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Tunable flat-band slow light via contra-propagating cavity modes in twin coupled microresonators |
JOSA B, Vol. 29, Issue 5, pp. 924-933 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000924
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Abstract
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.
© 2012 Optical Society of America
OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators
(230.7020) Optical devices : Traveling-wave devices
(230.4555) Optical devices : Coupled resonators
ToC Category:
Integrated Optics
History
Original Manuscript: September 27, 2011
Revised Manuscript: January 6, 2012
Manuscript Accepted: January 6, 2012
Published: April 6, 2012
Citation
Thomas Y. L. Ang and Nam Quoc Ngo, "Tunable flat-band slow light via contra-propagating cavity modes in twin coupled microresonators," J. Opt. Soc. Am. B 29, 924-933 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-5-924
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