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Increased detection sensitivity of surface plasmon sensors using oblique induced resonant coupling

Authors :
Wan-Shao Tsai
Ming-Yang Pan
Pei-Kuen Wei
Kuang-Li Lee
Source :
Optics Letters. 38:4962
Publication Year :
2013
Publisher :
The Optical Society, 2013.

Abstract

Increased detection sensitivity was achieved by adjusting the incident angle on periodic gold nanostructures that induced a resonant coupling between surface and substrate surface plasmon modes. For 500 nm-period gold nanoslits, a small incident angle, 7°, resulted in 2.64 times narrower linewidth and a 1.8 times increase in the figure of merit as compared to normal incidence. Furthermore, the intensity sensitivity was increased 4.5 times due to the change in the resonant coupling and redshift of the surface plasmon mode.

Details

ISSN :
15394794 and 01469592
Volume :
38
Database :
OpenAIRE
Journal :
Optics Letters
Accession number :
edsair.doi.dedup.....c7188af5d9cfb0c2139fbb0956736b4c