Hannover 2003 – wissenschaftliches Programm

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Q: Quantenoptik

Q 49: Poster: Photonik

Q 49.9: Poster

Donnerstag, 27. März 2003, 16:30–18:30, Lichthof

Engineering Nanoarchitectures for Photonic Crystals — •Frank Marlow and Wenting T. Dong — Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany

Self-assembly techniques leading to opals or inverse opals are promising for the fabrication of 3D photonic crystals. However, up to now these systems appeared to have either no complete photonic bandgap (opals) or only one small gap between the 8th and the 9th band (inverse opals). In this contribution we show that the detailed shape of the dense-material network of inverse opals has a significant influence on the appearance of bandgaps in these photonic crystals. One example of a network which is topologically very similar to known inverse opals, is the skeleton structure which can show a novel bandgap between the 5th and the 6th band or even two complete bandgaps.[1] Like all inverse opals, these structures are self-standing and capable to be fabricated via self-assembly strategies. The first step for obtaining the novel kind of photonic crystals has been achieved by synthesizing a titania skeleton structure. This structure was obtained by a sol-gel process in the voids of an artificial opal. We describe these novel skeleton structures in detail and analyze their optical and structural properties.

Summarizing, the matter distribution in the unit cell of inverse opals has a dramatic effect on the band structure and there are realistic possibilities to influence this distribution in the synthesis process.

[1] W. T. Dong, H. Bongard, B. Tesche, F. Marlow, Adv. Mater. 14 (2002) 1457