Affiliation: | 1. Research Center for Development of Far-Infrared Region, University of Fukui, Fukui, 910-8507, Japan 2. Institute of Electronics of the Bulgarian Academy of Sciences, Association EURATOM-INRNE, Sofia, 1784, Bulgaria 3. Faculty of Medicine, University of Fukui, Matsuoka-cho, Yoshida-gun, Fukui-ken, 910-1193, Japan 4. Kagawa University, Miki-cho, Kida-gun Kagawa-ken, 761-0793, Japan
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