Enhanced absorption of intense short-pulse laser light by subwavelength nanolayered target

Cao, Lihua; Gu, Yuqiu; Zhao, Ziqi; Huang, Wenzhong; Zhou, Weimin; He, X. T.; Yu, Wei; Yu, M. Y.

doi:10.1063/1.3360298

Cited by 53 publications

(21 citation statements)

References 31 publications

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“…31 The difference can be attributed to the fact that the hot electrons pulled out of the nanolayer surfaces and accelerated by the laser fields can propagate robustly along the latter for a relatively long distance. 20 For the planar target, the surface area exposed to the laser light is much less and there is only a small number ͑if at all, depending on the laser polarization and angle of incidence͒ of target-surface electrons that can be pulled out and accelerated directly by the laser field. The NT, on the other hand, has a very large laser penetration length ͑or effective skin depth͒ in the direction of laser propagation.…”

Section: Dependence On the Laser Intensity And Pulse Durationmentioning

confidence: 99%

“…The substrate part of the NT is omitted in order to isolate the effect of the structured surface. 20 In the 2D3V ͑two dimension in space and three dimension in velocity͒ PIC simulation, 29 the NT is assumed to be preionized Cu 5+ plasma at 50n c density, where n c is the critical density at the laser wavelength = 800 nm. The width and length of the plasma layers are d 1 = 0.1-0.9 and L =5-25, respectively, and the interlayer vacuum spacing is…”

Section: Simulation Parametersmentioning

confidence: 99%

“…14 An important issue in almost all applications is to have high conversion efficiency for laser-to-hot electron energy. Different types of targets have been proposed, including targets with subwavelength gratings, 15 velvet surfaces, 16 holes 17 and nanoholes, 18 nanotubes 19 and nanobrush or nanolayered 20 as well as targets made of porous silicon, 21 clusters, 22 low-density foam, 23 etc. The intense induced fields in many of these configurations lead to electron heating, guiding, and collimation, [24][25][26][27][28] since the strength and the resulting characteristics of the hot electrons depend on the laser intensity.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, enhanced absorption by the nanolayered target is due to the very large number of target electrons ͑originally inside the surfaces of the horizontal nanolayers͒ pulled out by the laser electric field into the narrow vacuum gaps between the layers and accelerated forward, as well as the self-generated guide fields there. 20 In this paper, using two-dimensional ͑2D͒ particle-in-cell ͑PIC͒ simulation we consider the effect of the laser and nanolayered target ͑NT͒ parameters on laser-energy absorption by the target electrons. The dependence of the laser absorption and energy conversion efficiency on the laser intensity and pulse duration, width, interlayer spacing, and length of the nanolayers is investigated.…”

Section: Introductionmentioning

confidence: 99%

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Control of the hot electrons produced by laser interaction with nanolayered target

Cao

Zhao

et al. 2010

Physics of Plasmas

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Hot electrons generated by short-pulse-laser interaction with nanolayered target (NT) are investigated using two-dimensional particle-in-cell simulation. Compared to the planar target, the NT leads to more efficient conversion of laser energy to the kinetic energy of the accelerated electrons. However, the energy absorption by the NT decreases at both too-low and too-high laser intensities. At lower laser intensities it is because of the weaker electric and magnetic fields generated by the hot-electron jets and smaller relativistic skin depth. At higher laser intensities it is because of the damage or destruction of the layered structure by the laser field. On the other hand, the dependence of the conversion efficiency and hot-electron number on the duration of the (short) laser pulse and the nanolayer length is weak. Control of the hot-electron characteristics by tailoring the parameters of the laser and the NT is discussed.

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Section: Dependence On the Laser Intensity And Pulse Durationmentioning

confidence: 99%

Section: Simulation Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Control of the hot electrons produced by laser interaction with nanolayered target

Cao

Zhao

et al. 2010

Physics of Plasmas

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“…Nanostructuring the surface of the target can lead to an enhancement in the coupling efficiency by almost 100% [11] as surface plasmon excitation and lightning rod effect locally intensify the incident electric field. Similar efforts have been made to enhance the laser coupling by using other types of structured targets based on subwavelength grating [12], nanoparticles [13], nanorods [14], nanowires [15], carbon nanotubes [16], multinanolayers [17] and nanoporous materials [18]. The second aspect related to the physics of fast electron transport depends crucially on the background electrical conductivity of the medium.…”

Section: Introductionmentioning

confidence: 99%

Enhanced transport of relativistic electrons through nanochannels

Singh

Chakraborty

Chatterjee

et al. 2013

Phys. Rev. ST Accel. Beams

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Efficient transport of fast electrons driven by intense laser solid interaction depends crucially on optimal target design. We demonstrate a hybrid target design that incorporates two important featuresefficient generation of relativistic electrons and their unimpeded transport in dense media. The target was fabricated on a porous alumina base consisting of an array of sublambda cylindrical holes partially filled with Cu nanorods, such that light field propagates in the hollow channels, located ahead of the metallic fillings. The hollow array acts as an efficient source of hot electrons when driven by relativistically intense, femtosecond laser pulses and shows a 60-fold enhancement in electron flux compared to a solid target. This enhancement is ascribed to an increased penetration of laser through subwavelength pores and enhanced local electric fields. The metal doped part facilitates efficient transport of the generated electrons, due to its large background conductivity. A 4-fold enhancement in target rear side electron flux is observed compared with unfilled porous alumina.

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Towards optimization of femtosecond laser pulse nanostructuring of targets for high-intensity laser experiments in vacuum

et al. 2021

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The interaction of intense femtosecond laser pulses with solid targets is a topic that has attracted a large amount of interest in science and applications. For many of the related experiments a large energy deposition or absorption as well as an efficient coupling to extreme ultraviolet (XUV), X-ray photon generation, and/or high energy particles is important. Here, much progress has been made in laser development and in experimental schemes, etc. However, regarding the improvement of the target itself, namely its geometry and surface, only limited improvements have been reported. The present paper investigates the formation of laser-induced periodic surface structures (LIPSS or ripples) on polished thick copper targets by femtosecond Ti:sapphire laser pulses. In particular, the dependence of the ripple period and ripple height has been investigated for different fluences and as a function of the number of laser shots on the same surface position. The experimental results and the formation of ripple mechanisms on metal surfaces in vacuum by femtosecond laser pulses have been analysed and the parameters of the experimentally observed “gratings” interpreted on base of theoretical models. The results have been specifically related to improve high-intensity femtosecond-laser matter interaction experiments with the goal of an enhanced particle emission (photons and high energy electrons and protons, respectively). In those experiments the presently investigated nanostructures could be generated easily in situ by multiple pre-pulses irradiated prior to a subsequent much more intense main laser pulse.

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Enhanced absorption of intense short-pulse laser light by subwavelength nanolayered target

Cited by 53 publications

References 31 publications

Control of the hot electrons produced by laser interaction with nanolayered target

Control of the hot electrons produced by laser interaction with nanolayered target

Enhanced transport of relativistic electrons through nanochannels

Towards optimization of femtosecond laser pulse nanostructuring of targets for high-intensity laser experiments in vacuum

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