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Article

Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods

1
Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE1410, Brunei Darussalam
3
Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu 300, Taiwan
4
Institute of Physics, Academia Sinica, Taipei 115, Taiwan
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1399; https://doi.org/10.3390/nano10071399
Received: 3 July 2020 / Revised: 15 July 2020 / Accepted: 16 July 2020 / Published: 18 July 2020
(This article belongs to the Special Issue Nanobiophotonics, Photomedicine, and Imaging)
We numerically and theoretically investigate a highly sensitive and tunable plasmonic refractive index sensor that is composed of a metal-insulator-metal waveguide with a side-coupled nanoring, containing silver nanorods using the finite element method. Results reveal that the presence of silver nanorods in the nanoring has a significant impact on sensitivity and tunability performance. It gives a flexible way to tune the system response in the proposed structure. Our designed sensor has a sensitivity of 2080 nm/RIU (RIU is the refractive index unit) along with a figure of merit and a quality factor of 29.92 and 29.67, respectively. The adequate refractive index sensitivity can increase by adding the silver nanorods in a nanoring, which can induce new surface plasmon polaritons (SPPs) modes that cannot be found by a regular nanoring. For a practical application, a valid introduction of silver nanorods in the nanoring can dramatically reduce the dimension of the proposed structure without sacrificing performance. View Full-Text
Keywords: plasmonic refractive index sensor; metal-insulator-metal waveguide; figure of merit; sensitivity; nanoring plasmonic refractive index sensor; metal-insulator-metal waveguide; figure of merit; sensitivity; nanoring
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MDPI and ACS Style

Chou Chao, C.-T.; Chou Chau, Y.-F.; Huang, H.J.; Kumara, N.T.R.N.; Kooh, M.R.R.; Lim, C.M.; Chiang, H.-P. Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods. Nanomaterials 2020, 10, 1399. https://doi.org/10.3390/nano10071399

AMA Style

Chou Chao C-T, Chou Chau Y-F, Huang HJ, Kumara NTRN, Kooh MRR, Lim CM, Chiang H-P. Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods. Nanomaterials. 2020; 10(7):1399. https://doi.org/10.3390/nano10071399

Chicago/Turabian Style

Chou Chao, Chung-Ting; Chou Chau, Yuan-Fong; Huang, Hung J.; Kumara, N. T.R.N.; Kooh, Muhammad R.R.; Lim, Chee M.; Chiang, Hai-Pang. 2020. "Highly Sensitive and Tunable Plasmonic Sensor Based on a Nanoring Resonator with Silver Nanorods" Nanomaterials 10, no. 7: 1399. https://doi.org/10.3390/nano10071399

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