Terahertz plasmonic Bessel beamformer

We experimentally demonstrate terahertz Bessel beamforming based on the concept of plasmonics. The proposed planar structure is made of concentric metallic grooves with a subwavelength spacing that couple to a point source to create tightly confined surface waves or spoof surface plasmon polaritons....

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Bibliographic Details
Published in:Applied physics letters 2015-01, Vol.106 (2)
Main Authors: Monnai, Yasuaki, Jahn, David, Withayachumnankul, Withawat, Koch, Martin, Shinoda, Hiroyuki
Format: Article
Language:English
Subjects:
Applied physics
Beamforming
Beams (radiation)
BESSEL FUNCTIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Grooves
LENSES
PERIODICITY
Planar structures
Plasmonics
PLASMONS
POINT SOURCES
Polaritons
POLARONS
SOLIDS
SPACE
SPECTROSCOPY
Surface waves
SURFACES
THZ RANGE
WAVE PROPAGATION
WAVELENGTHS
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Summary:We experimentally demonstrate terahertz Bessel beamforming based on the concept of plasmonics. The proposed planar structure is made of concentric metallic grooves with a subwavelength spacing that couple to a point source to create tightly confined surface waves or spoof surface plasmon polaritons. Concentric scatterers periodically incorporated at a wavelength scale allow for launching the surface waves into free space to define a Bessel beam. The Bessel beam defined at 0.29 THz has been characterized through terahertz time-domain spectroscopy. This approach is capable of generating Bessel beams with planar structures as opposed to bulky axicon lenses and can be readily integrated with solid-state terahertz sources.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4905445