4 papers
Revealing non-Hermitian band structures of photonic Floquet media
Jagang Park, Hyukjoon Cho, Seojoo Lee +7
Periodically driven systems, characterised by their inherent non-equilibrium dynamics, are ubiquitously found in both classical and quantum regimes. In the field of photonics, thes…
Resonance-enhanced spectral funneling in Fabry-Perot resonators with a temporal boundary mirror
Kanghee Lee, Junho Park, Seojoo Lee +4
A temporal boundary refers to a specific time at which the properties of an optical medium are abruptly changed. When light interacts with the temporal boundary, its spectral conte…
Observation of an exceptional point in a non-Hermitian metasurface
Sang Hyun Park, Sung-Gyu Lee, Taewoo Ha +6
Exceptional points, also known as non-Hermitian degeneracies, have been observed in parity-time symmetric metasurfaces as the parity-time symmetry breaking point. However, the pari…
Linear frequency conversion via sudden merging of resonances in time-variant metasurfaces
Kanghee Lee, Jaehyeon Son, Jagang Park +4
Energy conversion in a physical system requires time-translation invariance breaking according to Noether's theorem. Closely associated with this symmetry-conservation relation, th…