Observation of broadband terahertz wave generation from liquid water

Jin, Qi; Williams, Kaia; Yiwen, E; Dai, Jianming; Zhang, X.-C.

doi:10.1109/irmmw-thz.2017.8067095

Cited by 7 publications

(7 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Currently, the most powerful table-top THz sources are based on either optical rectification in electro-optic crystals [17][18][19] or twocolor filamentation in gases and liquids [20][21][22][23][24] . With optical rectification THz pulses with energy up to 0.9 mJ 18 and THz conversion efficiency (ratio of generated THz energy to the input laser pulse energy) up to 3.7% 25 were generated.…”

mentioning

confidence: 99%

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

et al. 2020

View full text Add to dashboard Cite

Extreme nonlinear interactions of THz electromagnetic fields with matter are the next frontier in nonlinear optics. However, reaching this frontier in free space is limited by the existing lack of appropriate powerful THz sources. Here, we experimentally demonstrate that two-color filamentation of femtosecond mid-infrared laser pulses at 3.9 μm allows one to generate ultrashort sub-cycle THz pulses with sub-milijoule energy and THz conversion efficiency of 2.36%, resulting in THz field amplitudes above 100 MV cm −1. Our numerical simulations predict that the observed THz yield can be significantly upscaled by further optimizing the experimental setup. Finally, in order to demonstrate the strength of our THz source, we show that the generated THz pulses are powerful enough to induce nonlinear cross-phase modulation in electro-optic crystals. Our work paves the way toward free space extreme nonlinear THz optics using affordable table-top laser systems.

show abstract

mentioning

confidence: 99%

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Our stable free-flowing water film can effectively eliminate the heat accumulation between two adjacent THz pump pulses, and the contribution of heating effects to the TKE signal in the experiment is negligible (see section SVI in the Supplementary Information for details). An optical second-harmonic intensity autocorrelator is used to measure and calibrate the thickness 50 .…”

Section: Methodsmentioning

confidence: 99%

Ultrafast hydrogen bond dynamics of liquid water revealed by terahertz-induced transient birefringence

et al. 2020

View full text Add to dashboard Cite

The fundamental properties of water molecules, such as their molecular polarizability, have not yet been clarified. The hydrogen bond network is generally considered to play an important role in the thermodynamic properties of water. The terahertz (THz) Kerr effect technique, as a novel tool, is expected to be useful in exploring the low-frequency molecular dynamics of liquid water. Here, we use an intense and ultrabroadband THz pulse (peak electric field strength of 14.9 MV/cm, centre frequency of 3.9 THz, and bandwidth of 1-10 THz) to resonantly excite intermolecular modes of liquid water. Bipolar THz field-induced transient birefringence signals are observed in a free-flowing water film. We propose a hydrogen bond harmonic oscillator model associated with the dielectric susceptibility and combine it with the Lorentz dynamic equation to investigate the intermolecular structure and dynamics of liquid water. We mainly decompose the bipolar signals into a positive signal caused by hydrogen bond stretching vibration and a negative signal caused by hydrogen bond bending vibration, indicating that the polarizability perturbation of water presents competing contributions under bending and stretching conditions. A Kerr coefficient equation related to the intermolecular modes of water is established. The ultrafast intermolecular hydrogen bond dynamics of water revealed by an ultrabroadband THz pump pulse can provide further insights into the transient structure of liquid water corresponding to the pertinent modes.

show abstract

“…The needs of the THz technology require, however, extension of the range of the available techniques and materials, in order to provide a flexible design required in multifarious applications. Following this line, investigations of THz generation in various media such as water [17], strongly magnetized plasma [18], and centro-symmetric two-photon res- * gusakov@mbi-berlin.de onant molecular impurities [19] were performed. Emission of terahertz radiation with broad bandwidth by femtosecond photoexcitation of spintronic materials (ferromagnetic and synthetic multiferroic heterostructures) was also reported recently [20,21].…”

Section: Introductionmentioning

confidence: 99%

Unified Model for a Nonlinear Pulse Propagation in Composites and Optimization of THz Generation

Husakou¹,

Федотова²,

Rusetsky³

et al. 2023

Preprint

View full text Add to dashboard Cite

We describe a unified numerical model which allows fast and accurate simulation of nonlinear light propagation in nanoparticle composites, including various effects such as group velocity dispersion, second-and third-order nonlinearity, quasi-free-carrier formation and plasma contribution, exciton dynamics, scattering and so on. A developed software package SOLPIC is made available for the community. Using this model, we analyze and optimize efficient generation of THz radiation by two-color pulses in ZnO/fused silica composite, predicting an efficiency of 3%. We compare the role of various nonlinear effects contributing to the frequency conversion, and show that optimum conditions of THz generation differ from those expected intuitively.

show abstract

Observation of broadband terahertz wave generation from liquid water

Cited by 7 publications

References 11 publications

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

Observation of extremely efficient terahertz generation from mid-infrared two-color laser filaments

Ultrafast hydrogen bond dynamics of liquid water revealed by terahertz-induced transient birefringence

Unified Model for a Nonlinear Pulse Propagation in Composites and Optimization of THz Generation

Contact Info

Product

Resources

About