Highly sensitive optical sensor based on two cascaded micro-ring resonators with an LED light source

Lei Jin; Mingyu Li; Jian-Jun He

doi:10.1117/12.872831

17 January 2011 Highly sensitive optical sensor based on two cascaded micro-ring resonators with an LED light source

Lei Jin, Mingyu Li, Jian-Jun He

Proceedings Volume 7943, Silicon Photonics VI; 794307 (2011) https://doi.org/10.1117/12.872831
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

A highly-sensitive and low-cost optical sensor that requires only power measurement is proposed and investigated. It consists of two cascaded micro-ring resonators with slightly different optical path lengths, used in conjunction with an LED light source. The transmission spectrum of the sensor has a series of peaks with a sinusoidal-like envelope function. The variation of the refractive index of the analyte sample results in an amplified shift in the transmission envelope function, and consequently a change in the transmitted LED power. It is shown that a refractive index variation in the order of 7.0×10^-7 can be detected without any spectral measurement. Preliminary experimental results using a broadband light source are presented.

Citation Download Citation

Lei Jin, Mingyu Li, and Jian-Jun He "Highly sensitive optical sensor based on two cascaded micro-ring resonators with an LED light source", Proc. SPIE 7943, Silicon Photonics VI, 794307 (17 January 2011); https://doi.org/10.1117/12.872831

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