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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 12 — Jun. 6, 2011
  • pp: 11202–11212

Angle-and polarization-dependent collective excitation of plasmonic nanoarrays for surface enhanced infrared spectroscopy

Vladimir Liberman, Ronen Adato, Alket Mertiri, Ahmet A. Yanik, Kai Chen, Thomas H. Jeys, Shyamsunder Erramilli, and Hatice Altug  »View Author Affiliations

Optics Express, Vol. 19, Issue 12, pp. 11202-11212 (2011)

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Our recent work has showed that diffractively coupled nanoplasmonic arrays for Fourier transform infrared (FTIR) microspectroscopy can enhance the Amide I protein vibrational stretch by up to 105 times as compared to plain substrates. In this work we consider computationally the impact of a microscope objective illumination cone on array performance. We derive an approach for computing angular- and spatially-averaged reflectance for various numerical aperture (NA) objectives. We then use this approach to show that arrays that are perfectly optimized for normal incidence undergo significant response degradation even at modest NAs, whereas arrays that are slightly detuned from the perfect grating condition at normal incidence irradiation exhibit only a slight drop in performance when analyzed with a microscope objective. Our simulation results are in good agreement with microscope measurements of experimentally optimized periodic nanoplasmonic arrays.

© 2011 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: April 7, 2011
Revised Manuscript: May 12, 2011
Manuscript Accepted: May 12, 2011
Published: May 24, 2011

Vladimir Liberman, Ronen Adato, Alket Mertiri, Ahmet A. Yanik, Kai Chen, Thomas H. Jeys, Shyamsunder Erramilli, and Hatice Altug, "Angle-and polarization-dependent collective excitation of plasmonic nanoarrays for surface enhanced infrared spectroscopy," Opt. Express 19, 11202-11212 (2011)

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