Holography with high-power CW coherent terahertz source: optical components, imaging, and applications

Choporova, Yulia Yu.; Knyazev, B. A.; Pavelyev, V. S.

doi:10.37188/lam.2022.031

Cited by 9 publications

(5 citation statements)

References 103 publications

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“…This possibility is crucial for such applications as lidars [ 3 , 4 ], terahertz telecommunication systems with MDM [ 3 ], remote control systems for fundamental research, and so forth. In [ 67 ], it was discussed that a relatively high ratio between terahertz range wavelength and optical material structuring resolution opens an opportunity to create optical elements forming terahertz coherent fields with pre-given intensity, phase, mode content as well as polarization state.…”

Section: Discussionmentioning

confidence: 99%

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Pavelyev

Хонина

Degtyarev

et al. 2023

Sensors

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Coherent terahertz beams with radial polarization of the 1st, 2nd, and 3rd orders have been generated with the use of silicon subwavelength diffractive optical elements (DOEs). Silicon elements were fabricated by a technology similar to the technology used before for the fabrication of DOEs forming laser terahertz beams with pre-given mode content. The beam of the terahertz Novosibirsk Free Electron Laser was used as the illuminating beam. The experimental results are in good agreement with the results of the computer simulation.

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Section: Discussionmentioning

confidence: 99%

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Pavelyev

Хонина

Degtyarev

et al. 2023

Sensors

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“…In particular, THz vortex generators play an essential role in numerous applications: in the detection of magnetic properties, [28] quantum condensate control, wireless communications, [29][30][31] generation of plasmon polaritons, [32][33][34] THz imaging, and ghost imaging. [35][36][37] The importance of vortex comes from the fact that these beams carry orbital angular momentum (OAM), which characterizes the composition of vortex modes in the beam.…”

Section: Introductionmentioning

confidence: 99%

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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“…[17][18][19] The Talbot effect has also been observed during OV diffraction on a periodic grating. [8,[20][21][22][23][24][25] A distinct feature of the effect is the self-healing, which is the restoring of the periodic distribution of intensity behind a periodic object with a local violation of the periodicity of the structure. [26,27] Fork-shaped gratings are characterized by the presence of a dislocation in a spatially periodic structure, which makes it possible to consider them as a special case of the above-mentioned periodic lattices with a local violation of the periodicity.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Talbot Effect under Fresnel Diffraction at a Fork‐Shaped Grating

et al. 2023

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The near‐field effect of diffraction image self‐reproduction or self‐imaging of a periodic grating illuminated by quasi‐monochromatic wave is well‐known as the Talbot effect. Introducing a dislocation to a periodic structure provides a fork‐shaped modulation of the phase/amplitude, which produces discrete diffraction pattern in a far‐field consisting of optical vortices. In this paper, Fresnel diffraction at amplitude fork‐shaped grating is theoretically and experimentally studied. The coexistence of spatial ordering and local violation of translational symmetry of the structure manifests itself in a strict diffraction pattern consisting of optical vortices in the far‐field, which is shown to be accompanied by formation of a spatially ordered intensity distribution in the near‐field, reminiscent the Talbot carpets for periodic structures. These results demonstrate the first evidence of Talbot effect occurred under light diffraction at fork‐shaped gratings, being promising for deep understanding of near‐field singular optics phenomena.

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Holography with high-power CW coherent terahertz source: optical components, imaging, and applications

Cited by 9 publications

References 103 publications

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

Subwavelength Diffractive Optical Elements for Generation of Terahertz Coherent Beams with Pre-Given Polarization State

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

Unveiling Talbot Effect under Fresnel Diffraction at a Fork‐Shaped Grating

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