TY - JOUR
TI - Optical Transitions and Nonreciprocity in Spatio-Temporally Periodic Layers of Spherical Particles
AU - Panagiotidis, E.
AU - Almpanis, E.
AU - Papanikolaou, N.
AU - Stefanou, N.
JO - Advanced Optical Materials
PY - 2023
VL - null
TODO - null
SP - null
PB - John Wiley and Sons Inc
SN - 2195-1071
TODO - 10.1002/adom.202202812
TODO - Crystals;  Inelastic scattering;  Multiple scattering;  Optical lattices;  Spheres, Floquet;  Metasurface;  Multiple scattering method;  Nonreciprocal;  Nonreciprocal optical response;  Optical response;  Space-time floquet crystal;  Spacetime;  Time varying;  Time-varying metasurface, Refractive index
TODO - An extension of the photonic layer multiple scattering methodology to dynamic spherical scatterers, which exhibit a periodic time-varying response, is presented. The applicability of the method is demonstrated on specific examples of single- and bi-layers of periodically modulated high-refractive-index spherical particles arranged on a square lattice. The results provide compelling evidence for strong and tunable inelastic scattering effects under the triple resonance condition, fulfilled for optical transitions between neighboring high-Q lattice modes of the appropriate symmetry, which originate from multipolar Mie resonances. A consistent interpretation of the underlying mechanisms is provided and potential applications in the design of nonreciprocal devices are discussed. © 2023 Wiley-VCH GmbH.
ER -