Vertical Plasmonic Mach-Zehnder interferometer for sensitive optical sensing

Qiaoqiang Gan, Yongkang Gao, Filbert J. Bartoli

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Vertical plasmonic Mach-Zehnder Interferometers are investigated theoretically and experimentally, and their potential for ultrasensitive 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. © 2009 Optical Society of America.
Original languageEnglish (US)
Pages (from-to)20747-20755
Number of pages9
JournalOptics Express
Volume17
Issue number23
DOIs
StatePublished - Jan 1 2009
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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