1. James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, United Kingdom
2. Compound Semiconductor Technologies Global Ltd., Blantyre G72 0BN, United Kingdom
3. QD Laser Inc., Minamiwataridacho, Kawaski-ku, Kawasaki, Kanagawa 210-0855, Japan
4. SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom