| Slow light and chromatic temporal dispersion in photonic crystal waveguides using femtosecond time of flight. | |
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MedLine Citation:
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PMID: 16486307 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We report time-of-flight experiments on photonic-crystal waveguide structures using optical Kerr gating of a femtosecond white-light supercontinuum. These photonic-crystal structures, based on engineered silicon-nitride slab waveguides, possess broadband low-loss guiding properties, allowing the group velocity dispersion of optical pulses to be directly tracked as a function of wavelength. This dispersion is shown to be radically disrupted by the spectral band gaps associated with the photonic-crystal periodicity. Increased time-of-flight effects, or "slowed light," are clearly observed at the edges of band gaps in agreement with two-dimensional plane-wave theoretical models of group velocity dispersion. A universal model for slow light in such photonic crystals is proposed, which shows that slow light is controlled predominantly by the detuning from, and the size of, the photonic band gaps. Slowed light observed up to time delays of approximately 1 ps, corresponds to anomalous dispersion of approximately 3.5 ps/nm per mm of the photonic crystal structure. From the decreasing intensity of time-gated slow light as a function of time delay, we estimate the characteristic losses of modes which are guided in the spectral proximity of the photonic band gaps. |
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Authors:
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C E Finlayson; F Cattaneo; N M B Perney; J J Baumberg; M C Netti; M E Zoorob; M D B Charlton; G J Parker |
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Publication Detail:
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Type: Journal Article Date: 2006-01-30 |
Journal Detail:
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Title: Physical review. E, Statistical, nonlinear, and soft matter physics Volume: 73 ISSN: 1539-3755 ISO Abbreviation: Phys Rev E Stat Nonlin Soft Matter Phys Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2006-02-20 Completed Date: 2006-06-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101136452 Medline TA: Phys Rev E Stat Nonlin Soft Matter Phys Country: United States |
Other Details:
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Languages: eng Pagination: 016619 Citation Subset: - |
Affiliation:
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School of Physics & Astronomy, University of Southampton, Southampton SO17 1BJ, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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