Affiliation: | 1. Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui, 910-8507, Japan 2. Department of Physics, North Carolina A&T State University, Greensboro, NC, 27411, USA 3. Joint School of Nanoscience & Nanoengineering (A&T and UNCG), Greensboro, NC, 27401, USA 4. Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8011, Shizuoka, Japan
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