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Interaction of polarized light with comb-shaped metal-coated nanostructures

Abstract

We have studied metal-coated (20-nm-thick gold) periodic grating structures (period T = 350 nm) with a rectangular profile formed on the surface of a GaAs substrate. The spectra of reflection of a linearly polarized light from these gratings have been measured in a wavelength range of 600–1200 nm. A sharp (more than 20-fold) maximum in the polarization contrast has been observed at 720–760 nm. The dependence of this peak on the angle of sample rotation is approximately described by a cos6θ function. The formation of contrast and its features are related to the excitation of surface plasmons at the metal-air interface on vertical walls of the grating structure.

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Correspondence to I. A. Slovinskii.

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Original Russian Text © I.A. Slovinskii, R.P. Seisyan, M.E. Sasin, I.E. Panaiotti, M.V. Maksimov, S.O. Kognovitskii, 2012, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2012, Vol. 38, No. 4, pp. 34–40.

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Slovinskii, I.A., Seisyan, R.P., Sasin, M.E. et al. Interaction of polarized light with comb-shaped metal-coated nanostructures. Tech. Phys. Lett. 38, 172–174 (2012). https://doi.org/10.1134/S1063785012020290

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Keywords

  • Technical Physic Letter
  • GaAs Substrate
  • Vertical Wall
  • Beam Divergence
  • Sample Rotation