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Phys Rev Lett. 2010 May 14;104(19):197203. Epub 2010 May 13.

Nondiffractive subwavelength wave beams in a medium with externally controlled anisotropy.

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Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universit├Ąt Kaiserslautern, 67663 Kaiserslautern, Germany.


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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