Our research on organic thin-film laser devices involves using a combination of liquid crystals and polymer materials to create hybrid laser devices that exhibit a range of different functionalities from polarisation and wavelength tuning, to optical beam steering (see for example Figure 1). We are interested in developing new laser sources based upon these organic materials in an attempt to create low-threshold lasers that are potentially compatible with low-cost manufacturing techniques. The research includes both fundamental studies of the emission characteristics such as coherence properties as well as the design and fabrication of new device architectures.
Figure 1. Laser emission from a flexible defect-mode liquid crystal laser (A Thin‐Film Flexible Defect‐Mode Laser - Ali - 2020 - Advanced Optical Materials - Wiley Online Library).
For this research, we have worked in collaboration with a variety of different research groups including the groups of Professors Henry Snaith FRS and Moritz Riede in the Department of Physics (University of Oxford) to develop new thin-film liquid crystal lasers that consist of bulk (see for example Figure 2) or nanocrystal perovskite structures The aim of this work is to develop new, low threshold laser sources that are photostable and can be tuned using external stimuli. This work has also been carried out in collaboration with Professor Albert Schenning's group at the Eindhoven University of Technology and the Optoelectronics Research Group in the Cavendish Laboratory at the University of Cambridge.
Figure 2. Emission from a perovskite structure using a flexible chiral nematic (cholesteric) reflector.
Taimoor Ali, Jia‐De Lin, Benjamin Snow, Xiuze Wang, Steve J. Elston, Stephen M. Morris Advanced Optical Materials 8, 1901891 (2020)
S. M. Wood, J. A. J. Fells, S. J. Elston, and S. M. Morris Macromolecules 29, 8643-8652 (2016)
Simon J. Wood, Steve J. Elston, and Stephen M. Morris Molecular Crystals and Liquid Crystals 632, 89-96 (2016)
S. M. Wood, F. Castles, S. J. Elston, and S. M. Morris, RSC Advances, 6, 31919-31924 (2016)
M. Saliba, S. M. Wood, J. B. Patel, P. K. Nayak, J. Huang, J. A. Alexander-Webber, B. Wenger, S. D. Stranks, M. T. Horantner, J. Tse-Wei Wang, R. J. Nicholas, L. M. Herz, M. B. Johnston, S. M. Morris, H. J. Snaith, and M. K. Riede Advanced Materials, 28, 923-929 (2016)
S. M. Wood, M. Prévôt, M. Amela-Cortes, S. Cordier, S. J. Elston, Y. Molard and S. M. Morris Advanced Optical Materials, 3, 1368-1372, (2015)
S. D Stranks, S. M Wood, K. Wojciechowski, F. Deschler, M. Saliba, H. Khandelwal, J. B Patel, S. Elston, L. M. Herz, M. B Johnston, A. P. H. J. Schenning, M. G. Debije, M. Riede, S. M Morris, and H. J. Snaith, Nano Letters 15, 4935-4941 (2015)