Terahertz twisted beams generation in plasma

Sobhani, Hassan; Vaziri, Manouchehr; Rooholamininejad, Hosein; Bahrampour, Abbas

doi:10.1140/epjd/e2016-70035-7

Cited by 20 publications

(27 citation statements)

References 45 publications

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“…Therefore intensity variation of LG lasers in the transverse direction is strong, and the plasma current or laser ponderomotive force can generate a THz wave at the beating frequency (Sobhani et al. 2016 b ).…”

Section: Resultsmentioning

confidence: 99%

“…Under the competition between the ponderomotive force effect and beam diffraction, periodic self-focusing and defocusing occurs and a density-modulated filament is created. Therefore intensity variation of LG lasers in the transverse direction is strong, and the plasma current or laser ponderomotive force can generate a THz wave at the beating frequency (Sobhani et al 2016b).…”

Section: Resultsmentioning

confidence: 99%

“…Using the separation of variables method, a homogeneous solution of (2.8) in the absence of the nonlinear current density, is given as (Sobhani et al. 2016 b ) where the amplitude of the wave, is a constant. It is expected on physical grounds that, when the nonlinear source term is not too large, the solution to (2.8) will still be of the form of (2.9), except that will be a slowly varying function of .…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Twisted THz radiation generated by beating Laguerre–Gaussian (LG) lasers has been proposed in which the evolution of the beams width in plasma is considered (Sobhani, Rooholamininejad & Bahrampour 2016 b ). In this research, the effective factors such as plasma density, Gouy phase and orbital angular momentums of the input lasers on the output twisted terahertz radiation are investigated.…”

Section: Introductionmentioning

confidence: 99%

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Effective factors on twisted terahertz radiation generation in a rippled plasma

2017

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Based on the beating of two Laguerre–Gaussian laser beams in a rippled plasma medium, the effective factors such as plasma density, Gouy phase and orbital angular momentums of input lasers on the output twisted terahertz radiation are investigated. As a result, the amplitude of the generated vortex terahertz radiation is an increasing function of plasma density. The vortex terahertz intensity is strongly dependent on the orbital angular momentum of the input lasers. The terahertz output amplitude increases by decreasing the orbital angular momentum of the Laguerre–Gaussian input lasers. Here, by employing a suitably ripple wavenumber, the destroyer effect of the relative Gouy phase of the input lasers is removed, and perfect phase matching is satisfied.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effective factors on twisted terahertz radiation generation in a rippled plasma

2017

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“…For biosensor applications, the use of the proposed CRR sensor may allow the detection of small biomolecules. Furthermore, owing to non-ionizing characteristics and high penetrating power of terahertz (THz) waves, the THz generation is of great interest (Sobhani et al , 2016b; Sobhani et al , 2016a; Sobhani et al , 2016c; Sobhani, 2017a; Sobhani et al , 2016d; Sobhani et al , 2017a; Sobhani et al , 2017b; Sobhani et al , 2017c; Sobhani, 2017b; Sobhani, 2017c; Sobhani et al , 2018a; Sobhani et al , 2018b; Sobhani and Zohrabi, 2018). We are currently investigating the designing of a high-sensitivity sensor in the THz domain which is based on reflection-type MRRs.…”

Section: Discussionmentioning

confidence: 99%

Design and analysis of all optical biochemical sensors based on the coupled-ring reflectors

Feili

Sabouhi

Sobhani

et al. 2019

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Purpose This study aims to propose a new scheme for designing a high-sensitivity optical biosensor. For this, two agents have been considered: reflection-type micro-resonators, which filter the noise of the pump, and coupled-ring reflectors (CRRs), which are coupled to partial reflecting elements in the bus waveguide to create Fano-resonance. These two agents improve the sensor sensitivity and have low-power optical switching/modulation. Design/methodology/approach The proposed model is based on the coupling of the CRRs with the Fabry–Pérot cavity. The slope of the Fano-resonance line shape and consequently the sensitivity of the proposed CRRs are higher than those of conventional microring resonators. Findings The proposed scheme has many characteristics: CRRs have been used to create a higher slope of the Fano-resonance line shape; the sensitivity of the sensor shows improvement on the basis of reflection-type micro-resonators and by the removal of the pump noise; the designed sensor has low-power optical switching/modulation; and the modeling and designing of a novel high-sensitivity resonator is based on coupling the CRRs with the Fabry–Pérot cavity. Originality/value This study has proposed a new scheme for designing a high-sensitivity optical biosensor. This method is based on the improvement of the sensitivity by two agents: reflection-type micro-resonators, which filter the noise of the pump, and coupled-ring reflectors, which are coupled to partial reflecting elements in the bus waveguide to create Fano-resonance.

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