期刊
OPTICS EXPRESS
卷 18, 期 19, 页码 20170-20182出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.020170
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资金
- MOE Cultivation Fund of the Key Scientific and Technical Innovation Project [708022]
- NSFC [90922030, 10904077, 10804054]
- 111 project [B07013]
- 973 program [2007CB307002]
- CNKBRSF [2006CB921703]
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. (C) 2010 Optical Society of America
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