Chuu Der-San | Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.

Department Of Physics And Center For Nano-technology Chung-yuan Christian University

Department of Physics and Center for Nano-Technology, Chung-Yuan Christian University, Chung-Li, Taiwan 32023, ROC

Institute of Photonics, National Changhua University of Education, Changhua, Taiwan 50058, R.O.C.

Department of Physics, Chung Yuan Christian University, Chungli, Taiwan 32023, R.O.C.

Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.

Department of Physics, Chung Yuan Christian University, Chungli, Taiwan 32023, R.O.C.

Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.

Department of Electronic Engineering, National University of Kaohsiung, Kaohsiung, Taiwan 811, R.O.C.

Department of Physics, Chung Yuan Christian University, Chungli, Taiwan 32023, R.O.C.

Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 300, R.O.C.

Department of Electronic Engineering, Chung Yuan Christian University, Chungli, Taiwan 32023, R.O.C.

Department of Physics, Chung Yuan Christian University, Chungli, Taiwan 32023, R.O.C.