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THz generation by nonlinear mixing of obliquely incident laser beams in the closely-packed assemblage of anharmonic upright CNTs

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Abstract

A theoretical scheme of terahertz (THz) generation by the nonlinear mixing of obliquely incident laser beams in the closely-packed assemblage of anharmonic upright carbon nanotubes (CNTs) is examined. In the scheme, anharmonicity is explained on the basis of the nonlinear variation of restoration force on the electrons of upright CNTs and it is observed to play a pivotal role in the enhancement of THz generation. The laser beams incident obliquely at some angle \({\prime}{\theta {\prime}}\) on the closely-packed assemblage of upright CNTs forested over the non-conductive sapphire or silicon on sapphire (SOS) substrate so that each upright CNT of the assemblage exhibits the oscillatory behavior. The proposed scheme is quite suitable for generating efficient THz radiations at optimized values of the laser beams, plasma, and CNTs parameters. The absorption of obliquely incident laser beams by the closely-packed assemblage of upright CNTs is observed to attain its peak at the specific angle of incidence known as the critical angle and in the present scheme it is \(\uptheta ={44.3}^{{{o}}}\). We also explore the impact of interior radius, exterior radius, critical angle, and length of CNTs and some other related parameters with energy efficiency on the THz generation.

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Authors and Affiliations

  1. Department of Physics, Lovely Professional University, G.T. Road, Phagwara, Punjab, 144411, India

    Vishal Thakur & Sandeep Kumar

  2. Department of Physics, Alexandra School, Queen’s Road, Amritsar, Punjab, 143001, India

    Sandeep Kumar

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  1. Vishal Thakur
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Thakur, V., Kumar, S. THz generation by nonlinear mixing of obliquely incident laser beams in the closely-packed assemblage of anharmonic upright CNTs. J Opt (2023). https://doi.org/10.1007/s12596-023-01558-3

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