Abstract. The simulation of optical wavefront decomposition on Zernike polynomials based on the multi-channel diffractive optical element (DOE) was performed. This approach is an alternative to classical wavefront sensors and may be used to determine weighted values of aberrations in the analysed wavefront in real time thus, facilitating the aberrometry analysis of the human eye optical system. An investigation of multi-channel analysers was performed on test examples and the applicability of the techniques in solving particular applications are defined.Keywords: wavefront analysis, Zernike polynomials, human eye optical system, multi-channel diffractive optical element.Citation: Kirilenko MS, Khorin PA, Porfirev AP. Wavefront analysis based on Zernike polynomials.
Abstract. In this work the "central" surface plasmon-polariton was obtained by using frequency dependent difference time-domain method for the TMpolarized light at 532 nm, which was propagating through the silver nano-strip, placed on silica glass in an aqueous medium. The height and width of nanostrip was equal to 20 nm and 215 nm respectively. The intensity of surface plasmon-polariton was 4 times higher the intensity of the incident radiation. The full width at half maximum of the nanojet was 138 nm.Keywords: surface plasmon-polariton, nano-strip, (FD) 2 TD-method.Citation: Kozlova ES. Formation of plasmonic nanojets by silver nano-strip.
Abstract. The objective of this paperwork is the development of a crystal lattice parameter identification algorithm, which allows obtaining a more accurate solution compared to the Bravais unit cell estimation algorithm. To achieve the objective, we suggest solving the parameter identification problem using the steepest descent gradient method. The study of the parameter identification accuracy was conducted on a large number of modeled crystal lattices using the edges and angles similarity measures for Bravais unit cells.Keywords: crystal lattice, Bravais unit cell, Wigner-Seitz unit cell, similarity measure, translation vector, parameter identification, gradient steepest descent method.Citation: Shirokanev AS, Kirsh DV, Kupriyanov AV. Application of gradient steepest descent method to the problem of crystal lattice parametric identification.
Abstract. We propose to integrate diffractive axicons into solar cells as a light trap for increasing of light absorbing efficiency. Experimental work and numerical simulations are provided in this paper. The experimental measurements of light-to-electricity conversion efficiency are conducted using a laser with tunable wavelength.Keywords: solar cell, diffraction grating, axicon, light trapping. IntroductionThe latest days increasing of efficiency and decreasing of the cost can be noticed in the solar power engineering development. It is providing a significant growth of photovoltaic energy production and solar cells manufacturing [1,2]. Thus, solar cells efficiency increasing methods development is a relevant problem at present. There are two problem classes of light-to-electricity conversion efficiency. The first is the problem of efficiency increasing of light transportation to an active semiconductor (optical efficiency problem). And the second one is the problem of efficiency increasing of the delivered light conversion into electric current (quantum efficiency problem).There is a review in the paper [3] where basic methods of optical efficiency increasing problem solving are shown. Among the mentioned methods we can emphasize a method which consists of using of additional optical elements and devices such as mirrors and diffractive and refractive optical elements for high-performance concentration and delivering of light towards a solar cell. This approach makes it possible to decrease the cost of electric energy generation due to significant decreasing the solar element area [4,5]. After analysis of optical efficiency increasing methods we can conclude that the integration of diffractive gratings and solar cells is the inexpensive and appropriate approach to efficient solar cells manufacturing.
Abstract. In this paper we consider the possibility of replacing the diffraction axicon and the conical axicon on the gradient lens with a linear variation of the refractive index. Analytically and numerically using the finite-difference timedomain method we performed a comparative study of the Gaussian beam diffraction on diffraction mikro-axicon, conical axicon and gradient microlens consisting of subwavelength layers. The parameters under consideration the types of elements estimated in the depth of focus and a transverse dimension of beam.Keywords: diffraction optics, subwavelength structures, laser beams, diffraction axicon, layered lens, conical axicon, FDTD.Citation: Savelyev DA. Diffraction of the Gaussian beam on layered lens and similar a conical and diffraction axicons.
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