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

Petrov, Nikolay V.; Sokolenko, Bogdan V.; Kulya, Maksim S.; Gorodetsky, Andrei; Chernykh, Aleksey V.

doi:10.37188/lam.2022.043

Cited by 26 publications

(19 citation statements)

References 202 publications

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“…This section describes the applicability of THz PTDH for numerical and experimental studies of achromatic vortex beam modulators. We will demonstrate the capabilities of the PTDH on the example of multilayer quartz wave plates with a certain achromaticity in wavefront retardation in the broad THz range, which have been mentioned in the first paper [12] of this paired set. However, we note that we propose our technique not only as a method for the quartz plate-based beam shapers design, but for any componentbased beam shapers, with any known spectral amplitude and phase characteristics, either full or partially achromatic, such as those reviewed in the first paper of this paired set [12].…”

Section: Theoretical Description and Methodsmentioning

confidence: 99%

“…We will demonstrate the capabilities of the PTDH on the example of multilayer quartz wave plates with a certain achromaticity in wavefront retardation in the broad THz range, which have been mentioned in the first paper [12] of this paired set. However, we note that we propose our technique not only as a method for the quartz plate-based beam shapers design, but for any componentbased beam shapers, with any known spectral amplitude and phase characteristics, either full or partially achromatic, such as those reviewed in the first paper of this paired set [12]. The eligible components can exploit the total internal reflection principle, liquid crystals, metasurfaces and on others principles (such as twisted fibers [34], if they are adapted for the THz range).…”

Section: Theoretical Description and Methodsmentioning

confidence: 99%

“…A vast variety of polarisation components can be used as constituents of the beam shapers, and we reviewed a stateof-the-art of these components in the first paper [12] of this paired set. Detailed analysis of achromatic components revealed numerous limitations of their applicability, mostly due to non-perfect achromaticity and geometric limitations.…”

Section: Iixmentioning

confidence: 99%

“…Thus, the resulting director's rotation with respect to the plate can be written as the following sum: Further extrapolating the idea of designing multilayered wave plates introducing spectrally-isotropic response for terahertz pulses, we propose the design of an achromatic q-plate created from eight sectors of a quartz birefringent achromatic HWP ( = ) as shown in Fig. 3 (c) in the first paper [12] of this paired set. Being located in the type I beam shaping scheme (Fig.…”

Section: Jones Matrix Formalism For the Achromatic Wave Plates Designmentioning

confidence: 99%

“…In the first paper [12] of this paired set we provided a comprehensive review of the perspectives for vector and vortex THz beam shaping with geometric phase effect [13]. We have outlined two main approaches characterised by the different order of the main elements in the shaper.…”

Section: Introductionmentioning

confidence: 99%

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Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

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In this paper, we demonstrate the capabilities of the terahertz pulse time-domain holography in visualisation, simulation, and assessment of broadband THz vortex beam formation dynamics upon its shaping by elements of beam converter, and further propagation and manipulation. By adding Jones matrix formalism to describe broadband optical elements, we highlight the differences in the spatial-spectral and spatio-temporal structure of the formed vortex and vector beams dependence on the modulator used and visualise their modal features. The influence of diffraction field structure from each element in the broadband vortex modulator is revealed in numerical simulation and the formed beams are analysed against the simplified Laguerre-Gaussian beam model.

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Section: Theoretical Description and Methodsmentioning

confidence: 99%

Section: Theoretical Description and Methodsmentioning

confidence: 99%

Section: Iixmentioning

confidence: 99%

Section: Jones Matrix Formalism For the Achromatic Wave Plates Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

gxjzz

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Expanding THz Vortex Generation Functionality with Advanced Spiral Zone Plates Based on Single‐Walled Carbon Nanotube Films

Radivon,

Katyba,

Raginov

et al. 2024

Advanced Optical Materials

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Optical elements based on nanomaterials are becoming major avenues to satisfy the technological requirements of compact, lightweight, and tunable elements of the emerging terahertz (THz) field. A new generation of diffractive components integrating specific geometry with additional features (flexibility, stretchability, rotation, and other approaches for tuning properties) extends the functionality of wavefront control. Here, an innovative approach is demonstrated to control the THz wavefront via a layered composition of spiral zone plates (SZPs) with tunable mutual orientation and scaling. As a proof of concept, the SZP is designed using Laguerre‐Gauss mode analysis with further fabrication and experimental characterization of the resultant vortex beams. For each single SZP, a flexible element is proposed based on a thin film of single‐walled carbon nanotubes deposited on a stretchable substrate. Thus, this diffraction element can be tuned not only by rotation (along the azimuthal direction), but also by its stretching (in the radial direction). The spatial tuning of the developed SZPs (spiral zone plates) opens up an efficient, convenient, and highly customizable approach for the manipulation of vortex beams.

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Generating Angular-Varying Time Delays of THz Pulses via Direct Space-to-Time Mapping of Metasurface Structures

Elias,

Sideris,

McDonnell

et al. 2023

ACS Appl. Opt. Mater.

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We experimentally demonstrate the generation of double terahertz (THz) pulses with tailored angular-dependent time delays from a nonlinear metasurface excited by a near-infrared femtosecond pulse. The tailored temporal properties of the generated pulses emerge from a direct mapping of the nonlinear spatial response of the metasurface to the emitted THz temporal profile. We utilize the Pancharatnam-Berry phase to implement symmetric and antisymmetric metasurface configurations and show that the emitted patterns present spatiotemporal “X-shaped” profiles after collimation by a parabolic mirror, with angular-dependent pulse delays corresponding to the intended design. In addition, we show that the addition of polarization multiplexing presents the opportunity to achieve a full range of elliptical THz polarizations. Double pulse generation and spatiotemporal shaping of THz waves in general show potential for THz spectroscopy and molecular dynamics applications, particularly in pump–probe experiments.

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

Cited by 26 publications

References 202 publications

Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Expanding THz Vortex Generation Functionality with Advanced Spiral Zone Plates Based on Single‐Walled Carbon Nanotube Films

Generating Angular-Varying Time Delays of THz Pulses via Direct Space-to-Time Mapping of Metasurface Structures

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