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Proceedings Paper

High-index-contrast, photonic-band-edge waveguides for tunable time delays
Author(s): M. L. Povinelli; Steven G. Johnson; J. D. Joannopoulos
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Paper Abstract

We describe the use of high-index-contrast, photonic-crystal wavegides for tunable time delays. The waveguide is designed such that the operating frequency is near a photonic band edge. In this slow light region, a small change in index yields a large change in group velocity, and consequently in time delay. Figures of merit for tunable time delay devices are introduced, including sensitivity, length, and dispersion. We show that a simple quadratic band model is a good predictor of the figures of merit for realistic, 3D, high-index-contrast structures. By cascading two grated waveguides, we can obtain a flat tunable time delay across the operating bandwidth.

Paper Details

Date Published: 12 September 2005
PDF: 9 pages
Proc. SPIE 5926, Tuning the Optical Response of Photonic Bandgap Structures II, 59260D (12 September 2005); doi: 10.1117/12.617836
Show Author Affiliations
M. L. Povinelli, Massachusetts Institute of Technology (United States)
Stanford Univ. (United States)
Steven G. Johnson, Massachusetts Institute of Technology (United States)
J. D. Joannopoulos, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 5926:
Tuning the Optical Response of Photonic Bandgap Structures II
Philippe M. Fauchet; Paul V. Braun, Editor(s)

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