Generalized treatment of skew-cosh-Gaussian lasers for bifocal terahertz radiation

Malik, Hitendra K.

doi:10.1016/j.physleta.2020.126304

Cited by 28 publications

(17 citation statements)

References 37 publications

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“…In view of different density of electron clouds in the two regions, we have the THz radiation at two different resonance frequencies. By reducing the length of the nanocylinders which is not difficult to manipulate experimentally [15,51], one can convert this bifrequency radiation into unifrequency radiation [14]. This way the tuning can be achieved based on which one can tune the intensities of two types of the THz radiations.…”

Section: Resultsmentioning

confidence: 99%

“…The erratic characteristics of these radiation hastened the scientific community all over the world for generating them. Therefore, a variety of techniques for THz radiation generation such as optical rectification [10], photoconductive emitters [11], synchrotron radiation [12], Cherenkov [13], laser plasma interaction [14][15][16][17][18], semiconductor antennas [19] have been explored. Antenna systems have proved to be quite useful for the generation of such radiation and their various applications [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Hat-Top Beams for Generating Tunable THz Radiations Using a Medium of Conducting Nanocylinders

2021

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There are a large number of studies for terahertz (THz) radiation generation, but tunable THz sources are still a challenge since it is difficult to tune frequency, focus and intensity of the radiation simultaneously. The present work proposes the THz generation by the interaction of two hat-top laser beams with a host medium of argon gas containing graphite nanocylinders, as these beams result in highly nonlinear interaction because of a smooth dip in their peak intensity and a fast rise and fall in the overall intensity pattern. Such an interaction produces nonlinear current (6.7 × 108 A/m2) because of the electron cloud of the nanocylinders, which can be modulated by the laser and medium properties for realizing tunable THz radiation. The orientation of basal planes of nanocylinders is shown to be important for this mechanism, though it may be challenging for the experimentalists. The resonant excitation takes place when the plasmon frequency matches the beating frequency of the laser beams, and in the proposed mechanism one can have longitudinal surface plasmon resonance (~12 THz) and transverse surface plasmon resonance (~40 THz), leading to frequency-tunable THz radiation. The role of height and inter particle distance between the adjacent nanocylinders on the THz field amplitude and the efficiency of the mechanism is uncovered by controlling the aspect ratio in the nanocylinders. For example, reducing the inter particle distance from 180 nm to 60 nm leads to the enhancement of THz field from 1 × 108 V/m to 5.48 × 108 V/m. The profile of the emitted THz radiation is investigated in detail under the effect of various parameters in order to prove the practicality of the proposal. The proposed design and mechanism would be attractive for electromagnetic and communication societies which are dealing with millimeter-waves and THz components in addition to its medical application.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hat-Top Beams for Generating Tunable THz Radiations Using a Medium of Conducting Nanocylinders

2021

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“…Also a comparison of Figures 1(a) and (b) yields that the effect of magnetic field is to enhance the amplitude of the wakefield, similar to the case of skew-coshyperbolic Gaussian lasers used for excitation of wakefield and its conversion to THz radiation [36]. Skew-coshyperbolic lasers have also been found to produce bifocal THz radiation where its conversion to unfocal THz was possible [37] in different mechanism. The laser's different shapes have been found to contribute significantly in another field also [43,44].…”

Section: Results On Wakefieldmentioning

confidence: 56%

“…The researchers all over the world are putting their efforts to generate the THz radiation sources where the laser plasma interaction has vital role to play. There are a lot of studies on laser plasma interaction, which talk about different mechanisms [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. Extremely powerful THz radiations have been achieved by interaction of chirped [24], few cycle laser pulses [25] and tailored laser pulses [26] with plasmas.…”

Section: Introductionmentioning

confidence: 99%

Strong Terahertz radiation generation via wakefield in collisional plasma

Malik

Singh

Kumar³

2020

Journal of Taibah University for Science

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The present calculations show that the application of an external magnetic field can generate additional component of the wakefield suitable for Terahertz (THz) radiation generation in a collisional plasma. Based on the approach of perturbation technique under quasi-static approximation, a study is made on the field of emitted radiation pulses from the wakefield when the super-Gaussian laser beams are used. The field of the radiation becomes stronger when stronger magnetic field is applied and the same is the case for the lasers of higher index.

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“…Such lasers have been found to create electron vortices [18] and create plasma channels [19] in addition to their self-focusing and frequency shifting [20]. The point of greater flexibility in frequency difference in the present proposal can be exploited for the application in radiation generation [21]. .…”

Section: Comparison and Confirmation By Mathematical Calculationsmentioning

confidence: 98%

Uncovering the remarkable contribution of lasers peak intensity region in holography

et al. 2021

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For the scheme of two colour lasers in interference and holography, we uncover remarkable contribution of focusing region (spread) of the peak intensity of superposing laser beams based on the numerical studies and confirm it by mathematical calculations. The pulses having peak intensity for a wider region create better interference pattern, leading to higher modulation depth. Also, such beams having a stronger intensity gradient enhance the range of frequency detuning (difference), which would ease the experimentation in getting better holograms. A comparison of the results achieved with such beams is done with the most commonly used Gaussian beams for the better understanding of the concept for the advancement in holography.

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Generalized treatment of skew-cosh-Gaussian lasers for bifocal terahertz radiation

Cited by 28 publications

References 37 publications

Hat-Top Beams for Generating Tunable THz Radiations Using a Medium of Conducting Nanocylinders

Hat-Top Beams for Generating Tunable THz Radiations Using a Medium of Conducting Nanocylinders

Strong Terahertz radiation generation via wakefield in collisional plasma

Uncovering the remarkable contribution of lasers peak intensity region in holography

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