Tunable flat-band slow light via contra-propagating cavity modes in twin coupled microresonators
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 mult...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/79773 http://hdl.handle.net/10220/7984 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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