1. Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) & Advanced Materials Bio-Engineering Research Centre (AMBER), Trinity College Dublin, Dublin 2, Ireland
2. School
of Physics, Trinity College Dublin, Dublin 2, Ireland
3. School
of Chemistry, Trinity College Dublin, Dublin 2, Ireland
4. Efficient Energy Transfer Deptmartment, Bell Labs Research, Nokia, Blanchardstown Business & Technology Park, Snugborough Road, Dublin 15, Ireland