Interference enabled binary data encoding within broadband uniformly topologically charged terahertz beams

We present a holographic detection module to measure the spatially resolved distribution of pulsed terahertz field in a single scan by a motorized translation stage, responsible for the time delay. All mounts of the optical elements of the module are easily reproduced by 3D printing and attached to the optical cage system. The latter greatly simplifies the measurement procedure, allowing the experimenter to move and adjust the detection system as a single device. The developed mounts are made universal and can be used in other setups. We have made 3D models available as open-source hardware. The module is based on an electro-optical detection scheme with wide-aperture ZnTe crystal, crossed polarizers, and a matrix photodetector. The validation of its operability was performed with two experiments to measure the spatial distribution of the unperturbed field from the generator and the vortex field formed by the spiral phase plate. Optical vortices with multiple topological charges of 2–4 were detected on spectral components in the range from 0.3 to 1.1 THz. In addition, we have detailed the alignment process of terahertz imaging systems.

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Design of broadband terahertz vector and vortex beams: I. Review of materials and components

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

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In this paper, we review the existing approaches for vortex and vector beam shaping and generation in the terahertz frequency range. The particular focus of this review is on the possibility of homogeneous topological charge formation in the ultra-wide spectral interval inherent to ultrashort terahertz pulses. We review the available materials and components, analyse proposed and potentially possible solutions for broadband terahertz vortex and vector beam shaping, compare all developed approaches, and put forward a unified concept for constructing passive shapers of such beams from the existing component base.

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Interference enabled binary data encoding within broadband uniformly topologically charged terahertz beams

Abstract: This work demonstrates the encoding principle for wave trains consisting of interfering uniformly charged Laguerre-Gaussian terahertz beams carrying unitary and zero topological charges. Optimization of the receiving aperture and threshold for a binary encoding outcome is presented.

Cited by 3 publications

References 3 publications

Characterizing the temporal rotation and radial twist of the interference pattern of vortex beams

Characterizing the temporal rotation and radial twist of the interference pattern of vortex beams

Open-source 3D-printed terahertz pulse time-domain holographic detection module

Design of broadband terahertz vector and vortex beams: I. Review of materials and components

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