Hamburg 2001 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 21: Photonische Kristalle
HL 21.12: Vortrag
Dienstag, 27. März 2001, 18:15–18:30, S9/10
Angular Resolved Photoluminescence Studies of Thin Film Photonic Crystals and their Replicas — •Torsten Maka1, Dmitry N. Chigrin1, Olga N. Samoylova1, Sergei G. Romanov1, Clivia M. Sotomayor Torres1, Manfred Müller2, and Rudolf Zentel2 — 1Inst. für Materialwissenschaften, Fb13, Bergische Universität Wuppertal, 42097 Wuppertal — 2Inst. für organische Chemie, Johannes Gutenberg Universität Mainz, 55099 Mainz
Thin film photonic crystals have been prepared from PMMA beads by self-assembling them in the fcc structure from aqueous suspensions. They combine cheap and quick synthesis with the ease of machinability. Further these opals were used as templates for the preparation of SnS2 replicas. We discuss the emission properties of laser dyes incorporated in thin film PMMA and SnS2 photonic crystals. The PBG of opal replicas is more pronounced and carries potential of omnidirectionality. Comparison of the dye emission from opals and their replicas show the development of PBG-related effects. The emission spectrum of a dye varies in PMMA opals with changing the emission collection angle in agreement with the anisotropy of the stop-band. In contrast, the dye PL spectrum in opal replica demonstrates both, angular dependent and angular independent features, which relate to the dispersion of the stop-band and the density of photon states, respectively. The emission of incorporated laser dyes was used to probe the dispersion of the surfaces of equal energy in the PBG structure of opal-based photonic crystals. Strong directionality of the emission has been observed in both direct and inverted structures.