1. Department of Electrical and Electronics Engineering; Department of Physics, and UNAM-National; Nanotechnology Research Center; Institute of Materials Science and Nanotechnology; Bilkent University; TR-06800 Bilkent Ankara Turkey
2. Division of Physics and Applied Physics; Centre for Disruptive Photonic Technologies (CDPT); School of Physical and Mathematical Sciences; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
3. Luminous! Center of Excellence for Semiconductor Lighting and Displays; TPI-The Photonics Institute; School of Electrical and Electronic Engineering; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Avenue Singapore 639798 Singapore