**Acknowledgments**

The researchers would like to thank DOST PCIEERD for the research grant for this project, M. Hangyo and K. Takano for the far infrared to mid-IR FT-IR measurements in their lab at the Institute of Laser Engineering, Osaka University. They also thank N. Miyoshi for his help for the near-IR FT-IR measurements in his lab at the Faculty of Medical Sciences, University of Fukui.
