Theoretical study of the generation of terahertz radiation by the interaction of two laser beams with graphite nanoparticles

Javan, N. Sepehri; Erdi, F. Rouhi

doi:10.1063/1.4995510

Cited by 22 publications

(21 citation statements)

References 52 publications

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“…The order of the emitted THz field in our case is the same as in Ref. [52], while it is 10 3 and 10 2 times higher in magnitudes as compared to the one obtained by Sepehri Javan and Rouhi Erdi [39] and Sharma et al [40], respectively. An identical behavior to [39,40,52] for their investigation on size of nanoparticles has also been obtained in our scheme when height-to-radius ratio of the cylinders is evaluated on the THz field.…”

Section: Resultssupporting

confidence: 79%

“…This finally leads to the enhanced efficiency of the scheme. We have compared our results with the experimental findings of Polyushkin et al [35], Welsh et al [36] and Zhang et al [37], and theoretical studies of Kajikawa et al [38], Sepehri Javan and Rouhi Erdi [39], Sharma et al [40], Varshney et al [52], Thakur et al [53] and Sepehri Javan et al [54] who considered Gaussian, super-Gaussian, top head, ring shaped or hollow Gaussian laser beams for their study. In our case, the host medium having cylindrical graphite nanocylinders is irradiated by the hat-top laser beams.…”

Section: Resultsmentioning

confidence: 82%

“…Different structures of nanomaterials such as nanospheres, nanocylinders have been found to affect the amplitude of emitted THz radiation [35][36][37][38]. In addition to these experiments, a theoretical investigation for generating THz radiation with the help of nanoparticles has been performed by Sepehri Javan and Rouhi Erdi [39]. Further, a comparative analytical study has been performed by our group for a medium of spherical and cylindrical nanoparticles irradiated by super-Gaussian laser beams [40].…”

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: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 82%

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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“…Significant enhancement observed in THz field amplitude for ring shape laser field envelope for mixture of SNPs and CNPs. Present numerical results are found to be consistent with the previously reported results by Javan and Erdi (Javan and Erdi, 2017), where laser beat wave interacts with density modulated SNPs under phase matching condition.…”

Section: Resultssupporting

confidence: 91%

Laser Intensity Profile Based Terahertz Field Enhancement from a Mixture of Nano-Particles Embedded in a Gas

Varshney

Singh

Kundu

et al. 2021

Preprint

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Nano-particle embedded system plays an importance in developing of future terahertz (THz) radiation source for real-world applications. The laser interactions with nanoparticle embedded system can produce a wide range of THz radiation due to plasma oscillations excitation. We investigate THz field generation from the laser-beat wave interaction with a mixture of spherical and cylindrical graphite nanoparticles (NPs) in argon gas. Different laser intensity distributions such as Gaussian, cosh-Gaussian, flat-top and ring shape laser pulses have been studied in this work. The relevant plasmon resonance conditions with appropriate symmetry of spherical nanoparticles (SNPs) and cylindrical nanoparticles (CNPs) are discussed. THz field is enhanced upto the order of when the laser intensity redistributes along the polarization direction for a ring shape field envelope.

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“…All the mentioned facts in this paragraph, may emphasize on the importance of considering restoring force in dynamical problems related to the interaction of EMWs with MNPs in the classical regime. In some studies related to the interaction of EMWs with systems including MNPs, in classical momentum equation, the restoring force which can predict the resonance frequency is considered [54][55][56][57][58][59][60][61][62][63][64][65][66][67] but surprisingly it is absent in the dynamics of the most of the studies related to the Drude-based problems and as it is mentioned in the previous paragraph, they considered only the free path limitation on the dynamics of conduction electrons in MNPs. In some studies related to the plasmonics of metallic nanostructures, for extraction of permittivity of system by Drude-based models, in the equation of motion of damped harmonic oscillation, the restoring force is considered and the related spring constant is determined by simulation [68][69][70][71][72][73].…”

Section: Introductionmentioning

confidence: 99%

Modified Drude model for small gold nanoparticles surface plasmon resonance based on the role of classical confinement

Kheirandish

Javan

Mohammadzadeh

2020

Sci Rep

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In this paper, we study the effect of restoration force caused by the limited size of a small metallic nanoparticle (MNP) on its linear response to the electric field of incident light. In a semiclassical phenomenological Drude-like model for small MNP, we consider restoration force caused by the displacement of conduction electrons with respect to the ionic positive background taking into account a free coefficient as a function of diameter of nanoparticle (NP) in the force term obtained by the idealistic Thomson model in order to adjust the classical approach. All important mechanisms of the energy dissipation such as electron-electron, electron-phonon and electron-NP surface scatterings and radiation are included in the model. In addition a correction term added to the damping factor of mentioned mechanisms in order to rectify the deficiencies of theoretical approaches. For determining the free parameters of model, the experimental data of extinction cross section of gold NPs with different sizes doped in the glass host medium are used and a good agreement between experimental data and results of our model is observed. It is shown that by decreasing the diameter of NP, the restoration force becomes larger and classical confinement effect becomes more dominant in the interaction. According to experimental data, the best fitted parameter for the coefficient of restoration force is a third order negative powers function of diameter. The fitted function for the correction damping factor is proportional to the inverse squared wavelength and third order power series of NP diameter. Based on the model parameters, the real and imaginary parts of permittivity for different sizes of gold NPs are presented and it is seen that the imaginary part is more sensitive to the diameter variations. Increase in the NP diameter causes increase in the real part of permittivity (which is negative) and decrease in the imaginary part. :1912.11245v1 [cond-mat.mtrl-sci] arXiv

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Theoretical study of the generation of terahertz radiation by the interaction of two laser beams with graphite nanoparticles

Cited by 22 publications

References 52 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

Laser Intensity Profile Based Terahertz Field Enhancement from a Mixture of Nano-Particles Embedded in a Gas

Modified Drude model for small gold nanoparticles surface plasmon resonance based on the role of classical confinement

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