| Original Articles |
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Optical Beams in Media with Spatial Dispersion |
| GUO Qi |
| Institute of Quantum Electronics, South China Normal University, Guangzhou 510631 |
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| Cite this article: |
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GUO Qi 2003 Chin. Phys. Lett. 20 64-67 |
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Abstract We theoretically predict a novel phenomenon of the diffraction-free propagation of the paraxial optical beam in the isotropic or cubic linear medium with spatial dispersion. Under the weak spatial dispersion condition, the paraxial wave equation is derived, in which there is the diffraction term with the coefficient G that depends on the compensation between the classic diffraction and spatial dispersion. Near the exciton dipole absorption line, we can have Γ = 0, then the beam propagates diffraction-freely, and its shape keeps unchangeable. Discussed are also the physical mechanism and the possible experimental candidates of crystals for the phenomenon.
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| Keywords:
42.25.Bs
71.35.Cc
71.35.-y
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Published: 01 January 2003
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| PACS: |
42.25.Bs
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(Wave propagation, transmission and absorption)
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71.35.Cc
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(Intrinsic properties of excitons; optical absorption spectra)
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71.35.-y
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(Excitons and related phenomena)
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