*Meng-Tsan Tsai5,6, Yen-Li Wang1, Chia-Yen Chia-Yen Ke2, Hsiang-Chieh Lee4,3, Ya-Ju Lee2
(1. Department of Periodontics, Chang Gung Memorial Hospital, Taoyuan, Taiwan, 2. Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taiwan, 3. Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taiwan, 4. Department of Electrical Engineering, National Taiwan University, Taiwan, 5. Department of Electrical Engineering, Chang Gung University, Taoyuan, Taiwan, 6. Department of Dermatology, Chang Gung Memorial Hospital, Linkou, Taiwan)