**5. Acknowledgment**

This work was partly supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (No. 18360008 and 21360007), Mie University COE Projects, a Start-up Grant Program for Mie Venture Business from Mie Industry Enterprise Support Center, the Kinki Invention Center, and the Knowledge Cluster Initiative from the Ministry of Education, Culture, Sports, Science and Technology.

The authors thank Mr. T. Sato (JA Woollam Japan Co., Inc.) for ellipsometry measurement. The authors also thank Dr. H. Miyake, Mr. K. Manabe, Mr. N. Machida, Mr. Y. Nakayama, Mr.

K. Arakawa, and Mr. Y. Seriguchi for their help in the experiments and valuable discussions.

## **6. References**

