A Proposal to Enhance High-Frequency Optical MEMS Accelerometer Sensitivity Based on a One-Dimensional Photonic Crystal Wavelength Modulation System
Yunlong Nie, Kun Huang, Jiapeng Yang, Liqin Cao, Lin Cheng, Qi Wang, Haibo Tian, Wangyang Peihua, Liang Heng
Abstract
In this article, a novel optical microelectromechanical systems (MEMS) accelerometer sensor based on a one-dimensional photonic crystals wavelength modulation system is proposed with a focus on optimizing the sensitivity of the high-frequency device. The proposed accelerometer consists of a sensitive optical system and a high-frequency mechanical structure, which have been studied by rigorous coupled wave analysis (RCWA) and finite element analysis (FEA). A very large bandwidth, excellent sensitivity to optical sensing and considerable resolution of the high-frequency device of the proposed sensor provide several attractive performance aspects. Through a rigorous theoretical argument, the following results are demonstrated: a photonic band gap (PBG) from 1.1 to 2.8 $\mu $ m, a bandwidth from 0 to 20 kHz, an optical system sensitivity of to 3.38, and an accelerometer sensitivity of 2.06 nm/g, with a measurement range of ± 217 g and a resolution of 4.850 mg. In view of these optimized performances, the proposed MEMS accelerometer can be used for all kinds of high frequency applications.