Numerical and analytical evaluations of the sensing sensitivity of waveguide mode in one-dimensional metallic gratings

We study numerically and analytically the refractive index sensing sensitivities of surface plasmon (SSP) and waveguide (SWG) modes arising from one-dimensional Au gratings. By using rigorous coupled wave analysis, we find that while SSP is mainly controlled by the periodicity of the grating, the sh...

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Bibliographic Details
Published in:Nanotechnology 2012-07, Vol.23 (27), p.275501-275501
Main Authors: Lei, Dang Yuan, Wan, Jones T K, Ong, Hock Chun
Format: Article
Language:English
Subjects:
Computer Simulation
Design engineering
Detection
Equipment Design
Equipment Failure Analysis
Exact solutions
Grooves
Mathematical analysis
Metals - chemistry
Models, Chemical
Nanoparticles - chemistry
Nanoparticles - ultrastructure
Origins
Plasmons
Refractometry - instrumentation
Refractometry - methods
Surface Plasmon Resonance - instrumentation
Surface Plasmon Resonance - methods
Waveguides
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Summary:We study numerically and analytically the refractive index sensing sensitivities of surface plasmon (SSP) and waveguide (SWG) modes arising from one-dimensional Au gratings. By using rigorous coupled wave analysis, we find that while SSP is mainly controlled by the periodicity of the grating, the shape of the groove governs SWG. As a result, it is possible to increase SWG to 1000 nm RIU and figure of merit to 24 by tailoring the height and width of the groove. Finally, a simple analytical expression is derived to describe SWG and it agrees well with the numerical data. This easy-to-use expression not only reveals the origin of waveguide mode sensitivity, but also provides useful guidance for the theoretical design and experimental realization of high-sensitivity metallic-gratings-based biosensors.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/23/27/275501