30 citations · 31 across the 8 of their papers we have counts for
9 papers
Perturbative Born theory for light scattering by time-modulated scatterers
Dionysios Galanis, Evangelos Almpanis, Nikolaos Papanikolaou +1
We present a theoretical framework for electromagnetic scattering by particles with a permittivity that is periodically varying in time, based on a perturbative approach. Within th…
Photonic time crystals assisted by quasi-bound states in the continuum
P. Garg, E. Almpanis, L. Zimmer +8
Photonic time crystals (PTCs) are characterized by the rapid modulation of the material properties in time, causing a momentum bandgap for light. However, the observation of these…
Axion-mediated photon-to-photon transitions in high finesse dielectric resonators
Evangelos Almpanis
Axions are hypothetical particles that could address both the strong charge-parity problem in quantum chromodynamics and the enigmatic nature of dark matter. However, if axions exi…
Electromagnetic Multipole Theory for Two-dimensional Photonics
Iridanos Loulas, Evangelos Almpanis, Minas Kouroublakis +3
We develop a full-wave electromagnetic (EM) theory for calculating the multipole decomposition in two-dimensional (2-D) structures consisting of isolated, arbitrarily shaped, inhom…
Anisotropic Virtual Gain and Large Tuning of Particles' Scattering by Complex-Frequency Excitations
Grigorios P. Zouros, Iridanos Loulas, Evangelos Almpanis +2
Active tuning of the scattering of particles and metasurfaces is a highly sought-after property for a host of electromagnetic and photonic applications, but it normally requires ch…
Highly Directional Scattering of Terahertz Radiation by Cylinders using Complex-Frequency Waves
Iridanos Loulas, Grigorios P. Zouros, Evangelos Almpanis +1
In this study we investigate the directional scattering of terahertz radiation by dielectric cylinders, focusing on the enhancement of directionality using incident radiation of co…