Generation of Elliptically Polarized Terahertz Waves from Laser-Induced Plasma with Double Helix Electrodes

Lu, Xiaofei; Zhang, Xicheng

doi:10.1103/physrevlett.108.123903

Cited by 59 publications

(27 citation statements)

References 18 publications

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“…(3). Recent experiments in air [19] have indicated n air − 1 ≈ 1.7 × 10 −4 at THz frequencies, which is similar to the zero frequency limit of Eq. (3), n(0) − 1 = 2.78 × 10 −4 .…”

Section: B Materials Response Of Molecular Nitrogensupporting

confidence: 70%

THz generation by optical Cherenkov emission from ionizing two-color laser pulses

et al. 2013

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Section: B Materials Response Of Molecular Nitrogensupporting

confidence: 70%

THz generation by optical Cherenkov emission from ionizing two-color laser pulses

et al. 2013

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“…Furthermore, the THz polarization was investigated with a wire grid THz polarizer exploiting the inherent polarization sensitivity of EO detection as described in ref. [10]. It is important to notice that in our setup we were not able to collect the whole THz emission from the micro-plasma, so we could only infer the overall polarization of the THz beam with the information retrieved from a portion of it.…”

Section: Resultsmentioning

confidence: 98%

THz wave generation from micro-plasma

Buccheri

Zhang

2014

SPIE Proceedings

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We investigated the broadband terahertz (THz) emission from sub millimeter laser-induced plasmas. The angular dependent emission from the source was characterized with coherent detection, showing that the radiation pattern peak is located 80 degrees away the propagation direction of the excitation laser. Our findings support the laser ponderomotive force as the main driver for the generation of THz transients. We report the measurement of THz waveforms generated in ambient air with laser excitation energies as low as 660 nJ. The experimental results suggest the laser-induced microplasma as a promising approach to reduce the laser threshold typical of THz air photonics systems of many orders of magnitude, with the result of scaling down the cost of broadband terahertz spectroscopy.

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“…The low-frequency broadband spectrum is determined by the constructive interference of the attosecond electron bursts whose timing is controllable by detuning the frequencies of the two-color pulses [10,11]. Based on the transient photocurrent model, schemes of controlling the THz polarization and spectrum have been proposed [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Revealing plasma oscillation in THz spectrum from laser plasma of molecular jet

Li¹,

Bai²,

Miao³

et al. 2016

Opt. Express

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Contribution of plasma oscillation to the broadband terahertz (THz) emission is revealed by interacting two-color (ω/2ω) laser pulses with a supersonic jet of nitrogen molecules. Temporal and spectral shifts of THz waves are observed as the plasma density varies. The former owes to the changing refractive index of the THz waves, and the latter correlates to the varying plasma frequency. Simulation of considering photocurrents, plasma oscillation and decaying plasma density explains the broadband THz spectrum and the varying THz spectrum. Plasma oscillation only contributes to THz waves at low plasma density owing to negligible plasma absorption. At the longer medium or higher density, the combining effects of plasma oscillation and absorption results in the observed low-frequency broadband THz spectra.

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Generation of Elliptically Polarized Terahertz Waves from Laser-Induced Plasma with Double Helix Electrodes

Cited by 59 publications

References 18 publications

THz generation by optical Cherenkov emission from ionizing two-color laser pulses

THz generation by optical Cherenkov emission from ionizing two-color laser pulses

THz wave generation from micro-plasma

Revealing plasma oscillation in THz spectrum from laser plasma of molecular jet

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