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Opt Express. 2009 Nov 9;17(23):20747-55. doi: 10.1364/OE.17.020747.

Vertical plasmonic Mach-Zehnder interferometer for sensitive optical sensing.

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1
Center for Optical Technologies, Electrical and Computer Engineering Department Lehigh University, Bethlehem, PA 18015, USA. qig206@lehigh.edu

Abstract

Vertical plasmonic Mach-Zehnder Interferometers are investigated theoretically and experimentally, and their potential for ultra-sensitive optical sensing is discussed. Plasmonic interferences arise from coherently coupled pairs of subwavelength slits, illuminated by a broadband optical source, and this interference modulates the intensity of the far-field scattering spectrum. Experimental results, obtained using a simple experimental setup, are presented to validate theoretically predicted interferences introduced by the surface plasmon modes on top and bottom surfaces of a metal film. By observing the wavelength shift of the peaks or valleys of the interference pattern, this highly compact device has the potential to achieve a very high sensitivity relative to other nanoplasmonic architectures reported.

PMID:
19997306
[Indexed for MEDLINE]
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