Generating Evanescent Bessel Beams Using Near-Field Plates

We present a near-field plate that can generate an evanescent Bessel beam. The metallic plate consists of nonperiodic concentric corrugations that surround a coaxially fed aperture. The design procedure for such a device is outlined. The designed plate is simulated using a full-wave electromagnetic...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2012-07, Vol.60 (7), p.3155-3164
Main Authors: Imani, M. F., Grbic, A.
Format: Article
Language:English
Subjects:
Antennas
Applied classical electromagnetism
Beams (radiation)
Bessel beams
Corrugated surfaces
Data storage
Design engineering
Devices
Diffraction
Electromagnetic wave propagation, radiowave propagation
Electromagnetism
electron and ion optics
evanescent waves
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Impedance
Mathematical model
metamaterials
Optical surface waves
Physics
Plates
Solvers
Surface impedance
Surface waves
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Summary:We present a near-field plate that can generate an evanescent Bessel beam. The metallic plate consists of nonperiodic concentric corrugations that surround a coaxially fed aperture. The design procedure for such a device is outlined. The designed plate is simulated using a full-wave electromagnetic solver and is shown to produce an evanescent Bessel beam, thereby verifying its design and operation. The performance of the near-field plate is contrasted against a coaxial probe and a near-field plate designed to produce an Airy focal pattern with the same beamwidth. Such a device, capable of producing evanescent Bessel beams, will find applications in near-field probing/imaging systems, data storage, and biomedical devices.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2012.2196947