1. Engineering Department; Lancaster University; Lancaster LA1 4YR UK
2. Physics Department; Aristotle University of Thessaloniki; Thessaloniki 54142 Greece
3. Quantum Technology Centre; Department of Physics; University of Lancaster; LA1 4YW UK
4. Department of Engineering; University of Cambridge; 9 JJ Thomson Avenue Cambridge CB3 0FA UK
5. Kyung Hee University; Display Research Laboratory; Department of Information Display; Seoul 130701 South Korea