Journal ArticleDOI
Generation of arbitrary order Bessel beams via 3D printed axicons at the terahertz frequency range.
TLDR
This 3D-printing-based Bessel beam generation technique is useful not only for THz imaging systems with zero-order Bessel beams but also for future orbital-angular-momentum-based THz free-space communication with higher-orderBessel beams.Abstract:
We present the generation of arbitrary order Bessel beams at 0.3 THz through the implementation of suitably designed axicons based on 3D printing technology. The helical axicons, which possess thickness gradients in both radial and azimuthal directions, can convert the incident Gaussian beam into a high-order Bessel beam with spiral phase structure. The evolution of the generated Bessel beams are characterized experimentally with a three-dimensional field scanner. Moreover, the topological charges carried by the high-order Bessel beams are determined by the fork-like interferograms. This 3D-printing-based Bessel beam generation technique is useful not only for THz imaging systems with zero-order Bessel beams but also for future orbital-angular-momentum-based THz free-space communication with higher-order Bessel beams.read more
Citations
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Journal ArticleDOI
Tutorial: Terahertz beamforming, from concepts to realizations
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Beams of photons with nonzero projections of orbital angular momenta: new results
Boris A. Knyazev,V.G. Serbo +1 more
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Revisiting Orbital Angular Momentum Beams: Fundamentals, Reflectarray Generation, and Novel Antenna Applications
TL;DR: In this paper, a reflectarray antenna is used to generate and manipulate OAM-carrying laser beams at radio frequency (RF) and to tailor the antennas' far-field characteristics, such as twisted wavefront and annular-shaped intensity pattern.
References
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Journal ArticleDOI
Cutting-edge terahertz technology
TL;DR: An overview of the status of the terahertz technology, its uses and its future prospects are presented in this article, with a focus on the use of the waveband in a wide range of applications.
Journal ArticleDOI
Exact solutions for nondiffracting beams. I. The scalar theory
TL;DR: In this paper, exact nonsingular solutions of the scalar-wave equation for beams that are non-diffracting were presented, which means that the intensity pattern in a transverse plane is unaltered by propagating in free space.
Journal ArticleDOI
Accelerating finite energy Airy beams
TL;DR: This work investigates the acceleration dynamics of quasi-diffraction-free Airy beams in both one- and two-dimensional configurations and shows that this class of finite energy waves can retain their intensity features over several diffraction lengths.
Journal ArticleDOI
Bessel beams: Diffraction in a new light
David McGloin,Kishan Dholakia +1 more
TL;DR: In this article, the theoretical foundation of the Bessel beam is described and various experiments that make use of Bessel beams are discussed: these cover a wide range of fields including non-linear optics, where the intense central core of the bessel beam has attracted interest; short pulse non-diffracting fields; atom optics, and optical manipulation where the reconstruction properties of the beam enable new effects to be observed that cannot be seen with Gaussian beams.
Journal ArticleDOI
High-capacity millimetre-wave communications with orbital angular momentum multiplexing
Yan Yan,Guodong Xie,Martin P. J. Lavery,Hao Huang,Nisar Ahmed,Changjing Bao,Yongxiong Ren,Yinwen Cao,Long Li,Zhe Zhao,Andreas F. Molisch,Moshe Tur,Miles J. Padgett,Alan E. Willner +13 more
TL;DR: This work demonstrates a 32-Gbit’s−1 millimetre-wave link over 2.5 metres with a spectral efficiency of ~16 bit s− 1 Hz−1 using four independent orbital–angular momentum beams on each of two polarizations, and shows an 8-Gbits−1 link containing two orbital angular momentum beams with crosstalk less than −12.5 dB.