Authors

J. W. Cleary; G. Medhi; M. Shahzad; I. Rezadad; D. Maukonen; R. E. Peale; G. D. Boreman; S. Wentzell;W. R. Buchwald

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

DOPED SILICON; THIN-FILMS; SILICIDES; Optics

Abstract

The semimetal antimony, with a plasma frequency similar to 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 mu m. 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 mu m. Distinct resonant decreases in specular reflected intensity were observed for Sb lamellar gratings in the wavelength range of 6 to 11 mu m, 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.

Journal Title

Optics Express

Volume

20

Issue/Number

3

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

2693

Last Page

2705

WOS Identifier

WOS:000300499500075

ISSN

1094-4087

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