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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.32: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Taper design for high Q factors in hybrid photonic wire slot microcavities — •Clemens Schriever, Christian Bohley, and Jörg Schilling — Zentrum für Innovationskompetenz SiLi-nano, Martin-Luther-Universität Halle Wittenberg

An outstanding property of photonic crystals is their ability to confine light in a small volume. Microcavities with huge quality factors (Q-factors) can be created in such a way enabling a strong light matter interaction. These cavities were commonly produced by introducing defects into planar 2D photonic crystals by removing or shifting single pores. Recently, there is a growing interest in 1D photonic crystal microcavities realized by etching periodic pore chains into photonic wires. Here, possible designs of slotted photonic wire microcavities are numerically investigated, which allow intensive light matter interaction. In contrast to solid microcavities, here the microcavity consists of a slot etched into the waveguide at the cavity position. The slot can be locally infiltrated and offers the possibility to be used as a device for sensing or nonlinear optical applications or as an optical nano probe. The Q factor of the device can be enhanced by a proper design of a tapering region between the mirrors and the cavity. These tapers can be designed to match the electric field distribution of the cavity mode to the field of the evanescent Bloch mode in the mirror, thus reducing scattering losses. We have adapted the design concept for solid cavities and modified it for the case of an infiltrated hybrid slot photonic waveguide. For a linear taper of pore position and radius, this leads to a Q factor of about 35000.