1. Department
of Materials Engineering, Ming Chi University of Technology, 84 Gunjuan
Road, Taishan, New Taipei City 243 Taiwan
2. Department
of Photonics, National Chiao Tung University, 1001 University Road, Hsinchu 30010 Taiwan
3. Research
Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academia Road, Taipei 11529 Taiwan