1. SUPA Institute of Photonics and Quantum Sciences School of Engineering and Physical Sciences Heriot‐Watt University Edinburgh EH14 4AS UK
2. College of Material Science and Engineering Kunming University of Science and Technology Kunming 650093 China
3. School of Information Science and Engineering Lanzhou University Lanzhou 730000 China
4. Key Laboratory of In‐Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China
5. School of Mathematics and Physics North China Electric Power University Baoding 071003 China
6. Laboratory of Weak Light Nonlinear Photonics Ministry of Education School of Physics and Teda Applied Physics Institute Nankai University Tianjin 300071 China
7. Department of Physics and Center for Metamaterials Research The Hong Kong University of Science and Technology Hong Kong China