Enhanced photoemission from laser-excited plasmonic nano-objects in periodic arrays

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17110%2F16%3AA210288Q" target="_blank" >RIV/61988987:17110/16:A210288Q - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/16:00470447 RIV/68407700:21340/16:00300208

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/0953-8984/28/31/315301/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/0953-8984/28/31/315301/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0953-8984/28/31/315301" target="_blank" >10.1088/0953-8984/28/31/315301</a>

Result language

angličtina

Original language name

Enhanced photoemission from laser-excited plasmonic nano-objects in periodic arrays

Original language description

The process of photoelectron emission from gold surfaces covered with nano-objects that are organized in the form of a periodic array is addressed in the short laser pulse regime (<= 50 fs) at moderate intensities similar to 10(10) W cm(-2) and for various laser wavelengths. The emission spectrum from a gold single crystal measured under the same conditions is used for reference. The comparison of the photo-emission yield and the energy of the ejected electrons with their counterparts from the (more simple) reference system shows that the periodic conditions imposed on the target surface drastically enhance both quantities. In addition to the standard mechanism of Coulomb explosion, a second mechanism comes into play, driven by surface plasmon excitation. This can be clearly demonstrated by varying the laser wavelength. This interpretation of the experimental data is supported by predictions from model calculations that account both for the primary quantum electron emission and for the subsequent surface-plasmon- driven acceleration in the vacuum. Despite the fact that the incident laser intensity is as low as similar to 5 x 10(10) W cm(-2), such a structured target permits generating electrons with energies as high as 300 eV. Experiments with two incident laser beams of different wavelengths with an adjustable delay, have also been carried out. The results show that there exist various channels for the decay of the photo-emission signal, depending on the target type. These observations are shedding light on the various relaxation mechanisms that take place on different timescales.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

30500 - Other medical sciences

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

J PHYS-CONDENS MAT

ISSN

0953-8984

e-ISSN

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Volume of the periodical

28

Issue of the periodical within the volume

31

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

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UT code for WoS article

000378325200004

EID of the result in the Scopus database

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