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

Result code in IS VaVaI

RIV/00216208:11320/17:10366559 - isvavai.cz

Result on the web

http://dx.doi.org/10.1016/j.diamond.2016.11.008

DOI - Digital Object Identifier

10.1016/j.diamond.2016.11.008

Result language

angličtina

Original language name

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

Original language description

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.

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

10306 - Optics (including laser optics and quantum optics)

Project

GA13-12386S: Photoconductivity and dynamics of excitations in nanostructured and disordered semiconductors on ultrafast time scale

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Diamond and Related Materials

ISSN

0925-9635

e-ISSN

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Volume of the periodical

71

Issue of the periodical within the volume

14 November 2016

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

7

Pages from-to

13-19

UT code for WoS article

000392774300002

EID of the result in the Scopus database

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