Abstract
We investigate fluorescence and lasing action from strongly modulated two-dimensional surface relief structures with hexagonal symmetry onto which thin films of optically active organic material have been deposited. As compared with second-order laser structures with square symmetry, these organic photonic crystal lasers exhibit unusual feedback mechanisms. As a result, we observe surface-emitting lasing action with a central beam normal to the surface and a hexagonal emission pattern of side-beams whose direction slightly deviates from the normal. A corresponding theoretical analysis allows us to determine the photonic bandstructure and the low-threshold laser modes in this system. These results agree very well with fluorescence data and confirm the hexagonal lasing pattern and the corresponding emission angles.
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Forberich K, Ph.D. thesis, Universität Freiburg (2005)
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42.55.Tv; 42.70.Jk; 42.70.Qs
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Forberich, K., Diem, M., Crewett, J. et al. Lasing action in two-dimensional organic photonic crystal lasers with hexagonal symmetry. Appl. Phys. B 82, 539–541 (2006). https://doi.org/10.1007/s00340-005-2120-y
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DOI: https://doi.org/10.1007/s00340-005-2120-y