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Article

Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles

1
Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE1410, Brunei
2
Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, Taiwan
3
Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu 300, Taiwan
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(10), 2030; https://doi.org/10.3390/nano10102030
Received: 5 September 2020 / Revised: 1 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Nanobiophotonics, Photomedicine, and Imaging)
A plasmonic metal-insulator-metal waveguide filter consisting of one rectangular cavity and three silver baffles is numerically investigated using the finite element method and theoretically described by the cavity resonance mode theory. The proposed structure shows a simple shape with a small number of structural parameters that can function as a plasmonic sensor with a filter property, high sensitivity and figure of merit, and wide bandgap. Simulation results demonstrate that a cavity with three silver baffles could significantly affect the resonance condition and remarkably enhance the sensor performance compared to its counterpart without baffles. The calculated sensitivity (S) and figure of merit (FOM) in the first mode can reach 3300.00 nm/RIU and 170.00 RIU−1. Besides, S and FOM values can simultaneously get above 2000.00 nm/RIU and 110.00 RIU−1 in the first and second modes by varying a broad range of the structural parameters, which are not attainable in the reported literature. The proposed structure can realize multiple modes operating in a wide wavelength range, which may have potential applications in the on-chip plasmonic sensor, filter, and other optical integrated circuits. View Full-Text
Keywords: metal-insulator-metal; waveguide; rectangular cavity; silver baffles; finite element method metal-insulator-metal; waveguide; rectangular cavity; silver baffles; finite element method
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MDPI and ACS Style

Chou Chau, Y.-F.; Chou Chao, C.-T.; Huang, H.J.; Kooh, M.R.R.; Kumara, N.T.R.N.; Lim, C.M.; Chiang, H.-P. Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles. Nanomaterials 2020, 10, 2030. https://doi.org/10.3390/nano10102030

AMA Style

Chou Chau Y-F, Chou Chao C-T, Huang HJ, Kooh MRR, Kumara NTRN, Lim CM, Chiang H-P. Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles. Nanomaterials. 2020; 10(10):2030. https://doi.org/10.3390/nano10102030

Chicago/Turabian Style

Chou Chau, Yuan-Fong, Chung-Ting Chou Chao, Hung J. Huang, Muhammad R.R. Kooh, Narayana T.R.N. Kumara, Chee M. Lim, and Hai-Pang Chiang. 2020. "Ultrawide Bandgap and High Sensitivity of a Plasmonic Metal-Insulator-Metal Waveguide Filter with Cavity and Baffles" Nanomaterials 10, no. 10: 2030. https://doi.org/10.3390/nano10102030

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