Attosecond x-ray source generation from two-color polarized gating plasmonic field enhancement

Feng, Liqiang; Yuan, Minghu; Chu, Tianshu

doi:10.1063/1.4848757

Cited by 39 publications

(15 citation statements)

References 51 publications

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“…[23] in a 4-cycle laser pulse with ω = 0.056 and E 0 = 0.19. In fact, the general structure and the interpretation of the spectrum are independent of the laser frequency and intensity which were used in the earlier studies [39][40][41].…”

Section: Resultsmentioning

confidence: 99%

“…Considering the time profile of attosecond pulses by using an appropriate filter [5] can be an alternative way for the actual measurement of this type of interference and modulation. The selection of trajectories and the time window can further be controlled by polarization gating approach [40].…”

Section: -3mentioning

confidence: 99%

“…However, due to the overlap with emission from the excited atoms and related ionic species, the efficiency of HHG from a reduced sample volume is still not established [36][37][38] in this method. Using mid-infrared lasers, as reported recently [39][40][41], promises to increase the cutoff energy in HHG to distinguish the fluorescence emission of the excited atoms which occur below threshold. Moreover, these lasers allow one to use lower intensities, which may reduce thermal damage of the nanostructure and excitation of the ionic species and the related incoherent emission.…”

Section: Introductionmentioning

confidence: 99%

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Interferences induced by spatially nonhomogeneous fields in high-harmonic generation

Ebadi

2014

Phys. Rev. A

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The high-harmonic spectrum simulated in a few-cycle laser pulse with spatially nonhomogeneous field presents two types of interferences, which characterize different plateaus in the spectrum. One of these plateaus is discernible with the nonequidistant peaks due to the interference of short and long trajectories, while another one is distinguished by a periodicity much larger than the laser frequency arising from trajectories modified by the nonhomogeneous field. Beside, the continuum-continuum harmonic generation appears in the spectrogram in the tunneling regime of the laser parameters. These features bear the tracking of classical trajectories and the complete characterization of emission spectrum, when using nanostructures in attoscience.

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Section: Resultsmentioning

confidence: 99%

Section: -3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interferences induced by spatially nonhomogeneous fields in high-harmonic generation

Ebadi

2014

Phys. Rev. A

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“…As a result, new physics will emerge in two of the most important processes in strong field physics, namely high-order harmonic generation (HHG) and above-threshold ionization (ATI). There has been considerable theoretical work looking at HHG [37][38][39][40][41][42][43][44][45][46][47][48][49][50] and ATI [51][52][53] driven by spatially nonhomogeneous fields. Also, classical approach (numerical) for studies of strong field phenomena driven by spatial non-homogeneous fields has been introduced in [54].…”

Section: Introductionmentioning

confidence: 99%

Electron path control of high-order harmonic generation by a spatially inhomogeneous field

Mohebbi

Malaei

2015

Journal of Modern Optics

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We theoretically investigate the control of high-order harmonics cut-off and as-pulse generation by a chirped laser field using a metallic bow tie-shaped nanostructure. The numerical results show that the trajectories of the electron wave packet are strongly modified, the short quantum path is enhanced, the long quantum path is suppressed and the low modulated spectrum of the harmonics can be remarkably extended. Our calculated results also show that, by confining electron motion, a broadband supercontinuum with the width of 1670 eV can be produced which directly generates an isolated 34 as-pulse without phase compensation. To explore the underlying mechanism responsible for the cut-off extension and the quantum path selection, we perform time-frequency analysis and a classical simulation based on the three-step model.

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“…[18,19] Besides, HHG spectrum can be enhanced by orthogonally polarized two-color field or two-color polarized gating plasmonic field. [20,21] Polarization gating (PG) scheme has been proved to be a powerful method to generate IAP, where a left and a right circularly polarized laser pulse with the same frequency were combined together. [22,23] IAP with a duration of 148 as was obtained in experiment by generalized double optical gating (GDOG), which combines two counterrotating elliptically polarized pulses and a second harmonic field together.…”

Section: Introductionmentioning

confidence: 99%

Broadband-Isolated Attosecond Pulse Generation by Two-Color Elliptically Polarized Laser Pulses

Xia

Miao

2015

Spectroscopy Letters

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We numerically solve the two-dimensional Schrö dinger equation and investigate isolated attosecond pulse generation by combining a left and a right elliptically polarized pulse together. It is found that the plateau of the harmonic spectra can be extended and the quantum paths can be controlled by adjusting ellipticity. A broadband width of about 220 eV is generated for the case that ellipticity equals 0.3, and time-frequency time-frequency analysis shows that only one long quantum path contributes to high-order harmonic generation. By superposing a bandwidth of 60 eV near the cutoff of the harmonic plateau, an attosecond pulse with the duration of about 62 as could be generated.

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Attosecond x-ray source generation from two-color polarized gating plasmonic field enhancement

Cited by 39 publications

References 51 publications

Interferences induced by spatially nonhomogeneous fields in high-harmonic generation

Interferences induced by spatially nonhomogeneous fields in high-harmonic generation

Electron path control of high-order harmonic generation by a spatially inhomogeneous field

Broadband-Isolated Attosecond Pulse Generation by Two-Color Elliptically Polarized Laser Pulses

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