Direct laser acceleration of electrons in the plasma bubble by tightly focused laser pulses

AbstractA double-slice-foil target is proposed for the generation of quasi-monoenergetic proton bunches by intense laser pulses. In this new target structure, two symmetrical solid slices are adjoined obliquely to the front side of a plane double-layer target. Two-dimensional particle-in-cell simulations show that a large number of hot electrons are pulled out from solid slices and accelerated forward by direct laser acceleration, which lead to significant enhancement of the sheath field and the produced proton beam energy as compared with the normal plane double-layer target and some other modified targets. It appears that well-collimated proton bunches with energy larger than 200 MeV can be produced at the focused laser intensity of about 1021W/cm2 with the proposed target design.

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The generation of mono-energetic electron beams from ultrashort pulse laser–plasma interactions

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2005.1730 ◽

2006 ◽

Vol 364 (1840) ◽

pp. 663-677 ◽

Cited By ~ 9

Author(s):

S.P.D Mangles ◽

K Krushelnick ◽

Z Najmudin ◽

M.S Wei ◽

B Walton ◽

...

Keyword(s):

Plasma Wave ◽

Pulse Length ◽

Energetic Electron ◽

Laser Pulses ◽

Relativistic Electrons ◽

Ultrashort Pulse Laser ◽

Laser Plasma Interactions ◽

Direct Laser ◽

High Intensity Laser ◽

Laser Acceleration

The physics of the interaction of high-intensity laser pulses with underdense plasma depends not only on the interaction intensity but also on the laser pulse length. We show experimentally that as intensities are increased beyond 10 20 W cm −2 the peak electron acceleration increases beyond that which can be produced from single stage plasma wave acceleration and it is likely that direct laser acceleration mechanisms begin to play an important role. If, alternatively, the pulse length is reduced such that it approaches the plasma period of a relativistic electron plasma wave, high-power interactions at much lower intensity enable the generation of quasi-mono-energetic beams of relativistic electrons.

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Synergistic Laser-Wakefield and Direct-Laser Acceleration in the Plasma-Bubble Regime

Physical Review Letters ◽

10.1103/physrevlett.114.184801 ◽

2015 ◽

Vol 114 (18) ◽

Cited By ~ 50

Author(s):

Xi Zhang ◽

Vladimir N. Khudik ◽

Gennady Shvets

Keyword(s):

Plasma Bubble ◽

Direct Laser ◽

Laser Wakefield ◽

Laser Acceleration ◽

Bubble Regime

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Regulating disordered plasmonic nanoparticles into polarization sensitive metasurfaces

Nanophotonics ◽

10.1515/nanoph-2020-0651 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Shulei Li ◽

Mingcheng Panmai ◽

Shaolong Tie ◽

Yi Xu ◽

Jin Xiang ◽

...

Keyword(s):

Femtosecond Laser ◽

Spatial Resolution ◽

Metallic Nanoparticles ◽

Near Infrared ◽

Optical Memory ◽

Laser Pulses ◽

Femtosecond Laser Pulses ◽

Optical Diffraction ◽

Plasmonic Nanoparticles ◽

Direct Laser

Abstract Metasurfaces composed of regularly arranged and deliberately oriented metallic nanoparticles can be employed to manipulate the amplitude, phase and polarization of an incident electromagnetic wave. The metasurfaces operating in the visible to near infrared spectral range rely on the modern fabrication technologies which offer a spatial resolution beyond the optical diffraction limit. Although direct laser writing is an alternative to the fabrication of nanostructures, the achievement of regular nanostructures with deep-subwavelength periods by using this method remains a big challenge. Here, we proposed and demonstrated a novel strategy for regulating disordered plasmonic nanoparticles into nanogratings with deep-subwavelength periods and reshaped nanoparticles by using femtosecond laser pulses. The orientations of the nanogratings depend strongly on the polarization of the femtosecond laser light. Such nanogratings exhibit reflection and polarization control over the reflected light, enabling the realization of polarization sensitive optical memory and color display with high spatial resolution and good chromacity.

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Optical Waveguides Embedded in PCBs - A Real World Application of 3D Structures Written by TPA

MRS Proceedings ◽

10.1557/proc-1054-ff01-04 ◽

2007 ◽

Vol 1054 ◽

Cited By ~ 3

Author(s):

Ruth Houbertz ◽

Herbert Wolter ◽

Volker Schmidt ◽

Ladislav Kuna ◽

Valentin Satzinger ◽

...

Keyword(s):

Optical Fibers ◽

Optical Waveguides ◽

High Speed ◽

Printed Circuit Boards ◽

Data Transfer ◽

Laser Pulses ◽

Photon Absorption ◽

Optical Data ◽

Direct Laser ◽

High Speed Data

ABSTRACTThe integration of optical interconnects in printed circuit boards (PCB) is a rapidly growing field worldwide due to a continuously increasing need for high-speed data transfer. There are any concepts discussed, among which are the integration of optical fibers or the generation of waveguides by UV lithography, embossing, or direct laser writing. The devices presented so far require many different materials and process steps, but particularly also highly-sophisticated assembly steps in order to couple the optoelectronic elements to the generated waveguides. In order to overcome these restrictions, an innovative approach is presented which allows the embedding of optoelectronic components and the generation of optical waveguides in only one optical material. This material is an inorganic-organic hybrid polymer, in which the waveguides are processed by two-photon absorption (TPA) processes, initiated by ultra-short laser pulses. In particular, due to this integration and the possibility ofin situpositioning the optical waveguides with respect to the optoelectronic components by the TPA process, no complex packaging or assembly is necessary. Thus, the number of necessary processing steps is significantly reduced, which also contributes to the saving of resources such as energy or solvents. The material properties and the underlying processes will be discussed with respect to optical data transfer in PCBs.

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Fabrication and Characterization of Woodpile Structures for Direct Laser Acceleration

10.1063/1.3520360 ◽

2010 ◽

Cited By ~ 3

Author(s):

C. McGuinness ◽

E. Colby ◽

B. Cowan ◽

R. J. England ◽

J. Ng ◽

...

Keyword(s):

Direct Laser ◽

Laser Acceleration ◽

Fabrication And Characterization

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Two-Photon Polymerization of Albumin Hydrogel Nanowires Strengthened with Graphene Oxide

Biomimetics ◽

10.3390/biomimetics6040066 ◽

2021 ◽

Vol 6 (4) ◽

pp. 66

Author(s):

Nikita Nekrasov ◽

Natalya Yakunina ◽

Vladimir Nevolin ◽

Ivan Bobrinetskiy ◽

Pavel Vasilevsky ◽

...

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Femtosecond Laser ◽

Laser Pulses ◽

Femtosecond Laser Pulses ◽

Nanoelectromechanical Systems ◽

Force Microscopy ◽

Two Photon ◽

Direct Laser ◽

Two Photon Polymerization

Multifunctional biomaterials can pave a way to novel types of micro- and nanoelectromechanical systems providing benefits in mimicking of biological functions in implantable, wearable structures. The production of biocomposites that hold both superior electrical and mechanical properties is still a challenging task. In this study, we aim to fabricate 3D printed hydrogel from a biocomposite of bovine serum albumin with graphene oxide (BSA@GO) using femtosecond laser processing. We have developed the method for functional BSA@GO composite nanostructuring based on both two-photon polymerization of nanofilaments and direct laser writing. The atomic-force microscopy was used to probe local electrical and mechanical properties of hydrogel BSA@GO nanowires. The improved local mechanical properties demonstrate synergistic effect in interaction of femtosecond laser pulses and novel composite structure.

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