Optical evidence of a photorefractive effect due to holes in Bi12GeO20 crystals |
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| Affiliation: | 1. Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux I, 33405 Talence, CédexFrance;1. Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, USP C.P. 369, CEP 13560-970, Sao Carlos, SP, Brazil;2. Department of Physics, Kyungpook National University, Daegu, 41566, Republic of Korea;3. Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Universite de Caen, France;1. Institut de Chimie Moléculaire et des Matériaux d''Orsay (ICMMO), Université Paris-Saclay, CNRS, 91405 Orsay, France;2. Department of Applied Science and Technology (DISAT) and RU INSTM, Politecnico di Torino, 10129 Torino, Italy;1. National Taiwan University, Department of Geography, No.1, Sec.4, Roosevelt Rd., Taipei 10617, Taiwan, ROC;2. KTH (Royal Institute of Technology), Department of Urban Planning and Environment, Division of Urban and Regional Studies, SE-100 44 Stockholm, Sweden;3. VTI (Swedish National Road and Transport Research Institute), MAP Unit, SE- 102 15 Stockholm, Sweden;4. KMV Forum AB, Hästholmsvägen 28, 8 tr., SE-131 30 Nacka, Sweden;5. Lund University, Department of Human Geography, SE- 223 62 Lund, Sweden |
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| Abstract: | We report on the first observation to our knowledge of the photorefractive effect due to hole photoconduction in Bi12GeO20 (BGO) crystals. In cubic crystals such as BGO, the study of energy redistribution in two beam coupling experiments does not allow by itself the determination of the sign of the photocarriers. Additional experiments such as ellipsometric measurements have to be performed to give the sign of the effective electrooptic coefficient. Such experiments points out that either holes or electrons govern the photorefractive effect this behavior is demonstrated in both undoped and iron-doped BGO crystals. |
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