Single Free-Falling Droplet of Liquid Metal as a Source of Directional Terahertz Radiation

Solyankin, P. M.; Lakatosh, B. V.; Krivokorytov, M. S.; Tsygvintsev, I. P.; Sinko, Anton S.; Kotelnikov, I. A.; Makarov, Vladimir; Coutaz, Jean‐Louis; Medvedev, V. V.; Shkurinov, Alexander P.

doi:10.1103/physrevapplied.14.034033

Cited by 17 publications

(7 citation statements)

References 45 publications

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“…In recent years, great efforts have been made on new states of matter (beyond gas and solid) being photo-ionized for THz wave generation, such as liquid THz sources. Water films [17,[29][30][31][32][33][34][35][36][37] in both flowing and static forms were studied, as well as the liquid nitrogen [38,39] or even the liquid metal [40,41]. The generated THz energy was proved to be >10 times larger than that achieved from the most standard table-top technique, i.e., the two-color filament in air [37].…”

Section: A Filament Excited In the Water Filmmentioning

confidence: 99%

Traveling-wave antenna model for terahertz radiation from laser-plasma interactions

et al. 2022

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Generation of terahertz (THz) wave from air plasma induced by femtosecond laser pulses with a single central frequency (the so-called "single-color") is one of the fundamental interactions between light and matter, and is also the basis of subsequent pumping schemes using two- or multi-color laser fields. Recently, more states of media beyond gas (e.g., atomic cluster and liquid) via photo-ionization have brought new experimental observations of THz radiation, which can no longer be simply attributed to the mainstream model of the transition-Cherenkov radiation (TCR), thus making the whole picture unclear. Here, we revisited the mechanism of this dynamic process in a new view of the traveling-wave antenna (TWA) model. By successfully reproducing the reported far-field THz radiation profiles from various plasma filament arrangements, the wide applicability of the TWA theory has been revealed. On the other hand in the microscopic view, we investigated the plasma oscillation during filamentation aiming at further bridging the plasma filament and the antenna. Accordingly, THz-plasma resonance has been theoretically and experimentally demonstrated as the elementary THz emitter, paving the way towards fully understanding this important single-color plasma based THz source.

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Section: A Filament Excited In the Water Filmmentioning

confidence: 99%

Traveling-wave antenna model for terahertz radiation from laser-plasma interactions

et al. 2022

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“…Doublepump excitation is also studied in THz wave generation [16,[76][77][78][79]. Recently, THz generation enhancement by several orders of magnitude in power is observed from gallium droplets under double pump excitation [80]. Figure 13(a) shows a schematic of double-pump excitation on a liquid line for THz wave generation in top view.…”

Section: Thz Wave Enhancement Under Double-pump Optical Excitationmentioning

confidence: 99%

Broadband THz Sources from Gases to Liquids

et al. 2021

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Matters are generally classified within four states: solid, liquid, gas, and plasma. Three of the four states of matter (solid, gas, and plasma) have been used for THz wave generation with short laser pulse excitation for decades, including the recent vigorous development of THz photonics in gases (air plasma). However, the demonstration of THz generation from liquids was conspicuously absent. It is well known that water, the most common liquid, is a strong absorber in the far infrared range. Therefore, liquid water has historically been sworn off as a source for THz radiation. Recently, broadband THz wave generation from a flowing liquid target has been experimentally demonstrated through laser-induced microplasma. The liquid target as the THz source presents unique properties. Specifically, liquids have the comparable material density to that of solids, meaning that laser pulses over a certain area will interact with three orders more molecules than an equivalent cross-section of gases. In contrast with solid targets, the fluidity of liquid allows every laser pulse to interact with a fresh area on the target, meaning that material damage or degradation is not an issue with the high-repetition rate intense laser pulses. These make liquids very promising candidates for the investigation of high-energy-density plasma, as well as the possibility of being the next generation of THz sources.

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“…The eutectic alloy of tin and indium (48% Sn and 52% In) has been proposed to generate terahertz waves as well [ 29 ]. In the cited experiment, the metal was in the liquid state due to a preheating process at 140 °C.…”

Section: Introductionmentioning

confidence: 99%

“…By adjusting the delay between them, the intensity of terahertz radiation increased by more than three orders of magnitude. Terahertz radiation from this alloy is explained by the result of the longitudinal distribution of electron density under the action of the ponderomotive force caused by the second laser pulse [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Terahertz Emission by Silver Nanoparticles in a Liquid Medium

et al. 2023

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Due to higher molecular density, lower ionization potential, and a better self-healing property compared with gases, liquid targets have been used for laser-induced terahertz generation for many years. In this work, a liquid target used for terahertz radiation is embedded with silver nanoparticles (Ag NPs), which makes the material have both the fluidity of liquids and conductivity of metals. Meanwhile, the experimental setup is easier to implement than that of liquid metals. Polyvinyl alcohol (PVA) is used as a stabilizing agent to avoid precipitation formation. It is observed that the power of 0.5 THz radiation from the Ag NP suspension is five times stronger than that from liquid water in identical experimental conditions. In addition, the reusability of the material is investigated using multiple excitations. UV–visible spectroscopy and TEM imaging are carried out to analyze the target material after each excitation. As a result, quasispherical Ag NP suspensions show good reusability for several excitations and only a decrease in particle concentration is observed. By contrast, the chain-like Ag NP suspension shows poor stability due to PVA damage caused by intense laser pulses, so it cannot be used in a recyclable manner.

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Single Free-Falling Droplet of Liquid Metal as a Source of Directional Terahertz Radiation

Cited by 17 publications

References 45 publications

Traveling-wave antenna model for terahertz radiation from laser-plasma interactions

Traveling-wave antenna model for terahertz radiation from laser-plasma interactions

Broadband THz Sources from Gases to Liquids

Enhancement of Terahertz Emission by Silver Nanoparticles in a Liquid Medium

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