期刊
OPTICS LETTERS
卷 33, 期 19, 页码 2200-2202出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002200
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资金
- Hong Kong SAR Government
- CNKBRSF [2006CB921706]
- Shanghai Science and Technology Cornmittee [06PJ14006]
- Shanghai Education Committee
- National Natural Science Foundation of China (NNSFC) [10604014]
We exploit theoretically the occurrence and tunability of photonic Bloch oscillations (PBOs) in one-dimensional photonic crystals (PCs) containing nonlinear composites. Because of the enhanced third-order nonlinearity (Kerr-type nonlinearity) of composites, photons undergo oscillations inside tilted photonic bands, which are achieved by the application of graded external-pump electric fields on such PCs, varying along the direction perpendicular to the surface of layers. The tunability of PBOs (including amplitude and period) is readily achieved by changing the field gradient. With an appropriate graded pump ac or dc electric field. terahertz PBOs can appear and cover a terahertz hand in an electromagnetic spectrum. (C) 2008 Optical Society of America
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