1. a Department of Electrical Engineering , Institute of Microelectronics, National Cheng Kung University , 1 Ta-Hsueh Road, Tainan , 701 , Taiwan , ROC
2. b Department of Electrical Engineering, and Advanced Optoelectronic Technology Center , National Cheng Kung University , 1 Ta-Hsueh Road, Tainan , 701 , Taiwan , ROC
3. c Department of Electrical Engineering , Kun Shan University , 949 Dawan Road, Yongkang City, Tainan County , 710 , Taiwan , ROC
4. d Medical Devices and Opto-Electronics Equipment Department , Metal Industries Research & Development Center , 3F, No. 88, Luke 5th Road, Lujhu Township, Kaoshiung , 82151 , Taiwan