1. Department of Physics, University of Colorado, Boulder, Colorado 80309, United States
2. Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou 310058, People’s Republic of China
3. Department of Electrical, Computer, and Energy Engineering, Liquid Crystal Materials Research Center, and Materials Science Engineering Program, University of Colorado, Boulder, Colorado 80309, United States
4. Renewable and Sustainable Energy Institute, National Renewable Energy Laboratory and University of Colorado, Boulder, Colorado 80309, United States