Analogs of Spontaneous Emission and Lasing in Photonic Time Crystals

Author(s): Kyungmin Lee, Minwook Kyung, Yung Kim, Jagang Park, Hansuek Lee, Joonhee Choi, C. T. Chan, Jonghwa Shin, Kun Woo Kim, and Bumki Min We report the first direct mapping of the frequency-resolved local density of states (LDOS) in a photonic time crystal (PTC) implemented as an array of time-periodically modulated LC resonators at microwave frequencies. Broadband white noise probes the system and yields an LDOS line shape near the m… [Phys. Rev. Lett. 136, 093802] Published Tue Mar 03, 2026