Observation of mechanical bound states in the continuum in an optomechanical microresonator  

作　　者：Yue Yu Xiang Xi Xiankai Sun 

机构地区：[1]Department of Electronic Engineering,The Chinese University of Hong Kong,Shatin,New Territories,Hong Kong SAR,China

出　　处：《Light(Science & Applications)》2022年第12期2931-2938,共8页光（科学与应用)（英文版）

基　　金：supported by the Research Grants Council of Hong Kong(Project Nos.14208717 and 14208421).

摘　　要：Bound states in the continuum(BICs)are a type of waves that are perfectly confined in the continuous spectrum of radiating waves without interaction with them.Here,we fabricated,with CMOS-compatible processes on a silicon chip,a wheel-shaped optomechanical microresonator,in which we experimentally observed the BIC in the micromechanical domain.The BIC results from destructive interference between two dissipative mechanical modes of the microresonator under broken azimuthal symmetry.Such BICs can be obtained from devices with large and robust supporting structures with variable sizes,which substantially reduces fabrication difficulty and allows for versatile application environments.Our results open a new way of phonon trapping in micromechanical structures with dissipation channels,and produce long phonon lifetimes that are desired in many mechanical applications such as mechanical oscillators,sensors,and quantum information processors.

关 键 词：PHONON CONTINUUM STATES 

分 类 号：O43[机械工程—光学工程]