Role of polytypism and degree of hexagonality on the photoinduced optical second harmonic generation in SiC nanocrystalline films |
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| Affiliation: | 1. Institute for Single Crystals NAS of Ukraine, Kharkov 61001, Ukraine;2. Faculty of Electrical Engineering, Czestochowa University Technology, Armii Krajowej 17, PL-42201 Czestochowa, Poland;3. Department of Inorganic and Organic Chemistry, Lviv National University of Veterinary Medicine and Biotechnologies, Pekarska Street, 50, 79010 Lviv, Ukraine;1. Department of Solid State Physics, Yerevan State University, Alex Manoogian 1, Yerevan 0025, Armenia;2. National University of Architecture and Construction of Armenia, Teryan 105, 0009 Yerevan, Armenia;1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;2. School of Physics and Information Technology, Shaanxi Normal University, Xi''an 710062, China;3. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China;1. Photonics–Electronics Group, Aras International Campus, University of Tabriz, Tabriz 51665-163, Iran;2. Photonics–Electronics Group, Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz 51666-14766, Iran;3. School of Electrical, Electronic and Computer Engineering, The University of Western Australia, Crawley, WA 6009, Australia;1. Amirkhanov Institute of Physics Russian Academy of Sciences, Dagestan Science Centre, Makhachkala, Russia;2. Prokhorov General Physics Institute Russian Academy of Sciences, Moscow, Russia;3. Dagestan States University, Makhachkala, Russia |
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| Abstract: | Photoinduced optiсal second harmonic generation was studied in nanocrystalline SiC films prepared by the method of direct ion deposition. For the studies were chosen three types of polytypes (with different degree of hexagonality) – 24R with degree hexagonality G=25, 27R-G=44, 33R with – G=36. The bicolor photoinduced treatment was performed by the wavelengths 1064nm/532 nm by 15 ns YAG:Nd laser. The efficiency of the output SHG was evaluated by ratio of the corresponding signal intensities with respect to the references and by the time delay between the SHG and the fundamental maxima. Explanation of the observed effect is given within a framework of the occurrence of the nano-trapping levels in the film crystalline interfaces. |
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| Keywords: | Nanocrystalline SiC Nonlinear optics Low-dimensional films |
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