Refractive index sensor based on multilayer semicircular slot structure

Tong Wu; Yang Gao; Ya-chen Gao

doi:10.1117/12.2547726

18 December 2019 Refractive index sensor based on multilayer semicircular slot structure

Tong Wu, Yang Gao, Ya-chen Gao

Proceedings Volume 11336, AOPC 2019: Nanophotonics; 113360K (2019) https://doi.org/10.1117/12.2547726
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

A plasmonic sensor which can detect the refractive index and the polarization of incident light is proposed. The sensor is based on a gold composite structure constructed from a gold film which was etched a plurality of circular arc-shaped slits. The transmission spectra of the composite structure are theoretically studied using the finite-difference time-domain method (FDTD), and the influence of structure parameters on the transmission spectra are also studied. Moreover, it was found that the transmission spectra of are sensitive to environment refractive index, which can be used to detect refractive index. Specifically, the sensitivity of 550 nm/RIU was obtained after optimizing the structure parameters. Due to the asymmetry of the sensor structure, this design can also detect the polarization direction of light.

Citation Download Citation

Tong Wu, Yang Gao, and Ya-chen Gao "Refractive index sensor based on multilayer semicircular slot structure", Proc. SPIE 11336, AOPC 2019: Nanophotonics, 113360K (18 December 2019); https://doi.org/10.1117/12.2547726

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