1. School of Physics, the Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), and Advanced Materials and BioEngineering Research (AMBER) Centre, Trinity College Dublin, Dublin 2, Ireland
2. Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
3. SFI Tetrapyrrole Laboratory, School of Chemistry, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, Dublin D02 R590, Ireland