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Optical properties of sub-wavelength hole arrays in SiC membranes

Y A Urzhumov1,3, D Korobkin1, B Neuner III1, C Zorman2 and G Shvets1

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It is shown that perforated SiC membranes can be used for engineering optical properties of metamaterials in the infrared. The complex-valued frequency-dependent effective dielectric permittivity epsiloneff(ω) of a single membrane can be controlled by the size and spacing between the holes. Regions of the anomalous dispersion and strong absorption described by epsiloneff(ω) have been identified and related to the excitation of even-parity surface phonon polaritons of a smooth SiC film. The effective permittivity description has been validated by comparing the transmittance and absorbance of the film obtained from epsiloneff(ω) with that calculated using first principles electromagnetic simulations. Theoretical predictions of the enhanced transmission and absorption in the perforated film have been verified experimentally using FTIR micro-spectroscopy. For the first time, the dependence of enhanced transmission and absorption on the incidence plane of the incoming radiation has been studied.


PACS

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

78.68.+m Optical properties of surfaces

78.30.Hv Other nonmetallic inorganics

71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)

42.70.Km Infrared transmitting materials

78.66.Li Other semiconductors

Subjects

Condensed matter: electrical, magnetic and optical

Semiconductors

Surfaces, interfaces and thin films

Optics, quantum optics and lasers

Dates

Issue 9 (September 2007)

Received 16 March 2007, accepted for publication 2 May 2007

Published 22 August 2007



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