4 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…
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…
Photonic time crystals assisted by quasi-bound states in the continuum
P. Garg, E. Almpanis, L. Zimmer +8
Photonic time crystals are a class of artificial materials that have only recently been explored. They are characterized by the ultrafast modulation of the material properties in t…
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…