Near-Field Focusing With a Corrugated Surface

In this letter, we present a theoretical device that can produce electromagnetic near-field patterns with deep subwavelength resolution. The device consists of a single slit in a corrugated metallic surface. The surface exhibits a nonperiodic series of grooves symmetrically positioned about a wavegu...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2009, Vol.8, p.421-424
Main Authors: Imani, M.F., Grbic, A.
Format: Article
Language:English
Subjects:
Antennas
Conductive films
Corrugated surface
Corrugated surfaces
Corrugating
Detection
Devices
diffraction limit
Electromagnetic waveguides
Focusing
Grooves
metamaterials
near field
Optical diffraction
Optical films
Optical surface waves
Optical waveguides
Plasmons
Slits
Surface impedance
Surface waves
Waveguides
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Summary:In this letter, we present a theoretical device that can produce electromagnetic near-field patterns with deep subwavelength resolution. The device consists of a single slit in a corrugated metallic surface. The surface exhibits a nonperiodic series of grooves symmetrically positioned about a waveguide-fed slit. A procedure for designing such a device is described in detail. The electromagnetic response of the corrugated surface is shown to be as theoretically predicted, producing a subwavelength focal pattern with a null-to-null beamwidth of lambda/10. In addition, the effect of losses on the performance of the device is studied. Finally, it is shown that the device can be impedance-matched to its waveguide feed. Such devices will find use in noncontact sensing and near-field probing applications.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2009.2021495