Open AccessFemtogram scale high frequency nano-optomechanical resonators in water
Author(s) -
He Zhang,
Xiangjie Zhao,
Yi Wang,
Qingzhong Huang,
Jinsong Xia
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.000821
Subject(s) - resonator , resonance (particle physics) , mechanical resonance , materials science , optics , q factor , sensitivity (control systems) , inertia , noise (video) , dissipation , finite element method , optoelectronics , vibration , acoustics , physics , atomic physics , image (mathematics) , classical mechanics , electronic engineering , artificial intelligence , computer science , engineering , thermodynamics
A femtogram scale nanobeam optomechanical crystal (OMC) resonator operating in water is designed and demonstrated. After immersing the device in water, the mechanical Q-factor reduces to 6.6 from 2285 in air. The thermomechanical motion of the highly damped mechanical resonance in water can be resolved using the sensitive cavity optomechanical readout. The mechanical frequency is shifted to 5.251 GHz from 5.3 GHz in air due to the added motional inertia. From the thermomechanical noise spectrum of the mechanical resonance, a noise floor of 9.33am/Hz is achieved in water. Through 2D finite element method (FEM) simulations, the acoustic dissipation dominates the low mechanical Q-factor of the device during the interaction between the mechanical resonance and surrounding water. The mass sensitivity of the present device is estimated to be 1.33ag/Hz in water.