THz wave emission from argon in two-color laser field

Du, Lin; Zhao, Song-Feng; Zhou, Xiaoxin; Zhao, Zengxiu

doi:10.1088/1674-1056/24/4/043203

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…QCM, which only requires a small amount of absorbent, offers short response times and allows for detection of mass changes. The terahertz (THz) wave bridges the gap between microwave and infrared, [14][15][16][17][18] which can evaluate adsorption process regarding intermolecular and intramolecular modes because the THz spectrum is sensitive to fluctuations in the dipole moment of organic compounds. [19][20][21][22][23] In this study, the adsorption process of four substances and two binary mixtures is studied by terahertz time domain spectroscopy (THz-TDS).…”

Section: Introductionmentioning

confidence: 99%

Competitive and synergistic adsorption of binary volatile organic compound mixtures on activated carbon

et al. 2019

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The adsorption of four substances and their binary mixture is investigated via the terahertz time domain spectroscopy (THz-TDS). The selected unary compound (ethanol, acetone, ethyl acetate, and n-propyl acetate) and binary mixture (solution 1 is composed of ethanol and acetone, and solution 2 is composed of ethyl acetate and n-propyl acetate) exhibit different adsorption behaviors with varied polarities. In comparison with single component, solution 1 shows shorter adsorption equilibrium time, faster adsorption rate, and stronger adsorption capacity, which conform to a synergistic adsorption mechanism, while the competitive behavior is attributed to the slower adsorption in solution 2. In addition, the pseudo-second-order equation with terahertz parameter is used to assess the rate of binary component organics. The present results indicate a further understanding of multicomponent adsorption mechanisms.

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Section: Introductionmentioning

confidence: 99%

Competitive and synergistic adsorption of binary volatile organic compound mixtures on activated carbon

et al. 2019

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“…Another well-known method is based on the two-color laser mixing scheme. [8][9][10][11][12] An intense femtosecond pulse together with its second harmonic pulse are focused into a gas medium to ionize the atoms and molecules nonsymmetrically. Then the laser-induced plasma generates a transient current and produces intense broadband THz emissions.…”

mentioning

confidence: 99%

“…Then the laser-induced plasma generates a transient current and produces intense broadband THz emissions. [13] This photocurrent model was proposed by Kim et al [10][11][12]14] However, this conversion process requires high-intensity pulses (greater than 10 14 W/cm 2 ), which are not directly attainable using a femtosecond oscillator. It also requires a precise control of the phase difference between the fundamental field and its second harmonic.…”

mentioning

confidence: 99%

Enhanced THz Radiation from Spatially Inhomogeneous Fields

Jia 贾,

Zhao 赵,

Zhang 张

et al. 2023

Chinese Phys. Lett.

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Nonlinear terahertz (THz) radiation from gas media usually relies on the asymmetric laser-induced current produced by ultra-intense two-color laser fields with a specific phase delay. Here a new scheme is proposed and theoretically investigated, in which the radiation is generated by spatially inhomogeneous fields induced by relatively low-intensity monochromatic lasers and an array of single triangular metallic nanostructures. Our simulations are based on the classical photocurrent model and the time-dependent Schrödinger equations, respectively. It is found that the collective motion of the ionized electrons can be efficiently controlled by the inhomogeneous field, resulting in strong residual currents. The intensity of the THz radiation could be enhanced by about two orders of magnitude by increasing the spatial inhomogeneity of the field.

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Nonlinear THz radiation investigated by quantum simulations

Liu¹,

Xu²,

Jia³

et al. 2020

Opt. Express

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Terahertz (THz) waves can be generated by the nonlinear interaction between ultrashort laser pulses and air. The semiclassical photocurrent model is widely used. It is simple, but neglects the quantum effects. Some theoretical works are based on solving the time-dependent Schrödinger equation. However, it meets the difficulty of prohibitively large boxes in long-time evolution. Here we adopted the wave-function splitting algorithm to fully contain the information of photoelectrons. The contributions of the excited states and interference effects in electron wavepackets to THz radiation are studied numerically. We also theoretically investigated the THz generation from nitrogen molecules in a biased electric field. It is found that the THz yield enhancement as a function of the static field strength in experiments can be reproduced well by our method. In addition, the restriction of wavelength and phase difference in the two-color laser fields is less strict in the presence of the static field.

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THz wave emission from argon in two-color laser field

Cited by 3 publications

References 34 publications

Competitive and synergistic adsorption of binary volatile organic compound mixtures on activated carbon

Competitive and synergistic adsorption of binary volatile organic compound mixtures on activated carbon

Enhanced THz Radiation from Spatially Inhomogeneous Fields

Nonlinear THz radiation investigated by quantum simulations

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