THz Radiation from Subwavelength Volumes on Water Surfaces and in Air: Effects of Mass Density Gradients and External Magnetic Fields

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2FCZ______%3A_____%2F24%3AN0000064" target="_blank" >RIV/CZ______:_____/24:N0000064 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.webofscience.com/wos/woscc/full-record/WOS:001296622700001" target="_blank" >https://www.webofscience.com/wos/woscc/full-record/WOS:001296622700001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.4c01268" target="_blank" >10.1021/acs.jpcc.4c01268</a>

Jazyk výsledku

angličtina

Název v původním jazyce

THz Radiation from Subwavelength Volumes on Water Surfaces and in Air: Effects of Mass Density Gradients and External Magnetic Fields

Popis výsledku v původním jazyce

High-intensity ∼10 PW/cm2 laser pulses with a 35 fs pulse duration are tightly focused into ∼ 8 μm in diameter focal spots to induce ionization and dielectric breakdown of 1) water microfilms and 2) air in the focal region and generate X-ray and THz waves. At the used focusing, there was no filamentation, and energy deposition took place within the geometrical confinement of the focal volume in air and on the water surface in the case of water films, and we explored very different mass-density conditions of medium for THz generation. The shockwaveinduced mass-density gradients in air and at the front side of the water surface enhanced the X-ray and THz radiation when a prepulse (one or two) was time and space synchronized with the main pulse. At the optimized separation in space and the corresponding timing of the main pulse, X-ray and THz emissions were observed to be orders of magnitude stronger. Visualization of the main pulse interaction with the prepulse-triggered shockwave front was optically resolved and its handedness was measured in transmission and reflection from water targets. The mechanisms of X-ray and THz radiation are explained, and the effect of an externally applied magnetic field in different orientations is tested. It was observed that magnetic fields up to 0.6 T had only a minor effect on current transients, which were responsible for THz emission from the water microfilm target.

Název v anglickém jazyce

THz Radiation from Subwavelength Volumes on Water Surfaces and in Air: Effects of Mass Density Gradients and External Magnetic Fields

Popis výsledku anglicky

High-intensity ∼10 PW/cm2 laser pulses with a 35 fs pulse duration are tightly focused into ∼ 8 μm in diameter focal spots to induce ionization and dielectric breakdown of 1) water microfilms and 2) air in the focal region and generate X-ray and THz waves. At the used focusing, there was no filamentation, and energy deposition took place within the geometrical confinement of the focal volume in air and on the water surface in the case of water films, and we explored very different mass-density conditions of medium for THz generation. The shockwaveinduced mass-density gradients in air and at the front side of the water surface enhanced the X-ray and THz radiation when a prepulse (one or two) was time and space synchronized with the main pulse. At the optimized separation in space and the corresponding timing of the main pulse, X-ray and THz emissions were observed to be orders of magnitude stronger. Visualization of the main pulse interaction with the prepulse-triggered shockwave front was optically resolved and its handedness was measured in transmission and reflection from water targets. The mechanisms of X-ray and THz radiation are explained, and the effect of an externally applied magnetic field in different orientations is tested. It was observed that magnetic fields up to 0.6 T had only a minor effect on current transients, which were responsible for THz emission from the water microfilm target.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

The Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

1932-7455

Svazek periodika

128

Číslo periodika v rámci svazku

35

Stát vydavatele periodika

AU - Austrálie

Počet stran výsledku

7

Strana od-do

14776-14783

Kód UT WoS článku

001296622700001

EID výsledku v databázi Scopus

2-s2.0-85202058627