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Majestic Books London, ,, United Kingdom. New Paperback Quantity Available: KG, Germany New Hardcover Quantity Available: Loiko, Alexander A. Miskevich, and Valery A. Journal of the Optical Society of America A. Loiko, A. Miskevich, and V. Journal of Experimental and Theoretical Physics, , Vol. DOI: Enhancement of the performance of photovoltaic cells through increasing light absorption due creation of particulate structure of active layer is investigated. In the wavelength range of small absorption index of c-Si 0. In the overall considered range 0. Maximum value of the spectral absorption coefficient approaches unity for multilayers consisting of large amount of sparse monolayers of small particles.
One of the possible realizations of the solar cell based on gradient multilayer of active layer is presented schematically below. The considered particulate structures of active layer are promising for creation of the high efficiency thin-film solar cells. Miskevich A. Russian Federation patent RU ; March The model to describe coherent transmission and reflection coefficients of monolayers is proposed. The features in transmittance interference minima of the monolayers with short- and long-range order are described. On the spectrum of monolayer with short-range ordering partially-ordered , the minimum corresponds to the maximum of the extinction efficiency factor.
For a monolayer with the long-range ordering regularly-packed , a similar minimum takes place. The spectrum for the regularly-packed monolayer has an additional sharp coherent transmittance minimum and the coherent reflection maximum , which is due to the periodicity in particles locations.
These extremes occur at wavelengths comparable to the particle sizes and the distances between them. The developed technique allows one to analyze the coherent transmittance and reflectance of the imperfect 2D planar photonic crystals.
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The photonic band gap for multilayers consisting of close-to-regularly-packed monolayers planar photonic crystals with imperfect lattice and partially-ordered monolayers of particles are investigated using the transfer matrix method. The transmission spectra of multilayer structures multilayers have three types of sharp minima due to interference of waves. Their position and size are determined by the concentration, size, optical constants of the particles, the regularity of their arrangement in the plane of the monolayer, the period of the layered structure and the thickness of multilayers.
The illustration is given in Fig. Some data for coherent transmittance and reflectance spectra of a system consisting of a glass plate coated with monolayers of spherical alumina particles are shown below. Creation of antireflection coatings does not need high ordering in particle locations. Otherwise, the arrangement of particles in monolayer plays a crucial role for selective reflectors and transmission filters.
The reflection coefficient of a glass plate can be significantly reduced by using two-sided coating with monolayers of alumina particles. Comparison the results obtained by the developed model and the known experimental data for the photonic band gap. The results can be used to optimize antireflection coating, diffuses, neutral and spectral filters of the transmitted and reflected light. The proper layer characteristics are determined. The results can be used to estimate the degree of ideality of the photonic crystal arrangement by the data on spectral dependences of the coherent transmission and reflection coefficients, retrieve characteristics of the ordered particulate structures, etc.
Wave-optical treatment of the shadow cast by a large gravitating sphere - INSPIRE-HEP
Loiko V. A method to retrieve parameters of spherical particles arranged into ordered structures by the coherent transmittance spectra is proposed. It is based on the solution of the inverse problem using data on the photonic band gap. The solution has been obtained within the quasicrystalline approximation of the multiple wave scattering theory and the transfer matrix method.
Three-dimensional ordered particulate structures: method to retrieve characteristics from photonic band gap data. The features of anomalous light scattering in a layer containing ordered optically soft particles are described. Simulations disclose that in the layer with two-layered subwavelength-sized particles the bleaching and darkening effects can be implemented. In the first case transmittance increases while in the second case transmittance decreases with volume concentration.
The results show the way to optimize characteristics of the transmission filters for visible and infrared spectral regions. The developed model can be used for light scattering description in liquated glasses, filled liquid crystals, polymer-filled nematics, optical filters, paints, etc. Berdnik V. The effect takes place for monodisperse and polydisperse systems and systems when multiple scattering in the monolayer is essential as well.
In that cases the conditions are changed. The characteristics particles and their concentration to obtain zero coherent transmittance are shown in Fig. The calculations are fulfilled for homogeneous monodisperse spherical nonabsorbing particles at the SSA. The results can be used to optimize characteristics of scattering and absorption by a monolayer and a slab of monolayers; to create scattering and rejection spectral transmission filters, tunable filters, etc. Ivanov A. D: Appl. Konkolovich A.
Electrically controllable tunable spectral filters make it possible to control spectral composition of electromagnetic radiation and considerably simplify the design of electrooptical instruments. Using these filters it is possible create simple and highly functional optical devices and instruments with new service properties. One way to solve this problem is to use dispersion of small particles in liquid crystal.
The dispersion is placed between two parallel substrates, which are transparent for radiation to be filtered and coated with transparent electrodes. The filter is based on the Christiansen effect. Dick V. The figures below illustrate the asymmetry of the angular distribution of transmitted radiation over the polar scattering angle. The angular structure of the scattered light is asymmetric with respect to the polar angle. This effect can be used, for example, to create new types of displays for automatic cash terminals.
An optical model for the effect of field-induced transient scattering in ferroelectric liquid crystals is proposed. Scattering processes are described by introducing an optically anisotropic matrix where transient domains scatterers are generated. The results are obtained for a plane parallel layer of ferroelectric liquid crystals with a planar helicoidal structure under normal illumination with a linearly polarized plane wave. The models to describe extinction and polarization state of light transmitted through a polymer-dispersed liquid-crystal PDLC film with nanosized, spherical, nonabsorbing nematic droplets are created.
Scattering properties of a single droplet are described by the Rayleigh—Gans approximation. Propagation of coherent light field is described in the frame of the Foldy—Twersky theory. The concept of multilevel order parameters is used. Equations for extinction coefficients, phase shift, and polarization of transmitted light for layers with random and oriented droplets are written and discussed.