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

Result code in 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>
Result on the web
<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>

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<sub>imp</sub> - 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
<a href="/en/project/GA13-12386S" target="_blank" >GA13-12386S: Photoconductivity and dynamics of excitations in nanostructured and disordered semiconductors on ultrafast time scale</a><br>
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

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