Effective factors on twisted terahertz radiation generation in a rippled plasma

Abstract

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.

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

“…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.…”

Generation of terahertz radiation by a Hermite–Gaussian laser beam inside magnetoplasma with a density ramp

“…Laser–plasma interaction has led to many developments in terahertz generation (Sobhani, Dadar & Feili 2017; Sun, Wang & Zhang 2022), second-harmonic generation (Upadhyay & Tripathi 2005; Sharma, Thakur & Kant 2020), plasma-wakefield excitation for particle acceleration (Kim et al 2021; Kad & Singh 2022 b ), etc. Plasma being a nonlinear medium has an extraordinarily high damage threshold, and is thus capable of sustaining a high-intensity electric field (Hassan et al 2012).…”

The influence of static magnetic field on nonlinear response of a plasma background in the presence of two laser beams with different profiles (Hermite– and Laguerre–Gaussian)

“…These anisotropic phenomena can influence and also tune the electric field profile of EM waves propagating in an optically active medium. Nowadays, a large number of studies have been devoted to the harmonic generation in optically active media by nonlinear interaction of laser beams of different profiles [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Theoretical and experimental evidence indicates that the spatial profile of the laser beam plays a pivotal role in the electric field amplitude of generated radiation [16][17][18][19][20][21][22][23][24][25][26][27].…”