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87 SOME ELECTRO - OPTICAL CHARACTERISTICS OF ...

87 SOME ELECTRO - OPTICAL CHARACTERISTICS OF ...

87 SOME ELECTRO - OPTICAL CHARACTERISTICS OF

SOME ELECTRO - OPTICAL CHARACTERISTICS OF SEMICONDUCTOR - LIQUID CRYSTAL INTERFACE H. Margaryan, N. Hakobyan, V. Harutyunyan and V. Abrahamyan Yerevan State University, e-mail: harutyunyan@viragelogic.com 1. Introduction In modern photonics and optoelectronics there is big kind of elements (spatial light modulators, optical valves, etc.) based on semiconductor – liquid crystal structure [1]. In such devices it is used the semiconductors’ photoconductivity and liquid crystals’ orientation phenomena. Here, it should be noted that deep investigations of optical and electro-physical characteristics, which take place on such interface, can lead to noticeable improvements of physical parameters of these devices [2, 3]. In this work, the study of some electrooptical characteristics of semiconductor – liquid crystal interface is presented. 2. Experiment The investigated semiconductor – liquid crystal system is a thin layer of nematic liquid crystal located between ITO glass and semiconductor. The presence of semiconductor substrate allows applying constant electric field (DC) along the semiconductor surface. By applying DC electric field to semiconductor substrate the orientation effects appear. To investigate their dynamic characteristics, the method of recording of laser beam reflected from the semiconductor substrate has been used. The scheme of experiment is shown in Fig. 1. Oscilloscope Detector Function Generator P A Fig.1. The scheme of experiment. Laser Power Supply 87

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