Presentation Information
[10p-F212-14]Spectral design principles for local-excitation retention in two-level atomic arrays
〇Junpei Oba1 (1.TCRDL)
Keywords:
atomic array,cooperative emission,non-hermitian
We numerically study local-excitation retention in two-level atomic arrays with cooperative radiation. Using the eigenmode decomposition of an effective non-Hermitian Hamiltonian, we show that long-lived retention is favored when the initial state overlaps mainly with a single weakly decaying eigenmode. We also find that multiple long-lived modes with similar weights can cause oscillatory dynamics. Based on these results, we introduce a spectral objective function using eigenstate weights and decay rates, and optimize atomic configurations under minimum-distance constraints. The optimized nonperiodic structure improves excitation retention and suppresses far-field radiation.