Nondiffractive Subwavelength Wave Beams in a Medium with Externally Controlled Anisotropy

T. Schneider, A. A. Serga, A. V. Chumak, C. W. Sandweg, S. Trudel, S. Wolff, M. P. Kostylev, V. S. Tiberkevich, A. N. Slavin, and B. Hillebrands
Phys. Rev. Lett. 104, 197203 – Published 13 May 2010

Abstract

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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  • Received 19 November 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.197203

©2010 American Physical Society

Authors & Affiliations

T. Schneider1, A. A. Serga1, A. V. Chumak1, C. W. Sandweg1, S. Trudel1, S. Wolff2, M. P. Kostylev3, V. S. Tiberkevich4, A. N. Slavin4, and B. Hillebrands1

  • 1Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
  • 2Nano + Bio Center, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
  • 3School of Physics, M013, University of Western Australia, Crawley, WA 6009, Australia
  • 4Department of Physics, Oakland University, Rochester, Michigan 48309, USA

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Vol. 104, Iss. 19 — 14 May 2010

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