Design Rule of Mach-Zehnder Interferometer Sensors for Ultra-High Sensitivity

被引：31
作者：
Xie, Yiwei [1 ,2 ]
Zhang, Ming [1 ,2 ]
Dai, Daoxin [1 ,2 ]
机构：
[1] Zhejiang Univ, Int Res Ctr Adv Photon, State Key Lab Modern Opt Instrumentat, Coll Opt Sci & Engn,Ctr Opt & Electromagnet Res, Zijingang Campus, Hangzhou 310058, Peoples R China
[2] Zhejiang Univ, Ningbo Res Inst, Ningbo 315100, Peoples R China
来源：
SENSORS | 2020年 / 20卷 / 09期
基金：
中国国家自然科学基金;
关键词：
integrated optics; polarization-selective devices; Mach-Zehnder interferometer sensor; OPTICAL SENSOR; WAVE-GUIDE; ENHANCED SENSITIVITY; LABEL-FREE; RESONATORS;
D O I：
10.3390/s20092640
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A design rule for a Mach-Zehnder interferometer (MZI) sensor is presented, allowing tunable sensitivity by appropriately choosing the MZI arm lengths according to the formula given in this paper. The present MZI sensor designed by this method can achieve an ultra-high sensitivity, which is much higher than any other traditional MZI sensors. An example is given with silicon-on-insulator (SOI) nanowires and the device sensitivity is as high as 10(6) nm/refractive-index -unit (or even higher), by choosing the MZI arms appropriately. This makes it possible for one to realize a low-cost optical sensing system with a detection limit as high as 10(-6) refractive-index-unit, even when a cheap optical spectrum analyzer with low-resolution (e.g., 1 nm) is used for the wavelength-shift measurement.
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页数：8
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