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SYPC: Photonic Crystals

SYPC 1: Symposium “Photonic Crystals” I

SYPC 1.1: Hauptvortrag

Mittwoch, 15. März 2006, 14:00–14:30, HV

Selected Nonlinear effects in photonic crystals — •F. Lederer, C. Etrich, R. Iliew, and U. Peschel — Institute of Condensed Matter Theory and Solid State Optics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany

During the past several years research in photonic crystals (PCs) has rapidly evolved. As far as applications are concerned the main emphasis is on films with two-dimensional air-hole lattices. Light confinement of Bloch waves, i.e., the realization of waveguides and resonators as key components in microphotonic circuits, is usually achieved by selecting a frequency within a band gap and introducing line or point defects into the lattice. Another PC based waveguide concept consists in coupling the resonators, i.e., coupled-resonator optical waveguide (CROW). Here 1D or 2D arranged point defects are coupled and form transmission minibands with unusual dispersion properties and adjustable bandwidth. Up to date main emphasis was on linear effects in both waveguiding structures. Because of the strong light confinement nonlinear effects are likely to appear for higher intensities. As usual one can distinguish between second and third order nonlinear effects, where the former will appear near half the band gap of III-V-semiconductors and the latter in ferroelectric PCs like Lithium niobate PC films. In the present contribution we review the formation of 1D and 2D lattice solitons in CROWs of Bragg solitons in PC waveguides with Kerr nonlinearity as well as second harmonic generation and optical parametric oscillation at point defects in PC films with quadratic nonlinearity.