Abstract
In the present study, a schematic has been proposed for generating terahertz (THz) radiation by beating of two dark hollow (DH) laser beams in plasma when a DC electric field is applied with a perpendicular direction. The small field amplitude and the radiation’s efficiency produced by DH laser beams in plasma as well as DC electric generation and exertion comfortability motivated us to enhance these parameters by applying a perpendicular DC electric field. It was found that applying a DC electric field in addition to increasing the THz field amplitude and efficiency caused the generation of a special THz field, which has an exclusive pattern tunable by the variation of the electric field amplitude. It is shown that due to mutual effects between the spatial profile of the beams and the electric field, the THz radiation field and efficiency have the maximum point that can be used for the production of a desired THz frequency.
Highlights
The remarkable properties of terahertz radiation (THz) sources along with their wide range of applications in the fields of astronomy, spectroscopy, medical imaging, manufacturing, characterization, and communication attract scientists in a lot of research areas.1–7 In comparison to x rays, THz sources are non-ionizing radiations that can be applied for tissue imaging since they are biologically harmless
It was found that applying a DC electric field in addition to increasing the THz field amplitude and efficiency caused the generation of a special THz field, which has an exclusive pattern tunable by the variation of the electric field amplitude
The influence of the dark-size adjusting parameter, DC electric field, and laser beam order on the quality of THz radiation was found through derived equations of the THz radiation field and efficiency along Maxwell’s equations
Summary
The remarkable properties of terahertz radiation (THz) sources along with their wide range of applications in the fields of astronomy, spectroscopy, medical imaging, manufacturing, characterization, and communication attract scientists in a lot of research areas. In comparison to x rays, THz sources are non-ionizing radiations that can be applied for tissue imaging since they are biologically harmless. Since high power THz radiation with low cost is limited, finding a promising technology for manipulating and generating reasonable size and price of its source with high efficiency and power was a great need.9–16 For this purpose, several techniques with both solid-state and optical bases, such as semiconductors, electro-optical crystals, and quantum cascade lasers, were introduced.. Portnoi et al. applied carbon nanotubes to study the influence of magnetic fields on THz radiation via laser interactions Following these approaches, Jain et al., Geng et al., and Welsh and Wynne represented carbon nanotubes, picosecond laser pulses, and metallic nanostructures to obtain reasonable efficiency, respectively. We propose a scheme for THz radiation generation based on beating of two DH laser beams in a plasma having a DC electric field, in which the frequency difference of laser beams lies in the THz range.
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