| Linear discrete diffraction and transverse localization of light in two-dimensional backbone lattices. | |
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MedLine Citation:
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PMID: 20940908 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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We study the linear discrete diffraction characteristics of light in two-dimensional backbone lattices. It is found that, as the refractive index modulation depth of the backbone lattice increases, high-order band gaps become open and broad in sequence, and the allowed band curves of the Floquet-Bloch modes become flat gradually. As a result, the diffraction pattern at the exit face converges gradually for both the on-site and off-site excitation cases. Particularly, when the refractive index modulation depth of the backbone lattice is high enough, for example, on the order of 0.01 for a square lattice, the light wave propagating in the backbone lattice will be localized in transverse dimension for both the on-site and off-site excitation cases. This is because only the first several allowed bands with nearly flat band curves are excited in the lattice, and the transverse expansion velocities of the Floquet-Bloch modes in these flat allowed bands approach to zero. Such a linear transverse localization of light may have potential applications in navigating light propagation dynamics and optical signal processing. |
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Authors:
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Yiling Qi; Guoquan Zhang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Optics express Volume: 18 ISSN: 1094-4087 ISO Abbreviation: Opt Express Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-10-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101137103 Medline TA: Opt Express Country: United States |
Other Details:
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Languages: eng Pagination: 20170-82 Citation Subset: IM |
Affiliation:
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The MOE Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin, China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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