Effect of magnetic field on terahertz generation via laser interaction with a carbon nanotube array

Jain, Santosh; Parashar, J.; Kurchania, Rajnish

doi:10.1186/2228-5326-3-1

Cited by 215 publications

(6 citation statements)

References 23 publications

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“…The reason behind this observation is that, the applied magnetic field exerts force on the electrons of the medium and hence makes the interaction/system more nonlinear. The same observation was reported by Jain et al [20] where they have used a magnetized array of CNTs embedded on the metal surface to study radiation generation.…”

Section: Resultssupporting

confidence: 70%

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: 70%

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

Vij

Kumar

Thakur

et al. 2022

Preprint

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“…and hence, the THz wave of maximum amplitude is by the system. Similar results were shown by Kumar et al [7] and Jain et al [21] where they applied the magnetic field on an array of CNTs embedded on the dielectric and metal surface respectively. It is also observed that at B = 75 kG, THz amplitude increases by 16% as compared to the THz amplitude in the absence of a magnetic field and attains peak value at the optimized value of the static magnetic field at B = 125 kG This is because the increase in the value of the static magnetic field increases the cyclotron frequency of the electrons of CNTs and hence, the nonlinear current density.…”

Section: Numerical and Graphical Analysissupporting

confidence: 83%

Interaction of spatial-Gaussian lasers with the magnetized CNTs in the presence of DC electric field and enhanced THz emission

et al. 2022

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The interaction of spatial-Gaussian lasers (〖~10〗^13 Wcm^(-2) ) with magnetized carbon nanotubes (CNTs) in the presence of a D.C. electric field is shown to broaden the surface plasmon resonance effectively. The prime feature of the interaction of lasers with magnetized CNTs is that when the electron cylinder of CNT is shifted with respect to the ion cylinder, the space charge electric field is developed in the overlapped region and results in the restoration force of the electrons. The restoration force along with the ponderomotive and magnetic forces assist to increase the nonlinear current which is further enhanced by the drift velocity acquired by the electrons of CNTs due to the applied static electric field. This action is also responsible for the enhanced THz yield at surface plasmon resonance condition ω=ω_P √(ρ⁄(2ϵ_g )+((ω_c^2)⁄(ω_P^2 ))), where ρ is the polarization coefficient, ϵ_g is the relative permittivity of the dielectric substrate, ω_c is the cyclotron frequency of CNT electrons and ω_p is the plasma frequency. The study reveals that THz generation from the magnetized CNTs may be a promising source for the detection of dangerous chemicals like royal demolition explosive (RDX), pentaerythritol tetra-nitrate (PETN), trinitrotoluene (TNT), etc.

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“…The band at 1090 cm −1 was attributed to the asymmetric stretching vibrations mode of phosphate groups [38], while the bands at 604 and 565 cm −1 were assigned to the bending vibration mode of phosphate groups [39,40]. The bands at 1038 and 451 cm −1 were assigned to the asymmetric and bending Si-O-Si stretching vibration of silicate groups, respectively [41,42]. The presence of Si-O-Si bending vibration which was attributed to normal vibration modes of Si-O in the SiO 4 group, indicated the presence of amorphous silicate [43].…”

Section: Resultsmentioning

confidence: 99%

Liquid Phase Sintered Ceramic Bone Scaffolds by Combined Laser and Furnace

Feng

Deng

Duan

et al. 2014

IJMS

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Fabrication of mechanically competent bioactive scaffolds is a great challenge in bone tissue engineering. In this paper, β-tricalcium phosphate (β-TCP) scaffolds were successfully fabricated by selective laser sintering combined with furnace sintering. Bioglass 45S5 was introduced in the process as liquid phase in order to improve the mechanical and biological properties. The results showed that sintering of β-TCP with the bioglass revealed some features of liquid phase sintering. The optimum amount of 45S5 was 5 wt %. At this point, the scaffolds were densified without defects. The fracture toughness, compressive strength and stiffness were 1.67 MPam1/2, 21.32 MPa and 264.32 MPa, respectively. Bone like apatite layer was formed and the stimulation for apatite formation was increased with increase in 45S5 content after soaking in simulated body fluid, which indicated that 45S5 could improve the bioactivity. Furthermore, MG-63 cells adhered and spread well, and proliferated with increase in the culture time.

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Effect of magnetic field on terahertz generation via laser interaction with a carbon nanotube array

Cited by 215 publications

References 23 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

Interaction of spatial-Gaussian lasers with the magnetized CNTs in the presence of DC electric field and enhanced THz emission

Liquid Phase Sintered Ceramic Bone Scaffolds by Combined Laser and Furnace

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