1. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Center for Micro‐Nanotechnology School of Physics Beijing Institute of Technology Beijing 100081 P. R. China
2. Key Lab of Advanced Optoelectronic Quantum Design and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing 100081 P. R. China
3. Beijing Key Lab for Precision Optoelectronic Measurement Instrument and Technology School of Optics and Photonics Beijing Institute of Technology Beijing 100081 P. R. China
4. Kunming Institute of Physics Kunming 650223 P. R. China
5. MOE Key Lab of New Processing Technology for Nonferrous Metals and Materials and Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials School of Resources, Environment and Materials Guangxi University Nanning 530004 P. R. China