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

Koulouklidis, Anastasios D.; Gollner, Claudia; Shumakova, Valentina; Fedorov, Vladimir Yu.; Pugžlys, Audrius; Baltuška, Andrius; Tzortzakis, S.

doi:10.1038/s41467-019-14206-x

Cited by 239 publications

(141 citation statements)

References 59 publications

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“…In 2020, Koulouklidis et al demonstrated two-color filamentation of femtosecond mid-infrared laser pulses at 3.9 μm generating ultrashort [68] sub-cycle THz pulses with sub-milijoule energy. The results showed THz conversion efficiency of 2.36%, resulting in THz field amplitudes above 100 MV cm − 1 [75].…”

Section: Optimization Of Thz Systemmentioning

confidence: 96%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

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Section: Optimization Of Thz Systemmentioning

confidence: 96%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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“…Dey et al [59] demonstrated enhanced broadband intense THz generation by filamentation in liquids, with about 1 µJ/pulse/THz and spanning from~0.1 to 50 THz (see the dark gray plot in Figure 1c. Recently, Koulouklidis et al [60] proposed an extremely brilliant THz source by two color filamentation of MIR laser pulses with the fundamental wavelength set to 3.9 µm. Conversion efficiency above 2% and electric fields of more than 100 MV/cm were demonstrated spanning between ca.…”

Section: Introductionmentioning

confidence: 99%

Towards Intense THz Spectroscopy on Water: Characterization of Optical Rectification by GaP, OH1, and DSTMS at OPA Wavelengths

2020

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Water is the most prominent solvent. The unique properties of water are rooted in the dynamical hydrogen-bonded network. While TeraHertz (THz) radiation can probe directly the collective molecular network, several open issues remain about the interpretation of these highly anharmonic, coupled bands. In order to address this problem, we need intense THz radiation able to drive the liquid into the nonlinear response regime. Firstly, in this study, we summarize the available brilliant THz sources and compare their emission properties. Secondly, we characterize the THz emission by Gallium Phosphide (GaP), 2–{3–(4–hydroxystyryl)–5,5–dimethylcyclohex–2–enylidene}malononitrile (OH1), and 4–N,N–dimethylamino–4′–N′–methyl–stilbazolium 2,4,6–trimethylbenzenesulfonate (DSTMS) crystals pumped by an amplified near-infrared (NIR) laser with tunable wavelength. We found that both OH1 as well as DSTMS could convert NIR laser radiation between 1200 and 2500 nm into THz radiation with high efficiency (> 2 × 10−4), resulting in THz peak fields exceeding 0.1 MV/cm for modest pump excitation (~ mJ/cm2). DSTMS emits the broadest spectrum, covering the entire bandwidth of our detector from ca. 0.5 to ~7 THz, also at a laser wavelength of 2100 nm. Future improvements will require handling the photothermal damage of these delicate organic crystals, and increasing the THz frequency.

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“…Powerful terahertz radiation sources have attracted considerable attention due to their applications in many fields of science [1][2][3], such as THz spectroscopy of condensed matter or biological issues [4][5][6], nonlinear THz optics [7], and resonant control of materials [8,9]. Conventional laser-based THz radiation sources include optical rectification from nonlinear crystals [10][11][12], two-color laser filamentation [13,14], and switched photoconducting antennnas [15]. The peak fields are limited to the order of a few MV/cm, and the radiation energies are smaller than 1 mJ.…”

Section: Introductionmentioning

confidence: 99%

Relativistic terahertz radiation generated by direct-laser-accelerated electrons from laser-foil interactions

2020

Phys. Rev. A

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A scheme for generating powerful terahertz (THz) radiation based on laser-solid interactions is proposed. When a p-polarized femtosecond laser impinges obliquely on a plane solid target and the target partially blocks the laser energy, surface electrons are extracted to the vacuum and accelerated by the laser fields, forming a low-divergence electron beam. A half-cycle THz radiation pulse is emitted simultaneously as the beam passes by the edge of the target, due to a mechanism similar to coherent transition radiation. Our particle-in-cell simulations show that a relativistic THz pulse can be obtained with an energy of a few tens of millijoule and a conversion efficiency above 1%, with existing joule level femtosecond laser sources.

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

Cited by 239 publications

References 59 publications

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Towards Intense THz Spectroscopy on Water: Characterization of Optical Rectification by GaP, OH1, and DSTMS at OPA Wavelengths

Relativistic terahertz radiation generated by direct-laser-accelerated electrons from laser-foil interactions

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