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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14338
Title: Sensitivity enhancement of a conventional gold grating assisted surface plasmon resonance sensor by using a bimetallic configuration
Authors: Bijalwan A.
Rastogi, Vipul K.
Published in: Applied Optics
Abstract: A surface plasmon resonance (SPR)-based refractive index sensor using a silver grating fabricated over the gold film is proposed. The performance of the sensor has been evaluated on the basis of sensitivity, full width half maximum (FWHM), and dip strength of the reflection spectrum. Rigorous coupled wave analysis has been utilized to study the effect of grating parameters on sensing performance. Our systematic analysis exhibits that inappropriate grating parameters may lead to poor performance of the sensor. Sensitivity of the conventional gold grating (grating engraved in gold) assisted SPR sensor is obtained to be 321°/RIU. Further, we have shown that sensitivity and FWHM could be improved by using a bimetallic structure that consists of a silver grating on a thin gold film and thereby increases the quality factor. Sensitivity of the proposed structure is 346°/RIU with a quality factor more than 97.46 RIU−1. © 2017 Optical Society of America.
Citation: Applied Optics (2017), 56(35): 9606-9612
URI: https://doi.org/10.1364/AO.56.009606
http://repository.iitr.ac.in/handle/123456789/14338
Issue Date: 2017
Publisher: OSA - The Optical Society
ISSN: 1559128X
Author Scopus IDs: 57193803914
7006364661
Author Affiliations: Bijalwan, A., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Rastogi, V., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Corresponding Author: Bijalwan, A.; Department of Physics, Indian Institute of Technology RoorkeeIndia; email: ashis.dph2014@iitr.ac.in
Appears in Collections:Journal Publications [PH]

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