一种非线性腔光力系统中的光机械频梳现象  

Observation of Optomechanical Frequency Comb in a Nonlinear Cavity Optomechanical System

作　　者：熊水东[1] 夏霁 王付印 侯庆凯 陈虎 姚琼[1] 曹春燕[1] Xiong Shuidong;Xia Ji;Wang Fuyin;Hou Qingkai;Chen Hu;Yao Qiong;Cao Chunyan(College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学气象海洋学院,湖南长沙410073

出　　处：《光学学报》2023年第17期242-251,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61905283)。

摘　　要：腔光力系统是一种光学谐振模式和机械振荡模式在微纳尺度上相互耦合作用的微纳腔体结构。基于微纳加工技术实现的腔光力结构具有超强光机械模式耦合效应,可在激光激励下产生超稳且窄线宽的机械振荡信号。腔光力系统中的经典力学、量子力学现象等已经被广泛应用于高精度传感、腔光力器件与电路、高效率微波-光学转换器件等技术领域。为了获得光机械振荡微波信号,采用基于非线性机械振子的光机械耦合方案,使腔光力作用在一个含有非线性振子的两级级联的机械振子系统上,实现由非线性特性光机械耦合作用引起的简并四波混频,进而产生光机械频梳。基于非线性腔光力系统的光机械频梳研究,将有效推动光子集成式光机械频梳技术的发展和广泛应用。Objective Cavity optomechanical system enables a hybrid system where optical resonant mode and mechanical oscillation mode are coupled together.Benefiting from the compatibility of the manufacturing process with the semiconductor industry,a strong optomechanical interaction between the optical cavity and mechanical resonator can be achieved in nanoscale silicon photonics devices.The nanoscale optomechanical system can considerably improve the interaction between optics and mechanics mediated by the optical force,enabling the development of ultra-stable and ultra-narrow linewidth mechanical oscillation signals.Cavity optomechanics research on classical mechanics and quantum systems has been widely utilized to provide an unprecedented platform for high-precision sensing,cavity optomechanical devices and circuits,and high-efficiency microwave-optical conversion devices.We propose a nonlinear cavity optomechanical coupling scheme by introducing a nonlinear mechanical oscillator integrated with a linear mechanical oscillator to achieve the high-performance optomechanical frequency comb.This novel nonlinear optomechanical system can provide a solution for the high-performance cavity optomechanical frequency comb and hence effectively promote the development and application of photonic microwave source technology.Methods A nonlinear mechanical oscillator integrated with a linear mechanical oscillator is introduced into an optomechanical system,and the optomechanical frequency comb is experimentally observed with a series of equally spaced and discrete frequencies.In this optomechanical system,a zipper cavity consists of two photonic crystal nanobeam(PCN)cavities.One PCN is doubly clamped to work as a fixed PCN for laser pumping,and the other movable PCN is integrated with a 2-degree-of-freedom(2-DOF)vibration system to transform the optical force acting on two mechanical oscillator.In the 2-DOF oscillator system,a curved nonlinear mechanical oscillator is integrated with a linear mechanical oscillator.Based on the degen

关 键 词：光声作用 腔光力系统 非线性振子 光机械频梳 

分 类 号：O426.3[理学—声学]