Abstract
This paper presents a study of the optical properties of thermally oxidized
nanoporous silicon in the wavenumber range 5000–400 cm<sup>−1</sup>. It is shown for the
first time that thermally oxidized nanoporous silicon has two broad regions of reduced
transmittance in the wavenumber range from 3720 to 3000 cm<sup>−1</sup> and five narrow
zones that have their minima at the following wave numbers: 2920, 2240, 1680, 840, and
600 cm<sup>−1</sup>. The transmittance spectra of the thermally oxidized SiO<sub>2</sub>–Si
structure are measured in the wavenumber range 5000–400 cm<sup>−1</sup>. It is
established that the thermally oxidized SiO<sub>2</sub>–Si structure is transparent in the
wavenumber range 5000–1200 cm<sup>−1</sup> and has narrow absorption peaks insignificant
in magnitude at 1090 cm<sup>−1</sup> and 620 cm<sup>−1</sup>. It is shown that thermally
oxidized nanoporous silicon can be used as a selectively absorbing and recording medium
in the IR range.
© 2012 OSA
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