Regensburg 2000 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 12: Poster I: Quanten Hall Effekt (1-9), II-VI Halbleiter (10-17), Epitaxie (18-23), Quantenpunkte und -dr
ähte (24-50), Photonik (51-59), Metall-Isolator Übergang (60-64), Si/Ge (65-67), Elektronentheorie (68-69), Amorphe Halbleiter, Ionen-Implantation
HL 12.56: Poster
Montag, 27. März 2000, 14:00–19:00, A
Light Emission from Polymeric Thin Film Photonic Crystals — •Torsten Maka1, Sergei G. Romanov1, Dimitry N. Chigrin1, Clivia Sotomayor Torres1, Manfred Müller2, and Rudolf Zentel2 — 1Inst. of Materials Science and Dept. of Electrical Engineering, BUGH Wuppertal — 2Inst. of Materials Science and Dept. of Chemistry, BUGH Wuppertal
The Photonic energy band structure, which emerges if a periodic modulation of the dielectric properties is built-in in a light emitter, provides a means for spontaneous emission control. We have built films of tens of micron thick face-centred packages of identical PMMA balls acting as photonic crystal films which show intensive play of colours being illuminated with white light. This Bragg diffraction pattern was identified by angular resolved reflectance/transmission spectroscopy. The emission of a laser dye, which was incorporated in PMMA balls has been used as the optical probe to study the PBG effect upon the emission in such structures. Dramatic changes have been observed compared with the pure dye-polymer films, which let us to resolve the profile of the density of photonic states, the directionality of emission and changes in the emission rate. These properties demonstrate the anisotropy in accord with the anisotropy of the stop-band. The chemical routine of the thin film photonic crystal formation and the physical background under their photonic performance are discussed.