Phonon-phonon interaction and parametric down-conversion generation in multimode optomechanical systems  

作　　者：Zhen-Yang Peng Ying-Dan Wang 

机构地区：[1]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Communications in Theoretical Physics》2023年第3期20-28,共9页理论物理通讯（英文版）

基　　金：support from the NSFC(Grant No.12275331);the Penghuanwu Innovative Research Center(Grant No.12047503);the Innovation Program for Quantum Science and Technology(Grant No.2021ZD031602)。

摘　　要：We studied the process of polariton conversion in a 3-mode nonlinear optomechanical system.Compared with the standard 2-mode optomechanical system,we find a much larger conversion rate of polariton modes can be achieved under typical dissipation conditions.To obtain a transparent understanding of the relevant physical process,we show that in the large detuned case,the cavity can be eliminated adiabatically,resulting in a parametric down-conversion(PDC)interaction between two phononic polariton modes.By tuning cavity detuning,the nonlinear interaction can be enhanced with the frequency-matching condition.Results from analytical treatment based on the effective PDC model agree with the numerical simulation.Such a system provides potential applications in nonlinear phononics.

关 键 词：nonlinear optomechanical system parametric down-conversion adiabatic elimination 

分 类 号：O413[理学—理论物理]