Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 6: Photonic crystals I
HL 6.6: Vortrag
Montag, 25. Februar 2008, 10:45–11:00, EW 201
Silicon-based low-loss photonic crystal waveguides — •Daniel Pergande1, Peter Nolte1, Alexey Milenin2, and Ralf B. Wehrspohn1 — 1Institut of Physics, Martin-Luther-University Halle-Wittenberg, 06099 Halle — 2Max-Planck-Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
Silicon is the dominating material in today's microelectronics, especially in modern telecommunications, and therefore a lot of experience in microstructuring of silicon exists. Its high dielectric constant makes it a promising candidate for PhC (Photonic Crystal) fabrication. Furthermore, the possibility of integrating electronics and optics on one chip is of great advantage for silicon-based PhC devices.
We present ridge waveguides and PhC waveguides etched in a high-index-contrast SOI-material made of a thin silicon slab embedded in two silica layers. Hence fully symmetrical structures can be realized and two important conditions for low-loss guiding of light in PhC waveguides can be matched: The symmetry avoids polarization mixing and the high index contrast leads to strong confinement of light, so the PhC waveguides allow theoretically lossless guiding of light because of operating completely below the lightcone.
Since the PhC-structures are formed by air pores in the SOI-material, a great degree of freedom consists in the infiltration of the pores. This leads to a new approach for designing PhC-based devices.