Guided acceleration of nanoparticles by laser irradiated parallel gold nanorods

2021 ◽  
Author(s):  
Mamta Yadav ◽  
Ashok Kumar ◽  
Subhayan Mandal
Keyword(s):  
Laser Pulse ◽  
Electric Field ◽  
Pulse Duration ◽  
Gold Nanorods ◽  
Ponderomotive Force ◽  
Transverse Component ◽  
High State ◽  
Free Electrons ◽  
Axial Field ◽  
Axis Of Symmetry

Abstract Laser irradiated parallel gold nanorods with interspersed deuterium nanoparticles are shown to offer guided acceleration of nanoparticles. The laser pulse of intensity exceeding 1018W/cm2 at 1 μm wavelength and pulse duration ~30 fs causes full ionization of nanoparticles and high state ionization of gold atoms and pushes out the free electrons via the ponderomotive force. The charged nanorods have an electric field that has transverse component towards the axis of symmetry and axial field outwards. Thus the nanoparticles are accelerated axially while confined transversely. Deuterium beam of a few MeV energy can be produced by this technique.

Formation of NaH Molecules in the Lowest Rovibrational Level of the Ground Electronic State via Short-Range Photoassociation

2014 ◽  
Vol 17 (1) ◽  
pp. 79-92 ◽  
Author(s):  
Jinglun Li ◽  
Yin Huang ◽  
Ting Xie ◽  
Shuo Chai ◽  
Shulin Cong
Keyword(s):  
Electric Field ◽  
Electronic State ◽  
Pulse Duration ◽  
Delay Time ◽  
Short Range ◽  
Excited Electronic State ◽  
Laser Pulses ◽  
Ground Electronic State ◽  
High State ◽  
State Selectivity

AbstractThe formation of NaH molecules in the lowest rovibrational level of the ground electronic state is investigated using a pump-dump photoassociation (PA) scheme. In short-range region, two colliding atoms Na and H are efficiently associated into the NaH molecule in the rovibrational |0,0〉 state of the ground electronic state via the intermediately rovibrational |10,1〉 state of the excited electronic state. The changes of populations with the electric field amplitudes, frequency detunings, dump pulse duration and delay time between two laser pulses are calculated and discussed. The PA probability reaches 0.623 with a high state-selectivity.

Laser pulse duration effects in Xe2+ ions induced by multiphoton absorption at 0.53 μm

1983 ◽  
Vol 44 (11) ◽  
pp. 1247-1255 ◽  
Author(s):  
A. L'Huillier ◽  
L.A. Lompre ◽  
G. Mainfray ◽  
C. Manus
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Laser Pulse Duration ◽  
Multiphoton Absorption

Effect of laser pulse duration on properties of metal and metal carbide nanoparticles obtained by laser in liquid synthesis

2021 ◽  
Vol 138 ◽  
pp. 106916
Author(s):  
M. Curcio ◽  
A. De Bonis ◽  
A. Santagata ◽  
A. Galasso ◽  
R. Teghil
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Laser Pulse Duration ◽  
Metal Carbide

scholarly journals Reconstruction algorithm for tunneling ionization with a perturbation for the time-domain observation of an electric-field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wosik Cho ◽  
Jeong-uk Shin ◽  
Kyung Taec Kim
Keyword(s):  
Laser Pulse ◽  
Electric Field ◽  
Time Domain ◽  
Reconstruction Algorithm ◽  
High Order ◽  
Reconstruction Process ◽  
Tunneling Ionization ◽  
Order Contribution ◽  
High Order Contribution ◽  
The Time Domain

AbstractWe present a reconstruction algorithm developed for the temporal characterization method called tunneling ionization with a perturbation for the time-domain observation of an electric field (TIPTOE). The reconstruction algorithm considers the high-order contribution of an additional laser pulse to ionization, enabling the use of an intense additional laser pulse. Therefore, the signal-to-noise ratio of the TIPTOE measurement is improved by at least one order of magnitude compared to the first-order approximation. In addition, the high-order contribution provides additional information regarding the pulse envelope. The reconstruction algorithm was tested with ionization yields obtained by solving the time-dependent Schrödinger equation. The optimal conditions for accurate reconstruction were analyzed. The reconstruction algorithm was also tested using experimental data obtained using few-cycle laser pulses. The reconstructed pulses obtained under different dispersion conditions exhibited good consistency. These results confirm the validity and accuracy of the reconstruction process.

scholarly journals A laser experiment for studying radiative shocks in astrophysics

2002 ◽  
Vol 20 (2) ◽  
pp. 263-268 ◽  
Author(s):  
X. FLEURY ◽  
S. BOUQUET ◽  
C. STEHLÉ ◽  
M. KOENIG ◽  
D. BATANI ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Experimental Results ◽  
Laboratory Astrophysics ◽  
Laser Pulse Duration ◽  
Radiative Shocks ◽  
Self Similar ◽  
Laser Experiment ◽  
Similar Solutions

In this article, we present a laboratory astrophysics experiment on radiative shocks and its interpretation using simple modelization. The experiment is performed with a 100-J laser (pulse duration of about 0.5 ns) which irradiates a 1-mm3 xenon gas-filled cell. Descriptions of both the experiment and the associated diagnostics are given. The apparition of a radiation precursor in the unshocked material is evidenced from interferometry diagrams. A model including self-similar solutions and numerical ones is derived and fairly good agreements are obtained between the theoretical and the experimental results.

Ablation of transition metal oxides by different laser pulse duration and thin films deposition

2000 ◽  
Vol 154-155 ◽  
pp. 467-472 ◽  
Author(s):  
A Giardini Guidoni ◽  
C Flamini ◽  
F Varsano ◽  
M Ricci ◽  
R Teghil ◽  
...  
Keyword(s):  
Thin Films ◽  
Transition Metal ◽  
Laser Pulse ◽  
Metal Oxides ◽  
Pulse Duration ◽  
Transition Metal Oxides ◽  
Laser Pulse Duration

Factors Controlling Electropermeabilisation of Cell Membranes

2002 ◽  
Vol 1 (5) ◽  
pp. 319-327 ◽  
Author(s):  
M. P. Rols ◽  
M. Golzio ◽  
B. Gabriel ◽  
J. Teissié
Keyword(s):  
Cell Surface ◽  
Electric Field ◽  
Pulse Duration ◽  
Cell Membranes ◽  
Physical Parameters ◽  
Local Exchange ◽  
Physical Mechanisms ◽  
A Cell

Electric field pulses are a new approach for drug and gene delivery for cancer therapy. They induce a localized structural alteration of cell membranes. The associated physical mechanisms are well explained and can be safely controlled. A position dependent modulation of the membrane potential difference is induced when an electric field is applied to a cell. Electric field pulses with an overcritical intensity evoke a local membrane alteration. A free exchange of hydrophilic low molecular weight molecules takes place across the membrane. A leakage of cytosolic metabolites and a loading of polar drugs into the cytoplasm are obtained. The fraction of the cell surface which is competent for exchange is a function of the field intensity. The level of local exchange is strongly controlled by the pulse duration and the number of successive pulses. The permeabilised state is long lived. Its lifetime is under the control of the cumulated pulse duration. Cell viability can be preserved. Gene transfer is obtained but its mechanism is not a free diffusion. Plasmids are electrophoretically accumulated against the permeabilised cell surface and form aggregates due to the field effect. After the pulses, several steps follow: translocation to the cytoplasm, traffic to the nucleus and expression. Molecular structural and metabolic changes in cells remain mostly poorly understood. Nevertheless, while most studies were established on cells in culture ( in vitro), recent experiments show that similar effects are obtained on tissue ( in vivo). Transfer remains controlled by the physical parameters of the electrical treatment.

scholarly journals Ultrashort laser pulse ablation of copper, silicon and gelatin: effect of the pulse duration on the ablation thresholds and the incubation coefficients

2016 ◽  
Vol 122 (2) ◽  
Author(s):  
Chandra S. R. Nathala ◽  
Ali Ajami ◽  
Wolfgang Husinsky ◽  
Bilal Farooq ◽  
Sergey I. Kudryashov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Duration ◽  
Ultrashort Laser Pulse ◽  
Ultrashort Laser
Sign in / Sign up

Export Citation Format

Share Document