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Proceedings Paper

Numerical study on refractive index sensor based on hybrid-plasmonic mode
Author(s): Jeong-Geun Yun; Joonsoo Kim; Kyookeun Lee; Yohan Lee; Byoungho Lee
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Paper Abstract

We propose a highly sensitive hybrid-plasmonic sensor based on thin-gold nanoslit arrays. The transmission characteristics of gold nanoslit arrays are analyzed as changing the thickness of gold layer. The surface plasmon polariton mode excited on the sensing medium, which is sensitive to refractive index change of the sensing medium, is strengthened by reducing the thickness of the gold layer. A design rule is suggested that steeper dispersion curve of the surface plasmon polariton mode leads to higher sensitivity. For the dispersion engineering, hybrid-plasmonic structure, which consists of thin-gold nanoslit arrays, sensing region and high refractive index dielectric space is introduced. The proposed sensor structure with period of 700 nm shows the improved sensitivity up to 1080 nm/RIU (refractive index unit), and the surface sensitivity is extremely enhanced.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103236U (23 April 2017); doi: 10.1117/12.2264068
Show Author Affiliations
Jeong-Geun Yun, Seoul National Univ. (Korea, Republic of)
Joonsoo Kim, Seoul National Univ. (Korea, Republic of)
Kyookeun Lee, Seoul National Univ. (Korea, Republic of)
Yohan Lee, Seoul National Univ. (Korea, Republic of)
Byoungho Lee, Seoul National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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