Abstract
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.
Original language | English (US) |
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Article number | 6193139 |
Pages (from-to) | 3155-3164 |
Number of pages | 10 |
Journal | IEEE Transactions on Antennas and Propagation |
Volume | 60 |
Issue number | 7 |
DOIs | |
State | Published - 2012 |
Externally published | Yes |
Keywords
- Bessel beams
- evanescent waves
- metamaterials
- surface impedance
- surface waves
ASJC Scopus subject areas
- Electrical and Electronic Engineering