Light trapping and releasing in side-coupled microresonator structures with asymmetric cavity–waveguide coupling
✍ Scribed by J.J. Xiao; K.W. Yu
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 547 KB
- Volume
- 281
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
In this work we analyze the waveguiding properties of a kind of side-coupled microresonator structures with asymmetric coupling. The mismatch in the two resonator-waveguide couplings plays a similar role of loss and gain in the constituent material but offers much flexible controllability, in terms of achieving fast-and slow-light. Using a generalized transfer matrix formalism, we determine the criteria for achieving subluminal and superluminal pulse propagation in these structures. Moreover, we propose a scheme for light trapping and releasing by dynamical control of the resonator-waveguide coupling strengths. Time-domain numerical simulations with feasible physical parameters for the switching operation are presented.