Terahertz plasmonic Bessel beamformer

Yasuaki Monnai, David Jahn, Withawat Withayachumnankul, Martin Koch, Hiroyuki Shinoda

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


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.

Original languageEnglish
Article number021101
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 2015 Jan 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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