Defect modes supported by optical lattices in photovoltaic-photorefractive crystals |
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| Authors: | Kehao Li Keqing Lu Jianbang Guo Weijun Chen Tongtong Sun Fengxue Yao Jingjun Xu |
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| Institution: | 1. State Key Laboratory of Transient Optics and Photonics, Xi''an Institute of Optics and Precision Mechanics, Chinese Academic of Sciences, Xi''an 710119, China;2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China;3. School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China;4. Department of Physics, Nankai University, Tianjin 300071, China;1. Materials Characterization Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India;2. School of Materials Science and Engineering, Bengal Engineering and Science University, Shibpur, Howrah 711103, India;3. Thermal Systems Group, ISRO Satellite Centre, Vimanapura Post, Bangalore 560017, India;1. ETSIST, Technical University of Madrid, Madrid, Spain;2. Instituto de Energía Solar, Technical University of Madrid, Madrid, Spain;1. Laboratory of Infrared Materials and Devices, The Research Institute of Advanced Technologies, Ningbo University, Ningbo 315211, China;2. Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China;3. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;4. State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China;5. North Yunnan Chihong photoelectric Co Ltd, Kunming 650000, China;1. Institut Bergonié, INSERM U916, Bordeaux, France;2. Université Bordeaux Segalen, Bordeaux, France;3. Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland;4. Hopitaux Universitaires de Genève (HUG), Geneva, Switzerland;5. Institut Curie & Université Paris Descartes, Paris, France;6. GlaxoSmithKline, Research Triangle Park, USA;7. Edinburgh University, Edinburgh, United Kingdom;8. European Organisation for Research and Treatment of Cancer (EORTC), Brussels, Belgium |
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| Abstract: | We study defect modes in optically induced one-dimensional lattices in photovoltaic-photorefractive crystals. These defect modes exist in different bandgaps due to the change of defect intensity. For a positive defect, defect mode branches exist not only in the semi-infinite bandgap, but also in the first and second bandgaps. When the defect mode branch is fixed, the confinement of defect modes increases with the defect strength parameter. For a negative defect, defect mode branches exist only in the first and second bandgaps. For a given defect mode branch, the strongest confinement of the defect modes appears when the lattice intensity at the defect site is not the smallest in its branch. On the other hand, when the defect strength parameter is fixed, the most localized defect modes arise in the semi-infinite bandgap for the positive defect and in the first bandgap for the negative defect. |
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