Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.22: Poster

Tuesday, March 8, 2005, 16:30–19:00, Poster TU F

Nanophotonic Applications of Silicon Carbide — •Bettina Friedel and Siegmund Greulich-Weber — Universität Paderborn, Department Physik, Paderborn

3D photonic crystals for the visible spectrum are preferably prepared from sub-micron-spheres made from silica or organic materials which by self-organization form colloidal crystals. However, these crystals are fragile and exhibit a low refractive index and thus are not suitable for photonic devices. Infiltration of the interparticle voids with materials of appropriate refractive index, followed by removal of the spheres, leads to inverted opals for which a complete photonic bandgap is expected. A number of materials have been infiltrated, however not all are suitable for the visible range and in addition mechanically stable enough. We prefer infiltration by sol-gel routes because of its easy and time-saving application at low cost. Most infiltrates are rather porous and therefore do not feature the expected effective refractive index. We will discuss sol-gel wide-bandgap semiconductors, especially SiC, as possible infiltrates. In view of future photonic applications in-situ tuning of photonic properties becomes necessary, which might be realized by ’electronic’ doping of the semiconductor material. Thus practical doping procedures for sol-gel semiconductor materials are additional requirements.