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PhotonIcs and Electromagnetics Research Symposium,
also known as Progress In Electromagnetics Research Symposium

PIERS Proceedings

Published by The Electromagnetics Academy

Published: 2015-08-28

High-performance Microcavity Optical Sensor Connected with a Waveguide

By

Qinghai Song,

Qinghai Song

Harbin Institute of Technology, China

Shumin Xiao,

Shumin Xiao

Harbin Institute of Technology, China

Zhiyuan Gu,

Zhiyuan Gu

Harbin Institute of Technology, China

Shuai Liu,

Shuai Liu

Harbin Institute of Technology, China

Nan Zhang

Nan Zhang

Harbin Institute of Technology, China

Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)818-821

Abstract

In this letter, we have numerically demonstrated a high-performance microcavity sensor which is connected with a waveguide directly. With input light and output light transmit- ting in the same waveguide, we propose a robust direct coupling mechanism of the microcavity. For a circular microcavity with a diameter of 4 µm and effective refractive index of 3.3, our nu- merical results show that the coupled modes are excited and more than 106 Q-factor is calculated from the transmission spectrum. Dramatically, the spectrum shows a Fano-shape resonance at specific wavelength. Using the Fano resonance, we detected a refractive index change on the order 10−5 and a nanoparticle with radius 5 nm. What’s more, the sensor is insensitive to waveguide width and refractive index.

Citation

Qinghai Song, Shumin Xiao, Zhiyuan Gu, Shuai Liu, and Nan Zhang, "High-performance Microcavity Optical Sensor Connected with a Waveguide," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)818-821

References

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