The liquid-crystal light valve (LCLV) is a useful component for performing integration, thresholding, and gain functions in optical neural networks. Integration of the neural activation channels is implemented by pixelation of the LCLV, with use of a structured metallic layer between the photoconductor and the liquid-crystal layer. Measurements are presented for this type of valve, examples of which were prepared for two specific neural network implementations. The valve fabrication and measurement were carried out at the State Optical Institute, St. Petersburg, Russia, and the modeling and system applications were investigated at the Institute of Microtechnology, Neuchâtel, Switzerland.
Spatial light modulator based on hydrogenated amorphous silicon/ deformed-helix ferroelectric liquid crystal structure: Influence of dielectric mirror, Ferroelectrics, 246:1, 269-277, The paper presents results on the comparative study of the two modes of the Optically Addressed SLMs based on the amorphous hydrogenated silicon -ferroelectric liquid crystal structure: the transmissive mode SLM and the reflective mode SLM with dielectric mirror. The FLC was used in DHF-mode.
The thermoreflectance of YIG single crystals was measured in the visible energy range. Spectra of this compound support a model that incorporates both localised and oneelectron band states. All structures of the thermoreflectance spectra exhibit temperature dependence. Those at low energies, which occur at 16390, 17220, 19321, 20350, 21450, 22410, 23609 and 24271 cm-' and exhibit a small temperature shift and broadening, were assigned to crystal-field-split localised interionic transitions between the 3d states of Fe3+. The other structures, occurring at 25775, 27367, 30453, 32500, 35248, 39514 and 44202 cm-' with a considerable temperature shift (between 2 x loT3 and 8 x 10-4eVK-') and broadening were ascribed to pair transitions between the 3d states of iron and/or to charge-transfer transitions involving delocalised valence-band oxygen states and iron d-like bands.
PACS. 47.27Te -Convection and heat transfer. PACS. 05.45Tp -Time series analysis. PACS. 05.45Ac -Low-dimensional chaos.Abstract. -Lagrangian chaos is experimentally investigated in a convective flow by means of Particle Tracking Velocimetry. The Finite Size Lyapunov Exponent analysis is applied to quantify dispersion properties at different scales. In the range of parameters of the experiment, Lagrangian motion is found to be chaotic. Moreover, the Lyapunov exponent depends on the Rayleigh number as Ra 1/2 . A simple dimensional argument for explaining the observed power law scaling is proposed.
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