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Open AccessArticle

Ultra-High Refractive Index Sensing Structure Based on a Metal-Insulator-Metal Waveguide-Coupled T-Shape Cavity with Metal Nanorod Defects

1
Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE1410, Negara Brunei Darussalam
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Institute of Optoelectronic Sciences, National Taiwan Ocean University, No. 2 Pei-Ning Rd., Keelung 202, Taiwan
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Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu 300, Taiwan
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Institute of Physics, Academia Sinica, Taipei 115, Taiwan
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1433; https://doi.org/10.3390/nano9101433
Received: 10 September 2019 / Revised: 1 October 2019 / Accepted: 8 October 2019 / Published: 10 October 2019
(This article belongs to the Special Issue Nanobiophotonics, Photomedicine, and Imaging)
An ultra-high plasmonic refractive index sensing structure composed of a metal–insulator–metal (MIM) waveguide coupled to a T-shape cavity and several metal nanorod defects is proposed and investigated by using finite element method. The designed plasmonic MIM waveguide can constitute a cavity resonance zone and the metal nanorod defects can effectively trap the light in the T-shape cavity. The results reveal that both the size of defects in wider rectangular cavity and the length of narrower rectangular cavity are primary factors increasing the sensitivity performance. The sensitivity can achieve as high as 8280 nm/RIU (RIU denotes the refractive index unit), which is the highest sensitivity reported in plasmonic MIM waveguide-based sensors to our knowledge. In addition, the proposed structure can also serve as a temperature sensor with temperature sensitivity as high as 3.30 nm/°C. The designed structure with simplicity and ease of fabrication can be applied in sensitivity nanometer scale refractive index sensor and may potentially be used in optical on-chip nanosensor. View Full-Text
Keywords: plasmonics; metal–insulator–metal; finite element method; nanorod defects; sensitivity; T-shape cavity; refractive index sensor; temperature sensor plasmonics; metal–insulator–metal; finite element method; nanorod defects; sensitivity; T-shape cavity; refractive index sensor; temperature sensor
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MDPI and ACS Style

Chou Chau, Y.-F.; Chou Chao, C.-T.; Huang, H.J.; Kumara, N.T.R.N.; Lim, C.M.; Chiang, H.-P. Ultra-High Refractive Index Sensing Structure Based on a Metal-Insulator-Metal Waveguide-Coupled T-Shape Cavity with Metal Nanorod Defects. Nanomaterials 2019, 9, 1433.

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