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Multiple-Mode Bowtie Cavities for Refractive Index and Glucose Sensors Working in Visible and Near-infrared Wavelength Ranges

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Abstract

A multiple-mode metal-insulator-metal plasmonic sensor with four coupled bowtie resonators containing two pairs of silver baffles is numerically investigated using the finite element method and verified by the temporal coupled mode theory. The proposed structure can function as a plasmonic refractive index and glucose sensors working in visible and near-infrared wavelength ranges. Simulation results show that introducing the silver baffles in bowtie cavities can modify the plasmon resonance modes and give a tunable way to enhance the sensitivity and figure of merit. The highest sensitivity (S) can reach S = 1500.00, 1400.00, and 1100.00 nm/RIU and the high figure of merit (FOM) of 50.00, 46.67, and 36.67 RIU−1 from mode 1 to mode 3. The sensitivity obtained from three modes with operating wavelengths in visible and near-infrared simultaneously exceeds 1100.00 nm/RIU along with remarkably high FOM, which are not attainable from other reported literature. The proposed structure can realize multi-mode and shows impressive practical prospects that can be applied for integrated optics circuits (IOCs) and other nanophotonics devices.

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Funding

This research was supported by the University Research Grant of Universiti Brunei Darussalam (Grant No. UBD/RSCH/1.9/FICBF(b)/2019/006).

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  1. Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong, BE1410, Negara Brunei Darussalam

    Yuan-Fong Chou Chau

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Chou Chau, YF. Multiple-Mode Bowtie Cavities for Refractive Index and Glucose Sensors Working in Visible and Near-infrared Wavelength Ranges. Plasmonics 16, 1633–1644 (2021). https://doi.org/10.1007/s11468-021-01431-8

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