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Proceedings Paper

Coupled cavities and band-edge slow-light effects in periodic waveguides
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Paper Abstract

We demonstrate, theoretically and experimentally, that the modes of coupled cavities created in periodic waveguides can depend critically on the lateral shift between the cavities. In the absence of such shift, the modes feature symmetric or antisymmetric profiles, and their frequency splitting generally increases as the cavities are brought closer. We show that the longitudinal shift enables flexible control over the fundamental modes, which frequency detuning can be reduced down to zero. Our coupled-mode theory analysis reveals an intrinsic link between the mode tuning and the transformation of slow-light dispersion at the photonic band-edge. We illustrate our approach through direct numerical modelling of cavities created in arrays of dielectric rods, nanobeam structures, and two-dimensional photonic-crystal waveguides. We also present experimental results for coupled rod cavities confirming our predictions.

Paper Details

Date Published: 11 February 2010
PDF: 9 pages
Proc. SPIE 7612, Advances in Slow and Fast Light III, 76120M (11 February 2010); doi: 10.1117/12.848666
Show Author Affiliations
Andrey A. Sukhorukov, The Australian National Univ. (Australia)
Sangwoo Ha, The Australian National Univ. (Australia)
Andrei V. Lavrinenko, Technical Univ. of Denmark (Denmark)
The Australian National Univ. (Australia)
Yuri S. Kivshar, The Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 7612:
Advances in Slow and Fast Light III
Selim M. Shahriar; Philip R. Hemmer, Editor(s)

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