期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.197203
关键词
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资金
- DFG [Graduiertenkolleg 792, SE 1771/1-1]
- Australian Research Council
- National Science Foundation [ECCS 0653901]
- U.S. Army TARDEC, RDECOM [W56HZW-09-PL564]
- AvH foundation
We predict and experimentally demonstrate that in a medium with externally induced anisotropy, a wave source of a sufficiently small size can excite practically nondiffractive wave beams with stable subwavelength transverse aperture. The direction of beam propagation is controlled by rotating the induced anisotropy axis. Nondiffractive wave beam propagation, reflection, and scattering, as well as beam steering have been directly observed by optically probing dipolar spin waves in yttrium iron garnet films, where the uniaxial anisotropy was created by an in-plane bias magnetic field.
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