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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 16 — Jun. 1, 2010
  • pp: 3102–3110

Long-wave infrared surface plasmon grating coupler

Justin W. Cleary, Gautam Medhi, Robert E. Peale, and Walter R. Buchwald  »View Author Affiliations

Applied Optics, Vol. 49, Issue 16, pp. 3102-3110 (2010)

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We present a simplified analytic formula that may be used to design gratings intended to couple long-wave infrared radiation to surface plasmons. It is based on the theory of Hessel and Oliner (1965). The recipe is semiempirical, in that it requires knowledge of a surface-impedance modulation amplitude, which is found here as a function of the grating groove depth and the wavelength for silver lamellar gratings at CO 2 laser wavelengths. The optimum groove depth for photon-to-surface-plasmon energy conversion was found by experiment and calculation to be 10 % 15 % of the wavelength. This value is about twice what has been reported previously in the visible spectral range for sinusoidal grating profiles.

© 2010 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons
(260.3060) Physical optics : Infrared
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: March 1, 2010
Revised Manuscript: April 29, 2010
Manuscript Accepted: May 4, 2010
Published: May 28, 2010

Justin W. Cleary, Gautam Medhi, Robert E. Peale, and Walter R. Buchwald, "Long-wave infrared surface plasmon grating coupler," Appl. Opt. 49, 3102-3110 (2010)

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