Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.32: Poster

Montag, 8. März 2004, 16:30–19:00, Poster A

2D photonic crystal slab structures of high refractive index in inorganic glasses — •Karolin Preusser-Mellert¹, Markus Schmidt¹, Gunnar Boettger¹, Uwe Huebner², and Manfred Eich¹ — ¹Technische Universität Hamburg-Harburg, Arbeitsbereich Materialien der Elektrotechnik und Optik, Eissendorfer Str. 38, D-21073 Hamburg, Germany — ²Institut für Physikalische Hochtechnologie e. V., Abt. Magnetik/Quantenelektronik, Winzerlaer Str. 10, D-07745 Jena, Germany

Semiconductors are common materials used for fabricating two-dimensional photonic crystals because of their high refractive index and the existing fabrication technology. But as it comes to integrate photonic crystal structures, these high refractive index materials show larger coupling losses than lower index systems. We have found an alternative way of realizing a high vertical index contrast: We use inorganic glasses as a waveguiding material with a relatively high refractive index - such as titanium dioxide (n=2.5) - and we increase the vertical index contrast with the help of a very low refractive index material: mesoporous silica (n=1.14). This approach combines the advantages of air-bridge-structures and solid substrates excluding their drawbacks. First structures and simulations are presented.