177 citations · 351 across the 12 of their papers we have counts for
12 papers
A general framework for the study of electrostatic point charges in multilayer planar structures
George Fikioris, Theodoros T. Koutserimpas, Elias N. Glytsis
We develop a general framework for the electrostatic analysis of point charges in multilayer planar structures with arbitrary layer thicknesses and material parameters. Starting fr…
Wake-Tail Effects in Two-Dimensional Wave Refocusing
Theodoros T. Koutserimpas
In even spatial dimensions, solutions of the wave equation violate Huygens' principle, producing a persistent wake tail inside the light cone rather than a sharply localized propag…
Exploring the equivalence of causality-based and quantum mechanics-based sum rules for harmonic generation in nonlinear optical materials
Theodoros T. Koutserimpas, Hao Li, Owen D. Miller +1
The Kramers-Kronig relations and various oscillator strength sum rules represent strong constraints on the physical response of materials. In this work, taking inspiration from the…
Approaching upper bounds to resonant nonlinear optical susceptibilities with inverse-designed quantum wells
Hao Li, Theodoros T. Koutserimpas, Francesco Monticone +1
We develop a unified framework for identifying bounds to maximum resonant nonlinear optical susceptibilities, and for "inverse designing" quantum-well structures that can approach…
Light propagation in time-periodic bi-isotropic media
Stefanos Fr. Koufidis, Theodoros T. Koutserimpas, Francesco Monticone +1
Photonic structures and time-crystals, wherein time is incorporated as an additional degree of freedom for light manipulation, have necessitated the development of analytical and s…
Electromagnetic fields between moving mirrors: Singular waveforms inside Doppler cavities
Theodoros T. Koutserimpas, Constantinos Valagiannopoulos
Phenomena of wave propagation in dynamically varying structures have reemerged as the temporal variations of the medium's properties can extend the possibilities for electromagneti…
Electromagnetic fields in a time-varying medium: Exceptional points and operator symmetries
Theodoros T. Koutserimpas, Romain Fleury
In this paper, we study the interactions of electromagnetic waves with a non-dispersive dynamic medium that is temporally dependent. Electromagnetic fields under material time-modu…
Dipole polarizability of time-varying particles
M. S. Mirmoosa, T. T. Koutserimpas, G. A. Ptitcyn +2
Invariance under time translation (or stationarity) is probably one of the most important assumptions made when investigating electromagnetic phenomena. Breaking this assumption is…
Coupled-Mode Theory for Stationary and Nonstationary Resonant Sound Propagation
Theodoros T. Koutserimpas, Romain Fleury
We present a complete analytical derivation of the equations used for stationary and nonstationary wave systems regarding resonant sound transmission and reflection described by th…
Parametric amplification and bidirectional invisibility in PT-symmetric time-Floquet systems
Theodoros T. Koutserimpas, Andrea Alu, Romain Fleury
Parity-Time (PT) symmetric wave devices, which exploit balanced interactions between material gain and loss, exhibit extraordinary properties, including lasing and flux-conserving…
Zero refractive index in space-time acoustic metamaterials
Theodoros Koutserimpas, Romain Fleury
New scientific investigations of artificially structured materials and experiments have exhibit wave manipulation to the extreme. In particular, zero refractive index metamaterials…
Non-Reciprocal gain in non-Hermitian time-Floquet Systems
Theodoros T. Koutserimpas, Romain Fleury
We explore the unconventional wave scattering properties of non-Hermitian systems in which amplification or damping are induced by time-periodic modulation. These non- Hermitian ti…