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

Andrey A. Sukhorukov; Sangwoo Ha; Andrei V. Lavrinenko; Yuri S. Kivshar

doi:10.1117/12.848666

11 February 2010 Coupled cavities and band-edge slow-light effects in periodic waveguides

Andrey A. Sukhorukov, Sangwoo Ha, Andrei V. Lavrinenko, Yuri S. Kivshar

Proceedings Volume 7612, Advances in Slow and Fast Light III; 76120M (2010) https://doi.org/10.1117/12.848666
Event: SPIE OPTO, 2010, San Francisco, California, United States

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.

Citation Download Citation

Andrey A. Sukhorukov, Sangwoo Ha, Andrei V. Lavrinenko, and Yuri S. Kivshar "Coupled cavities and band-edge slow-light effects in periodic waveguides", Proc. SPIE 7612, Advances in Slow and Fast Light III, 76120M (11 February 2010); https://doi.org/10.1117/12.848666

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