A. V. Mikhaĭlov

Study of the structural and optical properties of thin polycrystalline zinc oxide films obtained by the ion-plasma method

This paper presents the results of a study of thin polycrystalline films of zinc oxide, created using the new Elion technology—ion-plasma sputtering of a metallic target in the medium of a powerful gaseous oxidant. It is shown that the ion-plasma method can be used to synthesize thin polycrystalline films of zinc oxide with optical properties close to those of single-crystal zinc oxide. The optical properties of thin polycrystalline zinc oxide films synthesized by the ion-plasma method can be used as a light–sound guide of thin-film acoustooptic devices that operate on the basis of surface acoustic waves or UV photodetectors.

Forming a silicon nanocomposite by laser annealing in a strong oxidant medium

This paper discusses the transmission spectra of a nanocomposite created by a new electron–ion technology—low-temperature laser surface modification of a layer of nanoporous silicon in a medium of a strong gaseous oxidant. A selective-absorption effect has been detected in the IR range. It is shown that the transmission spectrum of laser-oxidized nanoporous silicon has the form of a complex curve with four local minima, lying in the wavenumber ranges 4000–2750  cm−1, 2400–2100  cm−1, 1900–1600  cm−1, and 1300–1000  cm−1. A comparison of the transmission spectra of thermally oxidized nanoporous silicon and laser-modified nanoporous silicon in a strong oxidant atmosphere made it possible to explain the selective absorption of optical radiation in the nanocomposite thus created.

On the theory of the ellipsometry of an actual surface

This paper discusses the question of why it is not justified to describe surface roughness by an effective layer in the case of ellipsometric measurements. It is shown that the residual signal of an ellipsometer is determined by radiation scattering at the surface being measured.

Optical and performance properties of fluoride and oxide films produced by vacuum evaporation

We discuss a range of issues related to optimization of industrial production processes used for deposition of metal fluoride and metal oxide films on optical components. We determine the optical and performance properties of films produced for commercially manufactured equipment via high-vacuum evaporation. We find that substrate temperature, vacuum chamber residual pressure, vacuum chamber working pressure, and ion source operating mode have an effect on these characteristics.

Study of the optical and photoluminescence properties of nanostructured zinc oxide films obtained by the ion–plasma method

This paper presents the results of a study of the structural, optical, and photoluminescence properties of nanostructured zinc oxide films created by the method of ion–plasma sputtering of a metallic target at various gas pressures. It is shown that such zinc oxide films possess optical and photoluminescence properties close to those of single-crystal zinc oxide and can be used as a material for creating thin-film acoustooptic devices that operate on surface acoustic waves or for the receptor areas of UV photodetectors.

Investigating the energy spectrum of silicon nanoclusters in a silicon dioxide matrix

This paper presents the results of an investigation of the energy spectrum of traps that occur in a silicon nanocomposite created using the new “elion” technology—low-temperature laser modification of the surface of a layer of nanoporous silicon in the medium of a strong gaseous oxidant. Combined analysis of the transmission spectra of laser-oxidized nanoporous silicon and the trap-distribution function over the activation energy made it possible to explain the presence of selective absorption in the IR region.

Multispectral optical coatings for protection from laser radiation

Calculations have been carried out and designs determined for multilayer optical coatings for effectively protecting the eyes and apparatus from several laser radiations in the 320–1600-nm region simultaneously. The calculated spectral characteristics of filters are presented for blocking radiation at four wavelengths (355, 532, 1064, and 1540 nm) and six wavelengths (355, 532, 694, 1064, 1315, and 1540 nm) of laser radiations. The optical density in the suppression zones is at least 3. The transmittance in the visible region is about 50%. Test batches of coatings have been fabricated under production conditions, and the results of the tests are presented.

Synthesizing film-forming materials based on aluminum nitride in order to form optical coatings from them

This paper discusses questions of synthesizing and pressing aluminum nitride in order to obtain film-forming materials that can be used to form optical coatings. Based on the resulting film-forming materials, a technological process has been developed for fabricating coatings from aluminum nitride, based on two vacuum methods of depositing thin films: vacuum evaporation and magnetron sputtering. Questions of the use of aluminum nitride films in optical instrumentation are considered.

Optical and photoluminescence properties of ytterbium-doped porous silicon subjected to laser-stimulated oxidation

This paper describes the results of creating a silicon composite doped with ytterbium ions, based on the process of laser-stimulated oxidation of a layer of porous silicon that contains ytterbium nitrate. It presents studies of the transmission spectra and photoluminescence spectra of a layer of ytterbium-ion-doped oxidized porous silicon. The transmission spectra show that the layer of porous silicon is oxidized when the laser acts on the surface of the porous silicon. The photoluminescence spectra demonstrate that ytterbium ions are present in the Yb3+ state. Results are presented of a study of the thermally activated conduction currents of the original porous silicon, of laser-oxidized porous silicon, and of a layer obtained by laser-stimulated oxidation of porous silicon that contains ytterbium nitrate. A comparative study is done of the transformation of the energy spectrum of traps, carried out in the process of laser-stimulated oxidation of a layer of porous silicon in the presence of ions of the rare-earth elements.

Photoluminescence and photoconductivity of a thin film of oxidized nanoporous silicon doped with erbium ions

This paper presents the results of an investigation of the photoluminescence and photoconductivity of a thin film of oxidized nanoporous silicon doped with erbium ions. Structural studies showed that silicon clusters of spherical shape and sizes from 5 to 15 nm are present in the layer. Investigation of the photoluminescence spectra showed that they include intense peaks characteristic of the luminescence of erbium ions. Study of the spectral dependences of the photoconductivity revealed that the nanocomposite under investigation has a complex system of the energy distribution of the traps responsible for the photostimulated generation and recombination of minority charge carriers.