Dynamics of photoexcited carriers in CVD diamond studied by mid-infrared femtosecond spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10366559" target="_blank" >RIV/00216208:11320/17:10366559 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.diamond.2016.11.008" target="_blank" >http://dx.doi.org/10.1016/j.diamond.2016.11.008</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.diamond.2016.11.008" target="_blank" >10.1016/j.diamond.2016.11.008</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics of photoexcited carriers in CVD diamond studied by mid-infrared femtosecond spectroscopy

Popis výsledku v původním jazyce

We report on the dynamics of high-density photoexcited charge carriers in CVD diamond at low (13 K) and moderate (250 K) temperatures studied by femtosecond pump and probe spectroscopy. We measured the transient transmission at wavelengths in the mid-infrared spectral region (3-8 mu m) to study the electron-hole liquid system around its plasma frequency. Drude theory of free carrier absorption is used to determine the parameters of the electron-hole drops. For probe wavelength of 8 pm and lattice temperature of 250 K, a fast component of the transient transmission signal with the decay time similar to 38 ps is resolved in addition to a slow similar to 1.8 ns component common to all probe wavelengths. The initial picosecond decay is ascribed to the dependence of the excited carrier absorption coefficient on the effective carrier temperature. This allows us to monitor the charge carrier relaxation after optical excitation. A quantum model of free carrier absorption including the optical and acoustic phonon scattering processes is used to support our interpretation.

Název v anglickém jazyce

Dynamics of photoexcited carriers in CVD diamond studied by mid-infrared femtosecond spectroscopy

Popis výsledku anglicky

We report on the dynamics of high-density photoexcited charge carriers in CVD diamond at low (13 K) and moderate (250 K) temperatures studied by femtosecond pump and probe spectroscopy. We measured the transient transmission at wavelengths in the mid-infrared spectral region (3-8 mu m) to study the electron-hole liquid system around its plasma frequency. Drude theory of free carrier absorption is used to determine the parameters of the electron-hole drops. For probe wavelength of 8 pm and lattice temperature of 250 K, a fast component of the transient transmission signal with the decay time similar to 38 ps is resolved in addition to a slow similar to 1.8 ns component common to all probe wavelengths. The initial picosecond decay is ascribed to the dependence of the excited carrier absorption coefficient on the effective carrier temperature. This allows us to monitor the charge carrier relaxation after optical excitation. A quantum model of free carrier absorption including the optical and acoustic phonon scattering processes is used to support our interpretation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

<a href="/cs/project/GA13-12386S" target="_blank" >GA13-12386S: Fotovodivost a dynamika excitací v nanostrukturovaných a neuspořádaných polovodičích na ultrarychlé časové škále</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Diamond and Related Materials

ISSN

0925-9635

e-ISSN

—

Svazek periodika

71

Číslo periodika v rámci svazku

14 November 2016

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

13-19

Kód UT WoS článku

000392774300002

EID výsledku v databázi Scopus

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