Surface plasmon resonance sensor based on bimetallic alloys grating

A surface plasmon resonance sensor based on triangular alloys grating with high performance is proposed. The grating consists of homogeneous binary gold alloys of formula Au x M 1− x , where M is silver, platinum and palladium. It is observed that the two metals, platinum and palladium, have an almo...

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Bibliographic Details
Published in:Indian journal of physics 2016, Vol.90 (1), p.125-130
Main Authors: Dhibi, A., Sassi, I., Oumezzine, M.
Format: Article
Language:English
Subjects:
Alloys
Astrophysics and Astroparticles
Gold
Gold base alloys
Mathematical models
Original Paper
Palladium
Physics
Physics and Astronomy
Plasmons
Sensors
Silver
Surface chemistry
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Summary:A surface plasmon resonance sensor based on triangular alloys grating with high performance is proposed. The grating consists of homogeneous binary gold alloys of formula Au x M 1− x , where M is silver, platinum and palladium. It is observed that the two metals, platinum and palladium, have an almost identical surface plasmon resonance in gold alloys irrespective of composition x . The resonance sensitivity becomes highly dependent on gold composition. The composition of gold around 0.1 is found to have a higher sensitivity. 0.1 composition of Au and 0.9 of Ag gives a high sensitivity. Consequently, the quality of the sensor is improved. Numerical simulations show that the angular sensitivity of the sensor reaches 100°/RIU and the full width at half maximum of the resonant dip is only 1.2°. Moreover, the sensor has not only a high sensitivity and a high resolution, but also a good linearity.
ISSN:0973-1458
0974-9845
DOI:10.1007/s12648-015-0716-6