Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

Miyamoto, Katsuhiko; Sano, Koki; Miyakawa, Takahiro; Niinomi, Hiromasa; Toyoda, Kohei; Vallés, Adam; Omatsu, Takashige

doi:10.1364/oe.27.031840

Cited by 39 publications

(23 citation statements)

References 72 publications

(70 reference statements)

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“…The selection rules we have established are in agreement with Refs. [28,29] for the DFG case and also in agreement with Refs. [30,31] for the OR case, where it has been experimentally demonstrated that, unless further modifications to the optical system are performed, the expectation value for the OAM of the OR field is zero.…”

supporting

confidence: 91%

“…The authors of Refs. [28,29] demonstrate that in their DFG experimental conditions, the transduction of OAM occurs under the conservation of OAM. Concerning this Letter, we have found that it is related to the conservation of the total angular momentum; therefore, our result is a generalization in this sense, because it does not apply only to the case of linear polarization of the pump.…”

mentioning

confidence: 98%

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Selection rules for the orbital angular momentum of optically produced THz radiation

et al. 2021

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In this work, we theoretically study the transduction of orbital angular momentum (OAM) l for infrared pump lasers into the THz domain. In the case of optical rectification, the transduction of OAM occurs only through a spin–orbit interaction, with the selection rule on the OAM l = 0 valid for any kind of polarization of the pump, which means that there is no transfer of OAM along the propagation axis. In difference frequency generation, the selection rule for the difference Δ l between the OAM of the pump fields with linear or circular polarization is l = Δ l , whereas l ranges from Δ l − 2 to Δ l + 2 in cases of both radial and azimuthal polarization. Moreover, for THz generation in the latter case, the high diffraction obtained with tightly focused pumps yields l tending to Δ l ± 2 , while l tends to zero in the opposite case of large pump beams.

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supporting

confidence: 91%

mentioning

confidence: 98%

Selection rules for the orbital angular momentum of optically produced THz radiation

et al. 2021

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“…If we look to the results of other authors obtained in a similar problem, we can see that this scheme is actively studied and successfully tested experimentally. Thus, in [5], the conversion of an OAM signal from the optical to the terahertz spectral region was experimentally studied using a quadratic-nonlinear element. The relations for the output signal parameters, in particular, the OAM topological charge (ℓTHz) and the conversion efficiency η DFG , are also obtained there, see ( 2) and (3).…”

Section: Analysis Of Optical Quadratic-nonlinear Materials and Structures Potentially Suitable For The Design Of A Nonlinear Convertermentioning

confidence: 99%

A Nonlinear Radio-photon Conversion Device

Vinogradova¹,

Gizatulin²,

Meshkov³

et al. 2022

Preprint

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The article analyzes existing materials and structures with quadratic-nonlinear optical properties that can be used to generate a difference frequency in the terahertz and sub-terahertz frequency ranges. The principle of constructing a nonlinear optical-radio converter, based on an optical focon (a focusing cone), is proposed. Based on the assumption that this focon can be implemented from the metal-organic framework (MOF), we propose a technique for modeling its parameters. The mathematical model of the process of propagation and nonlinear interaction of waves inside the focon is based on a simplification of the nonlinear wave equation. Within the framework of the developed model, the following parameters are approximately determined: the 3D gradient of the linear refractive index and the function determining the geometric profile of the focon, which provide a few-mode-based generation of the difference frequency.

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“…Yet, it only can be adopted in a certain frequency. Moreover, THz vortex beams can be indirectly generated by optical vortex-pumped difference frequency generation (DFG) in a nonlinear crystal [22], [23] or vortex-laser-induced air plasma [24], [25].…”

Section: Introductionmentioning

confidence: 99%

Narrowband Terahertz Emission With Tunable Orbital Angular Momentum by Vortex Laser-Beam Interaction

Zhang

Wang

et al. 2022

IEEE Photonics J.

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Terahertz vortex beams need to be developed for supporting new applications in fundamental sciences. In this paper, a novel and feasible scheme is presented for generation of helically microbunched electron beam for the emission of terahertz (THz) vortex pulses. In the scheme, a seed laser pulse with longitudinal and azimuthal modulation is firstly produced by optical beating of dual-vortex pulses. Through the laser-electron interaction, such a complex profile of laser can be converted to a periodically azimuth-dependence energy modulation in the electron beam, which finally forms a helical microbunching structure in the beam after a dispersion section. Then, this electron beam is applied to emit THz vortex beams and its quantum number can be continuously tuned by changing the topological charges of the optical laser pulses. This approach is suited to conventional accelerator system consisted of a modulator and a chicane. We expect this presentation can access to new researches in THz science.

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Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

Cited by 39 publications

References 72 publications

Selection rules for the orbital angular momentum of optically produced THz radiation

Selection rules for the orbital angular momentum of optically produced THz radiation

A Nonlinear Radio-photon Conversion Device

Narrowband Terahertz Emission With Tunable Orbital Angular Momentum by Vortex Laser-Beam Interaction

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