Metal Nanoplasmas as Bright Sources of Hard X-Ray Pulses

Rajeev, P. P.; Taneja, Praveen; Ayyub, Pushan; Sandhu, Arvinder; Kumar, G. Ravindra

doi:10.1103/physrevlett.90.115002

Cited by 139 publications

(99 citation statements)

References 32 publications

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“…There is a substantial body of experimental work on the effect of surface roughness of targets on laser-plasma coupling, including the laser absorption and the production efficiency and energy spectrum of the generated xrays or ions [14][15][16][17][18][19][20][21]. Various simulation works attribute the observed improvement to a surface area increase and the local field enhancement introduced by the roughness [22][23][24][25].…”

Section: B Target Designmentioning

confidence: 99%

Effects of front-surface target structures on properties of relativistic laser-plasma electrons

et al. 2014

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We report the results of a study of the role of prescribed geometrical structures on the front of a target in determining the energy and spatial distribution of relativistic laser-plasma electrons. Our 3D PIC simulation studies apply to short-pulse, high intensity laser pulses, and indicate that a judicious choice of target front-surface geometry provides the realistic possibility of greatly enhancing the yield of high energy electrons, while simultaneously confining the emission to narrow (< 5• ) angular cones.

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Section: B Target Designmentioning

confidence: 99%

Effects of front-surface target structures on properties of relativistic laser-plasma electrons

et al. 2014

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“…Other types of structured targets have also been successfully used to increase absorption, as evidenced by enhanced x-ray emission from "smoked" targets (16), nanospheres (17), gratings (18,19), and "velvet" nanowire targets (20)(21)(22)(23). However, high-aspect-ratio vertically aligned nanostructures with vacant spaces surrounding them are unique in allowing for the deep penetration of ultrafast optical laser pulse energy into the material, where light is trapped and practically totally absorbed (24).…”

Section: Introductionmentioning

confidence: 99%

Energy Penetration into Arrays of Aligned Nanowires Irradiated with Relativistic Intensities: Scaling to Terabar Pressures

Bargsten

Hollinger

Capeluto

et al. 2016

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Ultrahigh-energy density (UHED) matter, characterized by energy densities >1 × 10 8 J cm −3 and pressures greater than a gigabar, is encountered in the center of stars and inertial confinement fusion capsules driven by the world's largest lasers. Similar conditions can be obtained with compact, ultrahigh contrast, femtosecond lasers focused to relativistic intensities onto targets composed of aligned nanowire arrays. We report the measurement of the key physical process in determining the energy density deposited in high-aspect-ratio nanowire array plasmas: the energy penetration. By monitoring the x-ray emission from buried Co tracer segments in Ni nanowire arrays irradiated at an intensity of 4 × 10 19 W cm, we demonstrate energy penetration depths of several micrometers, leading to UHED plasmas of that size. Relativistic three-dimensional particle-in-cell simulations, validated by these measurements, predict that irradiation of nanostructures at intensities of >1 × 10 22 W cm −2 will lead to a virtually unexplored extreme UHED plasma regime characterized by energy densities in excess of 8 × 10 10 J cm −3

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“…The x-rays are useful as a micron sized x-ray source which has many potential applications like time resolved x-ray diffraction studies and x-ray lithography. Since the absorption of the high intensity (～10 17 W/cm 2 ) ultrashort laser pulses (～100 fs) by planar solid targets is considerably low (～10-20% at normal incidence) [4,5], various types of targets like gratings [6], structured targets [7], predeposited metal clusters [8], gas clusters [9], snow clusters [10] etc. have been used to enhance the coupling of the laser energy in matter.…”

Section: Introductionmentioning

confidence: 99%

Efficient keV X-ray Generation from Irradiation of in-situ Produced Silver Clusters by Ti:sapphire Laser Pulses

Chakravarty¹,

Naik²,

Kumbhare³

et al. 2009

Journal of the Optical Society of Korea

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An experimental study of energy absorption and x-ray emission from ultrashort laser pulse irradiation of in-situ produced solid clusters has been performed. Silver clusters produced by a 30 mJ, 300 ps laser pulse were irradiated up to an intensity of 3×10 17 W/cm 2 by a 70 mJ, 45 fs compressed laser pulse from the same Ti:sapphire laser. Absorption of the laser light exceeding 70% was observed, resulting in an x-ray yield (>1 keV) of ~60 μJ/ pulse. This may constitute a much simpler means of intense x-ray generation using ultrashort laser pulses as compared to the irradiation of structured / pre-deposited cluster targets, and it offers higher x-ray conversion efficiency than that from gas clusters and planar solid targets.

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Metal Nanoplasmas as Bright Sources of Hard X-Ray Pulses

Cited by 139 publications

References 32 publications

Effects of front-surface target structures on properties of relativistic laser-plasma electrons

Effects of front-surface target structures on properties of relativistic laser-plasma electrons

Energy Penetration into Arrays of Aligned Nanowires Irradiated with Relativistic Intensities: Scaling to Terabar Pressures

Efficient keV X-ray Generation from Irradiation of in-situ Produced Silver Clusters by Ti:sapphire Laser Pulses

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