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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 29, Iss. 8 — Aug. 1, 2012
  • pp: 2053–2059

Great optical buffering capacity for optical delay line and extraordinary optical reflection and mode conversion with extremely weak dielectric perturbations based on circular Bragg resonators

Ken Liu, Wei Min Ye, Wei Xu, Xiao Dong Yuan, Zhi Hong Zhu, and Chun Zeng  »View Author Affiliations

JOSA B, Vol. 29, Issue 8, pp. 2053-2059 (2012)

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Circular Bragg resonators (CBRs) are analyzed in both the frequency domain and the time domain based on the scattering matrix method and the numerical model. The CBR with the same size as a dielectric ring can be designed to have denser resonant mode distributions in the frequency domain, and the expansion of the slow light band is imposed by the combination of multiresonant modes. Thus the expansion is independent of group velocity and is not limited by the delay-bandwidth product constraint in static photonic structures, which is deduced for a single resonant mode. Hence, the CBR can store more bits than a dielectric ring. For certain parameters, clockwise (CW) and counterclockwise (CCW) modes in the CBR are quite sensitive to dielectric perturbations, which are weak enough that they have little effect on the CW mode and CCW mode in a dielectric ring. When light propagates along a line waveguide coupled with the CBR, and if there are weak dielectric perturbations in the CBRs, extraordinary reflections could be produced and there exists strong coupling and conversion between CW and CCW modes in the CBR. The optical property indicates that extremely weak dielectric perturbations in the CBR play an important role in mode conversion. These unique properties of CBRs may find applications in the design of practical optical delay line buffers, and they also provide a new method to achieve light control by mode conversion in passive optical resonators.

© 2012 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(230.3120) Optical devices : Integrated optics devices
(230.4555) Optical devices : Coupled resonators

ToC Category:
Optical Devices

Original Manuscript: January 3, 2012
Revised Manuscript: May 17, 2012
Manuscript Accepted: June 2, 2012
Published: July 19, 2012

Ken Liu, Wei Min Ye, Wei Xu, Xiao Dong Yuan, Zhi Hong Zhu, and Chun Zeng, "Great optical buffering capacity for optical delay line and extraordinary optical reflection and mode conversion with extremely weak dielectric perturbations based on circular Bragg resonators," J. Opt. Soc. Am. B 29, 2053-2059 (2012)

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