Photonic Sensors, Volume. 12, Issue 2, 175(2022)
A Plasmonic Refractive-Index Sensor Based Multiple Fano Resonance Multiplexing in Slot-Cavity Resonant System
In this paper, a sub-wavelength metal-insulator-metal (MIM) waveguide structure is proposed by using a cross-shape rectangular cavity, of which wings are coupled with two rectangular cavities. Firstly, a cross-shape rectangular cavity is placed between the input and output MIM waveguides. According to the mutual interference between bright and dark modes, three Fano resonant peaks are generated. Secondly, by adding a rectangular cavity on the left wing of the cross shaped one, five asymmetric Fano resonance peaks are obtained. Thirdly, six asymmetric Fano resonance peaks are achieved after adding another cavity on the right wing. Finally, the finite-difference-time-domain (FDTD) method and multimode interference coupled-mode theory (MICMT) are used to simulate and analyze the coupled plasmonic resonant system, respectively. The highest sensitivity of 1 000 nm/RIU is achieved.
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Zicong GUO, Kunhua WEN, Yuwen QIN, Yihong FANG, Zhengfeng LI, Li CHEN. A Plasmonic Refractive-Index Sensor Based Multiple Fano Resonance Multiplexing in Slot-Cavity Resonant System[J]. Photonic Sensors, 2022, 12(2): 175
Category: Regular
Received: Nov. 4, 2020
Accepted: Mar. 1, 2021
Published Online: Jan. 10, 2022
The Author Email: GUO Zicong (2111915043@mail2.gdut.edu.cn)