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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2693–2705

Infrared surface polaritons on antimony

Justin W. Cleary, Gautam Medhi, Monas Shahzad, Imen Rezadad, Doug Maukonen, Robert E. Peale, Glenn D. Boreman, Sandy Wentzell, and Walter R. Buchwald  »View Author Affiliations

Optics Express, Vol. 20, Issue 3, pp. 2693-2705 (2012)

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The semimetal antimony, with a plasma frequency ~80 times less than that of gold, is potentially useful as a host for infrared surface polaritons (SPs). Relevant IR SP properties, including the frequency-dependent propagation length and penetration depths for fields into the media on either side of the interface, were determined from optical constants measured on optically-thick thermally-evaporated Sb films over the wavelength range 1 to 40 μm. Plasma and carrier relaxation frequencies were determined from Drude-model fits to these data. The real part of the permittivity is negative for wavelengths beyond 11 μm. Distinct resonant decreases in specular reflected intensity were observed for Sb lamellar gratings in the wavelength range of 6 to 11 μm, where the real part of the permittivity is positive. Both resonance angles and the angular reflectance spectral line shapes are in agreement with theory for excitation of bound surface electromagnetic waves (SPs). Finite element method (FEM) electrodynamic simulations indicate the existence of SP modes under conditions matching the experiments. FEM results also show that such waves depend on having a significant imaginary part of the permittivity, as has been noted earlier for the case of surface exciton polaritons.

© 2012 OSA

OCIS Codes
(040.3060) Detectors : Infrared
(240.5420) Optics at surfaces : Polaritons
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(350.2770) Other areas of optics : Gratings
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Optics at Surfaces

Original Manuscript: November 9, 2011
Revised Manuscript: January 5, 2012
Manuscript Accepted: January 5, 2012
Published: January 23, 2012

Justin W. Cleary, Gautam Medhi, Monas Shahzad, Imen Rezadad, Doug Maukonen, Robert E. Peale, Glenn D. Boreman, Sandy Wentzell, and Walter R. Buchwald, "Infrared surface polaritons on antimony," Opt. Express 20, 2693-2705 (2012)

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