Control of Strong-Laser-Field Coupling to Electrons in Solid Targets with Wavelength-Scale Spheres

Sumeruk, H. A.; Kneip, S.; Symes, D. R.; Churina, I. V.; Belolipetski, A.; Donnelly, Thomas D.; Ditmire, T.

doi:10.1103/physrevlett.98.045001

Cited by 57 publications

(43 citation statements)

References 20 publications

(21 reference statements)

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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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“…It has been well established 12 that for Mie sized targets, a hot ion population is produced with energies of up to 1-2 MeV. Furthermore, studies of hard x-ray yield by irradiation of Mie size targets have shown that Mie effects can enhance hot electron number and temperature, 13,14 indicating a more efficient coupling of laser energy into the target when the appropriate size is used. The increase in coupling efficiency is thought to be due to Mie-like resonances in the field surrounding the target and therefore results in a highly anisotropic generation of hot ions.…”

Section: Introductionmentioning

confidence: 99%

Generation of Mie size microdroplet aerosols with applications in laser-driven fusion experiments

Higginbotham

Semonin

Bruce

et al. 2009

Review of Scientific Instruments

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, "Generation of Mie size microdroplet aerosols with applications in laser-driven fusion experiments," Rev Sci. Instrum., 80, (2009 We have developed a tunable source of Mie scale microdroplet aerosols that can be used for the generation of energetic ions. To demonstrate this potential, a terawatt Ti: Al 2 O 3 laser focused to 2 ϫ 10 19 W / cm 2 was used to irradiate heavy water ͑D 2 O͒ aerosols composed of micron-scale droplets. Energetic deuterium ions, which were generated in the laser-droplet interaction, produced deuterium-deuterium fusion with approximately 2 ϫ 10 3 fusion neutrons measured per joule of incident laser energy.

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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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Control of Strong-Laser-Field Coupling to Electrons in Solid Targets with Wavelength-Scale Spheres

Cited by 57 publications

References 20 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

Generation of Mie size microdroplet aerosols with applications in laser-driven fusion experiments

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

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