Numerical study on refractive index sensor based on hybrid-plasmonic mode

Jeong-Geun Yun; Joonsoo Kim; Kyookeun Lee; Yohan Lee; Byoungho Lee

doi:10.1117/12.2264068

23 April 2017 Numerical study on refractive index sensor based on hybrid-plasmonic mode

Jeong-Geun Yun, Joonsoo Kim, Kyookeun Lee, Yohan Lee, Byoungho Lee

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103236U (2017) https://doi.org/10.1117/12.2264068
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

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.

Citation Download Citation

Jeong-Geun Yun, Joonsoo Kim, Kyookeun Lee, Yohan Lee, and Byoungho Lee "Numerical study on refractive index sensor based on hybrid-plasmonic mode", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103236U (23 April 2017); https://doi.org/10.1117/12.2264068

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