论文题目：Tunable optical second-order sideband effects in a parity-time symmetric optomechanical system

论文类型：Article

第一作者：廖庆洪

通讯作者：廖庆洪

参与作者：Xiao, X (Xiao, Xing) [1] ; Liao, QH (Liao, QingHong) ; Zhou, NR (Zhou, NanRun) ; Nie, WJ (Nie, WenJie) ; Liu, YC (Liu, YongChun)

发表期刊名称：Science China-Physics Mechanics & Astronomy

期刊分区（SCI为中科院分区）：中科院1区Top, JCR 1区

影响因子：5.122

发表日期：2020.5.19

卷、期、页：卷63 期11

ISSN号：1674-7348

关键字：second-order sideband effectsparity-time symmetryoptomechanical system4265Ky4250Gy4270Mp4282Fv

摘要：We theoretically investigate the optical second-order sideband generation (OSSG) in an optical parity-time (PT) symmetric system, which consists of a passive cavity trapping the atomic ensemble and an active cavity. Compared with the double-passive system, it is found that near the exceptional point (EP), the efficiency of the OSSG increases sharply not only for the blue probepump detuning resonant case but also for the red one. Using experimentally achievable parameters, we study the effect of the atomic ensemble on the efficiency of the OSSG in the PT-symmetric system. The numerical results show that the efficiency of the OSSG is 30% higher than that of the first-order sideband, which is realized easily by simultaneously modulating the atom-cavity coupling strength and detuning. Moreover, the efficiency of the OSSG can also be tuned effectively by the pump power, and the efficiency is robust when the pump power is strong enough. This study may have some guidance for modulating the nonlinear optical properties and controlling light propagation, which may stimulate further applications in optical communications.