A Plasmonic Chip-Scale Refractive Index Sensor Design Based on Multiple Fano Resonances

Sensors
Kunhua WenYihong Fang

Abstract

In this paper, multiple Fano resonances preferred in the refractive index sensing area are achieved based on sub-wavelength metal-insulator-metal (MIM) waveguides. Two slot cavities, which are placed between or above the MIM waveguides, can support the bright modes or the dark modes, respectively. Owing to the mode interferences, dual Fano resonances with obvious asymmetrical spectral responses are achieved. High sensitivity and high figure of merit are investigated by using the finite-difference time-domain (FDTD) method. In view of the development of chip-scale integrated photonics, two extra slot cavities are successively added to the structure, and consequently, three and four ultra-sharp Fano peaks with considerable performances are obtained, respectively. It is believed that this proposed structure can find important applications in the on-chip optical sensing and optical communication areas.

References

Aug 25, 2010·Nature Materials·Boris Luk'yanchukChong Tow Chong
Jul 5, 2017·Sensors·Xuefeng ZhaoShubin Yan

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Citations

Jan 11, 2020·Beilstein Journal of Nanotechnology·Lin ChengPengfei Cao
May 14, 2021·Applied Optics·Siavash PooretemadMehdi Aslinezhad

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Methods Mentioned

BETA
optical diffraction

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