Tunable flat-band slow light via contra-propagating cavity modes in twin coupled microresonators
Ang, Thomas Y. L.
Ngo, Nam Quoc
Date of Issue2012
School of Electrical and Electronic Engineering
Photonics Research Centre
We utilize the contra-propagating cavity modes that arise from the evanescent coupling of both the resonators to the bus waveguide in a twin coupled traveling-wave microresonators (MRs) system to generate flat-band slow light (SL). The contra-propagating cavity modes will generate multipeaks in the resonance spectra. Flat-band SL can be generated if such multipeaks become undistinguishable and merge into one single broadened peak that is maximally flat when the inter-resonator coupling strength is optimized relative to the resonators-to-bus-waveguide coupling strengths. The bandwidth and the group delay can be tuned by adjusting the coupling strengths. It is shown that the delay-bandwidth products of the output light at the through (reflection) port are 3- to 12-fold (6- to 24-fold) higher than that of conventional MR-based SL systems. Fabrication tolerance and cavity losses analyses have also revealed that the proposed scheme is rather robust to the fabrication errors and limitations of current state-of-the-art semiconductor processing technology.
Journal of the optical society of America B
© 2012 Optical Society of America. This paper was published in Journal of the Optical Society of America B and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following DOI: [http://dx.doi.org/10.1364/JOSAB.29.000924]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.