Hybrid plasmonic biosensor for simultaneous measurement of both thickness and refractive index

Ma, Youqiao, Farrell, Gerald, Semenova, Yuliya, Chan, Hau Ping and Wu, Qiang (2013) Hybrid plasmonic biosensor for simultaneous measurement of both thickness and refractive index. Infrared Physics & Technology, 60. pp. 134-136. ISSN 1350-4495

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Official URL: http://dx.doi.org/10.1016/j.infrared.2013.04.001

Abstract

A novel hybrid plasmonic biosensor using a sub-wavelength reflection metal grating is proposed and analyzed. The simulation results show that the hybrid plasmonic-cavity (HPCM) are wavelength dependent on both the refractive index (RI) and thickness of the surrounding analyte layer, with a sensitivity of 448 nm/RIU (refractive index unit) and 75 nm/μm, respectively. However wavelength related to the cavity resonant mode (CRM) is only sensitive to the environmental refractive index changes. In principle it is possible to determine both RI and thickness of the coating layer simultaneously.

Item Type: Article
Uncontrolled Keywords: surface plasmon polaritons (SPPs), refractive index sensing
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Ay Okpokam
Date Deposited: 15 May 2015 15:27
Last Modified: 24 Oct 2017 08:53
URI: http://nrl.northumbria.ac.uk/id/eprint/22497

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