Abstract Ultrafast extreme ultraviolet (XUV) sources with a controllable polarization state are powerful tools for investigating the structural and electronic as well magnetic properties of materials. However, such light still limited to only few free-electron laser facilities and, very recently, high-order harmonic generation from noble gases. Here we propose numerically demonstrate laser–plasma scheme generate bright XUV pulses fully controlled polarization. In this scheme, an elliptically...

Mid-infrared (MIR) ultra-short pulses with multiple spectral-band coverage and good freedom in spectral temporal shaping are desired by broad applications such as steering strong-field ionization, investigating bound-electron dynamics, minimally invasive tissue ablation. However, the existing methods of light transient generation lack tuning require sophisticated apparatus for complicated phase noise control. Here, both numerical analysis experimental demonstration, we report first attempt,...

Relativistically intense laser-driven plasma mirrors offer a promising route to produce attosecond pulses with high brightness. One major challenge is generate an isolated pulse instead of train when using multicycle driving lasers. Here we numerically demonstrate scheme achieve this goal by Airy laser beams, whose main intensity self-bends transversely during propagation. The generated are well separated in space and emitted different directions. This has the advantage weak dependence on...

Against the backdrop of rapid growth in food processing and biofuel industries across many countries, global palm oil market has become a critical component international agricultural trade. This study analyzes evolution trade network using data from 182 countries identifies associated influencing mechanisms to ensure security supply chain. The main findings are as follows: (1) over past two decades, increasingly taken on single, large-community structure, reflecting trends toward...

This work implements an intelligent forest monitoring system using the Internet of things (IoT) with wireless network communication technology a low-power wide-area (LPWAN), long range (LoRa), and narrow-band (NB-IoT). A solar micro-weather station LoRa-based sensors communications was built to monitor status information such as light intensity, air pressure, ultraviolet CO2, etc. Moreover, multi-hop algorithm for is proposed solve problem long-distance without 3G/4G. For electricity, we...

We introduce two-color counterrotating circularly polarized laser fields as a new way to spectrally control high harmonic generation (HHG) from relativistic plasma mirrors. Through particle-in-cell simulations, we show that only selected group of orders can appear owing the symmetry and related conservation laws. By adjusting intensity ratio two driving field components, demonstrate overall HHG efficiency, relative allowed neighboring orders, polarization state source be tuned. The...

Circularly polarized extreme ultraviolet (XUV) radiation is highly interesting for investigation of chirality-sensitive light-matter interactions. Recent breakthroughs have enabled generation such light sources via high harmonic (HHG) from rare gases. There a growing interest in extending HHG medium gases to solids, especially 2D materials, as they hold great promise develop ultra-compact solid-state photonic devices and provide insights into electronic properties the materials themselves....

High harmonic generation and enhancement by tuning the interlayer separation in two-dimensional van der Waals heterostructures are investigated.

Upon the interaction of 60 TW Ti: sapphire laser pulses with 4 mm long supersonic nitrogen gas jet, a directional x-ray emission was generated along generation stable quasi-monoenergetic electron beams having peak energy 130 MeV and relative spread ∼ 20%. The betatron had small divergence 7.5 mrad critical keV. wakefield acceleration process stimulated in background plasma density merely 5.4 × 1017 cm−3 utilizing ionization injection. non-self-focusing propagation pulse pure gaseous should...

The production of intense isolated attosecond pulse is a major goal in ultrafast research. Recent advances high harmonic generation from relativistic plasma mirrors under oblique incidence interactions gave rise to photon-rich pulses with circular or elliptical polarization. However, achieve an via polarization gating using currently available long driving remains challenge, because harmonics plasmas assumed only possible at normal near-normal incidence. Here we numerically demonstrate...

Target-normal sheath acceleration (TNSA) of ions by >100-fs relativistic laser pulses irradiating a multichannel target consisting row parallel long wires and plane back foil is studied. Two-dimensional particle-in-cell simulations show that the light pulls out from large number dense hot attosecond electron bunches, which are synergetically accelerated forward ponderomotive force as well longitudinal electric field transverse magnetic mode excited in vacuum channels between wires....

Outbreaks of avian influenza virus (AIV) have raised public concerns recently. Airborne AIV has been evaluated in live poultry markets and case farms; however, no study discussed airborne ambient air the winter habitats migratory birds. Therefore, this aimed to evaluate AIV, specifically H5, H7, H9, a critical habitat birds assess factors influencing transmission provide novel insights into epidemiology influenza. A total 357 samples were collected Aogu Wetland, Taiwan, Republic China,...

Abstract An ultra-low pump intensity and high photon flux have been long pursuits of harmonic generation (HHG) in solids. However, there is lack a criterion to identify pristine solid material exhibiting such characteristics. Here, we report systematic investigation into HHG from cadmium telluride (CdTe) bulk crystal with flat band dispersion near the Fermi level which leads large density states. The measured for 31 st harmonics (229 nm) only 75 GW/cm 2 , one order magnitude lower than that...

A scheme to generate high field terahertz (THz) pulses by using tailored laser interaction with a gas target is proposed. The wakefield based THz source emitted from the asymmetric shape induced plasma transverse transient net currents. Particle-in-cell simulations show that emission electric filed strength over 1 GV/cm can be obtained incident at 1×1019 W/cm2 level, and corresponding energy conversion efficiency more than 10−4. intensity scaling holds up strengths. Such also has broad...

The microwave radiation mechanism in a Cu-based foil target irradiated by an intense laser pulse has been investigated. Microwave emission the frequency range 0.5–4 GHz observed from 200 ps of intensity about 1012 W cm− 2 normally incident on surface. total power and energy emitted interaction were found to be 0.4 nJ, respectively, corresponding efficiency coupling 2×10−8. result agrees well with quadrupole calculated based circuit model plasma, which indicates that radiative process can...

It is well known that light can possess spin angular momentum (SAM) and orbital (OAM) in the longitudinal direction. Interesting novel with transverse SAM or OAM has also been discovered recently, latter being called spatiotemporal optical vortices. Here we present a route to generate vortices by means of high harmonic generation from relativistic laser plasma interactions. Three-dimensional particle-in-cell simulations show evidence edge dislocations wave front structures circulating energy...

Identifying all-optical high-order harmonic observables as reliable signatures to probe the topology of matter has triggered intense interest. Recently, extensive ab initio simulations challenged previously explored approaches and proposed a new potential feature, i.e., angular dependence yield, possible fingerprint material [O. Neufeld et al., Phys. Rev. X 13, 031011 (2023)]. However, nontopological contributions from band structure, spin-orbit coupling (SOC), Berry curvature have not been...

Coherent focusing of high-order harmonic generation (HHG) from optically curved relativistic plasma mirrors provides a promising route to achieve unprecedented high intensities, opening up prospects study phenomena occurring in extremely strong fields, the region which is however limited within small spatial and temporal scales. Here through three-dimensional particle-in-cell simulations we demonstrate HHG driven by Bessel-Gaussian beams exhibiting intriguing feature self-healing extreme...

The influences of lateral target size on hot electron production and electromagnetic pulse emission from laser interaction with metallic targets have been investigated. Particle-in-cell simulations at high intensities show that the yield electrons tends to increase size, because larger surface area reduces electrostatic field target, owing its expansion along surface. At lower longer time scales, experimental data characterizing as a function also target-size effects. Charge separation...

During the interaction of a relativistic circularly polarized laser pulse with an overdense plasma target, longitudinal motion bunches electrons under action light pressure and electrostatic restore force can emit intense terahertz (THz) pulses. This mechanism allows high pump intensity large electron number participating in emission. Two-dimensional particle-in-cell simulations are carried out to investigate THz The results suggest that such source produce remarkably pulses energy several...

We propose a method to generate high field terahertz (THz) radiation with peak strength of GV/cm level in the THz frequency gap range 1-10 using relativistic laser interaction gaseous plasma target. Due effect local pump depletion, an initially Gaussian pulse undergoes leading edge erosion and eventually evolves state being step function. Interacting such pulse, electrons gain transverse residual momentum excite net currents modulated by frequency. These give rise low emission. demonstrate...

Structural chirality plays an important role in solid state physics and leads to a variety of novel physics. The feasibility probing structural crystals using high harmonic generation solids is explored this work. Through first-principles calculations based on the time-dependent density functional theory framework, we demonstrate that evident circular dichroism (CD) effects can be induced spectra from chiral crystal -- bulk tellurium. CD signal reverses for with opposite chirality. Besides,...

Perovskite has emerged as an outstanding light-absorbing material, leading to significant advancements in solar cell efficiency. Further improvements can be made by restructuring the internal optical properties of perovskite. In this study, we investigate impact gold triangle nanostructures on perovskite absorption rates, and explore optimization surface plasmon resonance enhance its Our numerical simulations revealed that stacking film resulted a increase rate. Finally, comparative testing...