Compact and Highly Sensitive Refractive Index Sensor Based on Embedded Double-Ring Resonator Using Vernier Effect

• Published in: IEEE photonics journal Vol. 15; no. 1; pp. 1 - 9
• Main Authors: Ma, Xiao Xia, Zhao, Zhi Ying, Yao, Hao, Deng, Jia Yao, Wu, Jie Yun, Hu, Zhe Feng, Chen, Kai Xin
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.02.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Aqueous solutions; composite waveguide; Electromagnetic waveguides; embedded double-ring; liquid refractive index sensor; Liquid waveguides; Optical interferometry; Optical ring resonators; Optical waveguide; Optical waveguides; Polymers; Refractivity; Resonators; Sensitivity; Vernier effect
• ISSN: 1943-0655; 1943-0655; 1943-0647
• DOI: 10.1109/JPHOT.2022.3231935

A compact and highly sensitive liquid refractive index (RI) sensor using Vernier effect achieved with embedded double-ring resonator is proposed and demonstrated. Unlike these conventional sensors using cascaded double-ring resonators to achieve Vernier effect, in our proposed embedded double-ring sensor (EDRS) the sensing ring is embedded on the reference ring, which makes the sensor more compact while achieving high sensitivity. Our typical fabricated EDRS with polymer material, which has a footprint of 1500 μm × 850 μm, achieves the RI sensitivity as high as 7390 nm/RIU in aqueous medium, which is in excellent agreement with the theoretical one.