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FTIR-spectroscopy of (GaAS)n/(AlAs)m superlattices
Institution:1. Departamento de Física, Universidade Estadual de Maringá, Maringá, PR, 87020-900, Brazil;2. Grupo de Óptica e Nanoscopia (GON), Instituto de Física, Universidade Federal de Alagoas, Maceió, AL, 57072-900, Brazil;3. Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA, 18015, USA;1. Department of Energy Materials and Technology, General Research Institute for Nonferrous Metals, Beijing, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;1. School of Physics and Materials Science, Radiation Detection Materials & Devices Lab, Anhui University, Hefei 230601, PR China;2. Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China;3. Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanostructure, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, PR China;1. Physics Department, Faculty of Science, Cairo University, Cairo, Egypt;2. Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia;3. Professor in Materials Science and Nanomaterials, Physics Department, Faculty of Science, EL-Fayoum University, EL-Fayoum, Egypt;4. Nano-Science & Semiconductor Labs., Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt;1. Photovoltaic Laboratory, Centre for Research and Technology Energy, Tourist Route Soliman, BP 95, 2050 Hammam-Lif, Tunisia;2. Higher Institute of Applied Science and Technology of Sousse, City Taffala (Ibn Khaldun), 4003 Sousse, Tunisia
Abstract:The optical properties of (GaAs)n/(AlAs)m superlattices in the infra-red spectral region have been studied. The confinement of optical phonons has been observed in both GaAs and AlAs layers of superlattices under investigation. The superlattice modes caused by the coupling between LO phonons and collective intersubband excitations have been found in doped superlattices. Macroscopic and microscopic calculations have been used for the analysis of experimental results. Good agreement with experiment has been obtained.
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