Spontaneous Emission Decay and Excitation in Photonic Time Crystals by Jagang Park instant download

Spontaneous Emission Decay and Excitation in Photonic Time Crystals by Jagang Park instant download

Over the last few decades, the predominant strategies for controlling spontaneous emission have involvedtailoring the spatial surroundings of quantum emitters or atoms to create resonant or spatially periodicphotonic structures. However, the rise of time-varying photonics has prompted a reevaluation of spontaneousemission in dynamically changing environments, especially within photonic time crystals, where opticalproperties undergo time-periodic modulation. Here, we apply classical light-matter interaction theorytogether with Floquet analysis to reveal a substantial enhancement of the spontaneous emission decay rate atthe momentum gap frequency in photonic time crystals. Moreover, our findings suggest that photonic timecrystals enable a nonequilibrium light-matter interaction process: the spontaneous excitation of an atom fromits ground state to an excited state, accompanied by the concurrent emission of a photon, referred to asspontaneous emission excitation.DOI: 10.1103/5v2w-yg7v