We propose a plasmonic structure, based on a silver-gold two-layered metallic film, where two surface plasmons (SPs) with equal propagation constants are excited simultaneously at different wavelengths. We show theoretically that the bimetallic film provides unique opportunities for manipulation of plasmons and optimization of the accuracy and cross-sensitivity. The structure can be used as an effective self-reference SP sensor in wavelength-interrogated design.
© 2012 Optical Society of America
Optics at Surfaces
Original Manuscript: January 23, 2012
Revised Manuscript: March 13, 2012
Manuscript Accepted: March 16, 2012
Published: May 1, 2012
G. Dyankov, M. Zekriti, and M. Bousmina, "Dual-mode surface-plasmon sensor based on bimetallic film," Appl. Opt. 51, 2451-2456 (2012)