Resonant Enhancement of THz Radiation Through Vertically Aligned Carbon Nanotubes Array by Applying Wiggler Magnetic Field

Vij, Shivani; Kant, Niti; Thakur, Vishal

doi:10.1007/s11468-018-0892-2

Cited by 31 publications

(15 citation statements)

References 12 publications

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“…The physical process behind this observation is that, with the increase in the anharmonicity parameters of the medium the large absorption of laser beam by the electrons takes place resulting the significant heightening of the curve of second harmonic amplitude. Such enhancement of amplitude of generated radiation with increased radius of CNTs in the nonlinear interaction of laser with CNTs has been reported analytically by Vij et al [18] and Kumar & Kumar [19]. One more very important finding from this figure is that, as the value of the R/a is raised, the surface plasmon resonance occurs at the higher value of normalized frequency.…”

Section: Resultssupporting

confidence: 79%

Resonant Second Harmonic Generation in an Array of Magnetized Anharmonic Carbon Nanotubes

Vij

Kumar

Thakur

et al. 2022

Preprint

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An analytical model of second harmonic generation (SHG) from amplitude modulated laser irradiated carbon nanotubes (CNTs) implanted in silica substrate is presented. In the interaction of an intense amplitude modulated laser with an array of magnetized anharmonic CNTs, a force is exerted on the electrons of CNTs due to the electric field of the laser. The exerted force causes the displacement of the electrons which is of the order of the radius of CNTs due to their nanoscale dimensions. In turn, the restoring force of the electrons becomes a nonlinear function of the displacement and results in anharmonicity. The CNTs are magnetized by applying the magnetic field perpendicularly to the beam propagation direction. The anharmonicity in CNTs broadens the plasmon resonance. The effects of the amplitude modulated parameter and CNTs parameters on the amplitude of the second harmonic are analyzed. The magnetic field also helps to enhance the power of generated second harmonic.

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Section: Resultssupporting

confidence: 79%

Resonant Second Harmonic Generation in an Array of Magnetized Anharmonic Carbon Nanotubes

Vij

Kumar

Thakur

et al. 2022

Preprint

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“…This increase in the number density of CNTs results in the increase of the nonlinearities of the array of VA-CNTs. Vij et al [7] has shown the similar results in their theoretical study of THz generation by using CNTs under the effect of a wiggler magnetic field. Also, the surface plasmon resonance condition ω = ω p [(1 + β) 2ϵ r ⁄ + ω α 2 ] 1 2 ⁄ is independent of the inter-tube separation distance d, therefore in this graph surface plasmon resonance point remains same for the three curves.…”

Section: The Length Of Eachsupporting

confidence: 53%

“…In the present century, researchers have provided variety of schemes for the efficient generation of THz radiations. In these schemes, THz radiations are generated using various methods, for example by employing laser coupling to anharmonic CNTs [6], by using a wiggler magnetic field on vertically aligned carbon nanotubes (VA-CNTs) [7], buy using anharmonic CNTs in the presence of static magnetic field [8], by using laser filaments in the presence of static electric and magnetic fields [9], etc. According to Batrakov et al [10], THz radiations can be generated through CNTs by using a static electric field.…”

Section: Introductionmentioning

confidence: 99%

Efficient THz Generation by Nonlinear Interaction of Gaussian Laser Beam With the Anharmonic and Rippled CNTs Aligned Vertically in the Array

Kumar

Vij

Kant

et al. 2021

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We purpose a theoretical analysis for the generation of efficient terahertz (THz) radiation by using the nonlinear interaction of Gaussian laser beam with vertically aligned anharmonic, and rippled carbon nanotubes (CNTs) array. This array of vertically aligned carbon nanotubes (VA-CNTs) is embedded on the base of the dielectric surface. The VA-CNTs have been magnetized by applying a static magnetic field mutually perpendicular to the direction of propagation of the Gaussian beam and length of CNTs. The Gaussian laser beam passing through the CNTs exerts a nonlinear ponderomotive force on the electrons of CNTs and provides them resonant nonlinear transverse velocity. This produces the nonlinear current which is further responsible for the generation of THz radiation. The anharmonicity plays a vital role in the efficient generation of THz radiation. The anharmonicity arises due to the nonlinear variation of restoration force on the various electrons of CNTs. This anharmonicity in the electrons of CNTs helps in broadening the resonance peak. We have observed that externally applied static magnetic field 110 kg to 330 kg) also paves the way for the enhancement of the normalized THz amplitude.

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“…Hence, the alternative to avoid this issue is to employ a nonlinear medium, which can endure highpeak ultrashort laser power. In this context, several schemes and models have been proposed and realized [7][8][9][10][11]. Plasma emerges as a potential alternative medium for the same technique and can withstand high power due to ultrashort laser pulses.…”

Section: Introductionmentioning

confidence: 99%

Effect of frequency-chirped laser pulses on terahertz radiation generation in magnetized plasma

2019

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The effect of frequency chirp on the generated terahertz (THz) wave by the interaction between intense laser pulses and under dense plasma in the presence of transverse magnetic field is investigated theoretically in the present model. An expression for the electron Lorentz factor coupling cyclotron motion nonlinearity is derived for static magnetic field perpendicular to the laser propagation axis. The beating lasers produce a nonlinear ponderomotive force due to their oscillatory motion. This force drives a nonlinear current, at beat frequency, which produces the THz radiation. The influence of the external magnetic field on the optimization process of THz field amplitude is investigated numerically. A linear frequency chirp increases the duration of nonlinear interaction of laser pulse with plasma electrons and hence, enforces the interaction for longer duration. The presence of magnetic field further provides the additional momentum to the THz photon to obtain a significant gain in output yield. Our numerical simulations reveal that there is a significant enhancement in the THz field strength for optimized value of the chirp parameter and magnetic field.

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Resonant Enhancement of THz Radiation Through Vertically Aligned Carbon Nanotubes Array by Applying Wiggler Magnetic Field

Cited by 31 publications

References 12 publications

Resonant Second Harmonic Generation in an Array of Magnetized Anharmonic Carbon Nanotubes

Resonant Second Harmonic Generation in an Array of Magnetized Anharmonic Carbon Nanotubes

Efficient THz Generation by Nonlinear Interaction of Gaussian Laser Beam With the Anharmonic and Rippled CNTs Aligned Vertically in the Array

Effect of frequency-chirped laser pulses on terahertz radiation generation in magnetized plasma

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