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

Kód výsledku v 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>

Nalezeny alternativní kódy

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

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

30500 - Other medical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

J PHYS-CONDENS MAT

ISSN

0953-8984

e-ISSN

—

Svazek periodika

28

Číslo periodika v rámci svazku

31

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

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Kód UT WoS článku

000378325200004

EID výsledku v databázi Scopus

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