G.,

**2012**In : Journal of the Optical Society of America A: Optics and Image Science, and Vision. 29, 1, p. 1-10The influence of refractive index, excitation and observation on PEC/PMC boundary realization

Valagiannopoulos, C., Sihvola, A.,

**2012**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest).On modeling perfectly conducting sharp corners with magnetically inert dielectrics of extreme complex permittivities

Valagiannopoulos, C., Sihvola, A.,

**2012**In : IEEE Transactions on Antennas and Propagation. 60, 10, p. 4777-4784Integral equation analysis of a low-profile receiving planar microstrip antenna with a cloaking superstrate

Valagiannopoulos, C., Tsitsas, N.,

**2012**In : Radio Science. 47, 2,Field enhancement in a grounded dielectric slab by using a single superstrate layer

Valagiannopoulos, C., Tsitsas, N.,

**2012**In : Advances in OptoElectronics. 2012,Electromagnetic cloaking of PEC cylinders with a single isotropic and homogeneous layer

Valagiannopoulos, C., Alitalo, P.,

**2012**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest).Efficient evaluation of the Green's function for a bended coplanar waveguide

Valagiannopoulos, C.,

**2012**Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. p. 2191-2195Dielectric-coated PEC cylinders which do not scatter electromagnetic waves

Valagiannopoulos, C., Alitalo, P., Tretyakov, S.,

**2012**Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications, ICEAA'12. p. 90-91Concentrating the electromagnetic power in a grounded dielectric slab excited by an external Gaussian beam

Tsitsas, N., Valagiannopoulos, C.,

**2012**International Conference on Mathematical Methods in Electromagnetic Theory, MMET. p. 304-307Cloaking a microstrip antenna: Integral equation modeling

Valagiannopoulos, C., Tsitsas, N.,

**2012**Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications, ICEAA'12. p. 383-386An iterative semi-analytical technique solving the boundary value problem of transmission through an anisotropic wedge

Valagiannopoulos, C., Simovski, C.,

**2012**In : Radio Science. 47, 6,A Cartesian cloaking comprised of gradually sparser dielectric layers exploiting Snell's law

Valagiannopoulos, C.,

**2012**Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. p. 2688-2692Electromagnetic propagation into parallel-plate waveguide in the presence of a skew metallic surface

Valagiannopoulos, C.,

**2011**In : Electromagnetics. 31, 8, p. 593-605Simplified model for EM inverse scattering by longitudinal subterranean inhomogeneities exploiting the dawn/dusk ionospheric ridge

Valagiannopoulos, C., Uzunoglu, N.,

**2011**In : IET Microwaves, Antennas and Propagation. 5, 11, p. 1319-1327Simple cloak for antenna blockage reduction

Alitalo, P., Valagiannopoulos, C., Tretyakov, S.,

**2011**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 669-672On adjusting the characteristics of a low-index slab antenna with a finite set of metallic pins

Valagiannopoulos, C.,

**2011**Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. p. 913-917High selectivity and controllability of a parallel-plate component with a filled rectangular ridge

Valagiannopoulos, C.,

**2011**In : Progress in Electromagnetics Research. 119, p. 497-511Electromagnetic scattering of the field of a metamaterial slab antenna by an arbitrarily positioned cluster of metallic cylinders

Valagiannopoulos, C.,

**2011**In : Progress in Electromagnetics Research. 114, p. 51-66Conversion of evanescent waves into propagating modes by passing through a metamaterial prism: An iterative approximation method

Valagiannopoulos, C., Simovski, C.,

**2011**Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. p. 95-99Analytical model for coupling of waves between a homogeneous medium and a volumetric transmission-line network

Valagiannopoulos, C., Alitalo, P., Tretyakov, S.,

**2011**IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 2597-2600A new inverse formula based on the taylor expansion of the scattering integral

Valagiannopoulos, C.,

**2010**In : Electromagnetics. 30, 7, p. 565-573A novel methodology for estimating the permittivity of a specimen rod at low radio frequencies

Valagiannopoulos, C.,

**2010**In : Journal of Electromagnetic Waves and Applications. 24, 5-6, p. 631-640On developing alternating voltage around a rotating circular ring under plane wave excitation in the presence of an eccentri- cally positioned metallic core

Valagiannopoulos, C.,

**2010**In : Progress In Electromagnetics Research M. 12, p. 193-204Electromagnetic wave scattering by quasi-homogeneous obstacles

Tsitsas, N., Valagiannopoulos, C.,

**2010**Proceedings of the 9th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Engineering: Advanced Topics in Scattering and Biomedical Engineering. World Scientific Publishing Co. Pte Ltd, p. 169-176Convergence and oscillations in method-of-auxiliary-sources analyses of dielectric scattering problems

Valagiannopoulos, C., Tsitsas, N., Fikioris, G.,

**2010**Proceedings - 2010 12th International Conference on Electromagnetics in Advanced Applications, ICEAA'10. p. 665-668Linearization of the T-matrix solution for quasi-homogeneous scatterers

Valagiannopoulos, C., Tsitsas, N.,

**2009**In : Journal of the Optical Society of America A: Optics and Image Science, and Vision. 26, 4, p. 870-881Rigorous computation of green's function of a parallel-plate waveguide with a tapered wall

Valagiannopoulos, C., Uzunoglu, N.,

**2009**In : Electromagnetics. 29, 3, p. 203-219On smoothening the singular field developed in the vicinity of metallic edges

Valagiannopoulos, C.,

**2009**In : International Journal of Applied Electromagnetics and Mechanics. 31, 2, p. 67-77Green's function of a parallel plate waveguide with multiple abrupt changes of interwall distances

Valagiannopoulos, C., Uzunoglu, N.,

**2009**In : Radio Science. 44, 5,Analytic stochastic propagation model for urban streets

Karyotis, V., Valagiannopoulos, C.,

**2009**In : IET Microwaves, Antennas and Propagation. 4, 1, p. 91-98On the resonance and radiation characteristics of multi-layered spherical microstrip antennas

Valagiannopoulos, C., Tsitsas, N.,

**2008**In : Electromagnetics. 28, 4, p. 243-264On measuring the permittivity tensor of an anisotropic material from the transmission coefficients

Valagiannopoulos, C.,

**2008**In : Progress In Electromagnetics Research B. 9, p. 105-116On examining the influence of a thin dielectric strip posed across the diameter of a penetrable radiating cylinder

Valagiannopoulos, C.,

**2008**In : Progress In Electromagnetics Research C. 3, p. 203-214Electromagnetic scattering from two eccentric metamaterial cylinders with frequency-dependent permittivities differing slightly each other

Valagiannopoulos, C.,

**2008**In : Progress In Electromagnetics Research B. 3, p. 23-34A signal coverage model for two neighboring islands of different size

Valagiannopoulos, C.,

**2008**In : Progress In Electromagnetics Research M. 2, p. 115-130Stochastic ray propagation for two parallel urban streets: Exact and approximate results

Valagiannopoulos, C., Karyotis, V.,

**2008**In : IEEE Antennas and Wireless Propagation Letters. 7, p. 381-384Complex resonant frequencies of multi-layered spherical microstrip antennas

Valagiannopoulos, C., Tsitsas, N.,

**2008**Mathematical Methods in Electromagnetic Theory, MMET, Conference Proceedings. p. 213-215Closed-form solution to the scattering of a skew strip field by metallic pin in a slab

Valagiannopoulos, C.,

**2008**In : Progress in Electromagnetics Research. 79, p. 1-21Semi-analytic solution to a cylindrical microstrip with inhomogeneous substrate

Valagiannopoulos, C.,

**2007**In : Electromagnetics. 27, 8, p. 527-544Rigorous analysis of a metallic circular post in a rectangular waveguide with step discontinuity of sidewalls

Valagiannopoulos, C., Uzunoglu, N.,

**2007**In : IEEE Transactions on Microwave Theory and Techniques. 55, 8, p. 1673-1683Study of an electrically anisotropic cylinder excited magnetically by a straight strip line

Valagiannopoulos, C.,

**2007**In : Progress in Electromagnetics Research. 73, p. 297-325Single-series solution to the radiation of loop antenna in the presence of a conducting sphere

Valagiannopoulos, C.,

**2007**In : Progress in Electromagnetics Research. 71, p. 277-294Scattering of ELF waves by underground formations because of night-day ionospheric ridge

Valagiannopoulos, C., Uzunoglu, N.,

**2007**In : Radio Science. 42, 6,Effect of cylindrical scatterer with arbitrary curvature on the features of a metamaterial slab antenna

Valagiannopoulos, C.,

**2007**In : Progress in Electromagnetics Research. 71, p. 59-83Arbitrary currents on circular cylinder with inhomogeneous cladding and RCS optimization

Valagiannopoulos, C.,

**2007**In : Journal of Electromagnetic Waves and Applications. 21, 5, p. 665-680An overview of the watson transformation presented through a simple example

Valagiannopoulos, C.,

**2007**In : Progress in Electromagnetics Research. 75, p. 137-152Input admittances arising from explicit solutions to integral equations for infinite-length dipole antennas

Fikioris, G., Valagiannopoulos, C.,

**2005**In : Progress in Electromagnetics Research. 55, p. 285-306On choosing kernel and feed when analyzing dipole antennas via integral equations

Valagiannopoulos, C., Fikioris, G.,

**2004**Mathematical Methods in Electromagnetic Theory, MMET, Conference Proceedings. p. 257-259