NDLI: Highly Sensitive Miniaturized Refractive Index Sensor Based on Au-Ag Surface Gratings on a Planar Optical Waveguide

Content Provider	IEEE Xplore Digital Library
Author	Tripathi, S.M. Kumar, A. Marin, E. Meunier, J.-P.
Copyright Year	1983
Abstract	We present the theoretical study of a novel highly sensitive, miniaturized, integrated optic refractive index sensor based on a Au-Ag surface grating. The grating is considered to be made of alternate layers of equi-thick Au and Ag regions along the direction of propagation, on the surface of the waveguide. Due to the same thickness of both the metals, the surface plasmon polaritons (SPP) for both metals have their field maxima at the same transverse distance, leading to an increased modal overlap in the grating region and hence a reduced grating length. An exact coupled-mode-theory based on the local mode matching has been used to analyze the mode coupling between the guided mode and the SPP. It has been shown that the proposed design requires nearly one fourth of the grating length as compared to the corrugated metal grating for the same metal thickness. Further, for co-propagating mode coupling (LPG based sensor) the structure is found to be maximum sensitive at an optimum metal thickness, however, such an optimum metal thickness does not exist for counter-propagating coupling (FBG based sensor).
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	2469
Ending Page	2476
Page Count	8
File Size	737364
File Format	PDF
ISSN	07338724
Volume Number	28
Issue Number	17
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical sensors Refractive index Surface waves Optical surface waves Gratings Optical refraction Optical variables control Optical waveguides Optical planar waveguides Planar waveguides surface plasmon polariton Integrated optic waveguides refractive index sensor surface gratings
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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