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Terahertz plasmonic Bessel beamformer
9. J. Salo, J. Meltaus, E. Noponen, J. Westerholm, M. M. Salomaa, A. Lönnqvist, J. Säily, J. Häkli, J. Ala-Laurinaho, and A. V. Räisänen, Electron. Lett. 37, 834 (2001).
17. N. Yu, Q. J. Wang, M. A. Kats, J. A. Fan, S. P. Khanna, L. Li, A. G. Davies, E. H. Linfield, and F. Capasso, Nat. Mater. 9, 730 (2010).
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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.
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