We demonstrate a 13-fold increase in hard x-ray bremsstrahlung (10 - 200 keV) emitted by a copper plasma created by 100 fs, 806 nm pulses at $10^{14}-10^{15}$ Wcm$^{-2}$. This enhancement is achieved by roughening the target surface with copper nanoparticles of ~15 nm size. A simple model that invokes local field modifications by surface plasmon excitation and `lightning rod' effects explains the observed enhancement quantitatively and provides pointers to the design of structured surfaces for maximizing the emission.
Harmonic emission from cluster nanoplasmas subject to intense short laser pulses
研究了短脉冲强红外激光作用下团簇纳米等离子体的谐波辐射。在以前的出版物[M。Kundu等人，Phys. Rev. A 76，033201（2007）]，我们报道了粒子单元模拟结果，其显示当电离和膨胀团簇的Mie等离子体频率与相应的谐波频率共振时，低阶谐波的共振增强。同时，我们发现，高次谐波几乎不存在于光谱中，即使在高强度。目前的文件是集中在分析建模的过程中。我们发现，由于非线性共振的动力学随机性抑制高次谐波的发射。
PIConGPU modeling of nanoplasma formation in helium nanodroplets irradiated by intense femtosecond laser pulses
Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）；Helmholtz-Zentrum Dresden - Rossendorf, Center for Advanced Systems Understanding (CASUS)（德累斯顿-罗森多夫亥姆霍兹中心，先进系统理解中心）；Helmholtz-Zentrum Dresden - Rossendorf（德累斯顿-罗森多夫亥姆霍兹中心）；Institute of Physics, University of Kassel（卡塞尔大学物理研究所）；Department of Physics and Quantum Center of Excellence for Diamond and Emerging Materials, Indian Institute of Technology Madras（马德拉斯印度理工学院物理系与钻石及新兴材料量子卓越中心）；ELI Beamlines facility, The Extreme Light Infrastructure ERIC（极亮基础设施欧洲利益协调实体 ELI光束线设施）
Bright coherent attosecond X-ray pulses from beam-driven relativistic mirrors
ELI Beamlines Facility, Extreme Light Infrastructure ERIC（极光大设施，极端光基础设施欧洲研究共同体）；Faculty of Mathematics and Physics, Charles University（查理大学数学物理学院）；Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague（布拉格捷克理工大学核科学与物理工程学院）；Kansai Photon Science Institute, National Institutes for Quantum Science and Technology（日本量子科学技术研究机构关西光子科学研究所）
Bright dual-pulse betatron X-ray generation from a laser wakefield accelerator
Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）；Zhengzhou University（郑州大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；Tsinghua University（清华大学）
