Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 5: Symposium Nanostructured Photonic Materials

HL 5.2: Hauptvortrag

Montag, 25. Februar 2008, 15:30–16:00, ER 270

Efficient Coupling into Photonic-Crystal Cavities and Waveguides — •Solomon Assefa, William Green, Fengnian Xia, and Yurii Vlasov — IBM Research Center, Yorktown Heights, NY 10589, USA

Photonic-crystals (PhC) provide a compact platform attractive for potential applications such as delay lines, all-optical buffers, highly non-linear devices, and light-matter interaction. To this end, extensive studies are currently in progress to achieve low group-velocity in PhC waveguides while maintaining low chromatic dispersion. Additionally, on-going research on the confinement and enhancement of quantum-dot emission has increased interest in high-Q PhC cavities.

The W1 waveguide and the microcavity designs both require efficient coupling in order to explore the frequency regimes of interest. We will present experimental results focusing on efficient coupling to W1 waveguides and microcavities fabricated in SOI membrane. Coupling schemes such as group-index tapering and surface-state optimization are explored by making reliable phase information measurements in order to study coupling coefficients and high-order dispersion. We investigate strategies for efficient coupling into a suspended PhC microcavity that is side-coupled to a suspended photonic wire via PhC surface state engineering.