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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 23 — Nov. 9, 2009
  • pp: 20747–20755

Vertical Plasmonic Mach-Zehnder interferometer for sensitive optical sensing

Qiaoqiang Gan, Yongkang Gao, and Filbert J. Bartoli  »View Author Affiliations

Optics Express, Vol. 17, Issue 23, pp. 20747-20755 (2009)

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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.

© 2009 OSA

OCIS Codes
(130.6010) Integrated optics : Sensors
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(310.2790) Thin films : Guided waves

ToC Category:

Original Manuscript: September 29, 2009
Revised Manuscript: October 12, 2009
Manuscript Accepted: October 12, 2009
Published: October 28, 2009

Qiaoqiang Gan, Yongkang Gao, and Filbert J. Bartoli, "Vertical Plasmonic Mach-Zehnder interferometer for sensitive optical sensing," Opt. Express 17, 20747-20755 (2009)

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