1. Division of Physical Sciences and EngineeringKing Abdullah University of Science and Technology Thuwal 23955‐6900 Kingdom of Saudi Arabia
2. State Key Laboratory on Integrated OptoelectronicsCollege of Electronic Science and EngineeringJilin University 2699 Qianjin Street Changchun 130012 P. R. China
3. Core LabsKing Abdullah University of Science and Technology Thuwal 23955‐6900 Kingdom of Saudi Arabia