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Author Naify, Christina J. ♦ Rohde, Charles A. ♦ Martin, Theodore P. ♦ Nicholas, Michael ♦ Guild, Matthew D. ♦ Orris, Gregory J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ANTENNAS ♦ APERTURES ♦ DENSITY ♦ METAMATERIALS ♦ MIXERS ♦ ORBITAL ANGULAR MOMENTUM ♦ TOPOLOGY ♦ TRANSDUCERS ♦ VORTICES ♦ WAVELENGTHS
Abstract Here, we present a class of metamaterial-based acoustic vortex generators which are both geometrically simple and broadly tunable. The aperture overcomes the significant limitations of both active phasing systems and existing passive coded apertures. The metamaterial approach generates topologically diverse acoustic vortex waves motivated by recent advances in leaky wave antennas by wrapping the antenna back upon itself to produce an acoustic vortex wave antenna. We demonstrate both experimentally and analytically that this single analog structure is capable of creating multiple orthogonal orbital angular momentum modes using only a single transducer. The metamaterial design makes the aperture compact, with a diameter nearly equal to the excitation wavelength and can thus be easily integrated into high-density systems. Applications range from acoustic communications for high bit-rate multiplexing to biomedical devices such as microfluidic mixers.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-05-30
Publisher Place United States
Journal Applied Physics Letters
Volume Number 108
Issue Number 22


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