Chin-Wei Hsu3 , Yue-Bai Ku3 , Hsin-Hsien Chen3 , Shu-Hsien Liao3 , Li-Min Wang2 , Herng-Er Horng3 and Hong-Chang Yang1,2 1 Department of Electro-Optical Engineering, Kun Shan University, Tainan 710, Taiwan Graduate Institute of Applied Physics and Department of Physics, National Taiwan University, Taipei 106, Taiwan 3 Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei 116, Taiwan 2 E-mail: hcyang@phys.ntu.edu.tw Received 8 July 2013, in final form 27 August…
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