Dispersive properties of photonic crystal waveguide resonators

✍ Scribed by Sünner, T. ;Gellner, M. ;Scholz, M. ;Löffler, A. ;Kamp, M. ;Forchel, A.

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 887 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200776419

✦ Synopsis

Abstract

We have investigated the group delay and the dispersion of light propagating through photonic crystal (PhC) resonators defined in 240 nm thick GaAs membranes. The design of the resonators is based on a PhC heterostructure, which combines waveguide sections with different lattice constants along a PhC waveguide. The measurements were performed by detecting the phase shift of a microwave signal which was modulated onto the light of a tunable laser source. The group delay was found to increase linearly with the quality factor of the resonator, in good agreement with the prediction of a model where the PhC resonator is replaced by an equivalent Fabry–Perot resonator. An alternative analysis of the measurements was performed using a Hilbert transform approach. A maximum group delay of 132 ps was observed for a resonator with a quality factor of 82000. The overall length of this resonator was 10.4 μm, resulting in a propagation speed of 7.88 × 10^4^ m/s (c/3800). The maximum dispersion of the resonator was around 1.7 ns/nm, which is equivalent to 100 km of standard optical fiber. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)