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Ultrawide refractive-index measurement range fiber optic Fabry-Perot interferometer based on diamond

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posted on 2024-02-15, 07:30 authored by De-wen Duan, Yiyuan Xie, JianHao Yang, Yi Tang
The fiber optic Fabry-Perot interferometer (FPI) tip refractive index (RI) sensor is widely studied due to its simplicity, compactness, high spatial resolution, and relatively high accuracy. However, most Fabry-Perot interferometer tip refractive index sensors' cavities are silica optical fiber whose refractive index is approximately 1.45. This limits their applications in measuring the refractive index of many liquids whose RI is around 1.45. Here, we propose a fiber optic Fabry-Perot interferometer tip refractive index sensor that is fabricated by bonding a fat and thin diamond film on the apex of single-mode optical fiber. Its Fabry-Perot interferometer cavity is a diamond whose refractive index is ∼2.4 that offers such a sensor an ultrawide refractive measurement index range of 1 to over 2.2.

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Funder Name

Fundamental Research Funds for the Central Universities (SWU021004); Chongqing Municipal Science and Technology Bureau (sl202100000172)

Preprint ID

111822

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