Experimental observation of anharmonic effects in coherent phonon dynamics in diamond

We present a study of coherent optical phonon dynamics in monocrystalline and polycrystalline diamond using transient transmission spectroscopy with few-cycle laser pulses. Besides the oscillations at the fundamental phonon frequency of 40 THz we observe a signal at second harmonic frequency and fou...

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Bibliographic Details
Published in:Diamond and related materials 2018-11, Vol.90, p.202-206
Main Authors: Zukerstein, M., Kozák, M., Trojánek, F., Malý, P.
Format: Article
Language:English
Subjects:
Anharmonic effects
Anharmonicity
Dependence
Diamonds
Few-cycle laser pulses
Lasers
Optical properties
Phonons
Polycrystalline diamond
Polycrystals
Sidebands
Single crystal diamond
Single crystals
Spectrum analysis
Ultrafast spectroscopy
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Summary:We present a study of coherent optical phonon dynamics in monocrystalline and polycrystalline diamond using transient transmission spectroscopy with few-cycle laser pulses. Besides the oscillations at the fundamental phonon frequency of 40 THz we observe a signal at second harmonic frequency and four weak frequency sidebands (25.0 THz, 32.5 THz, 47.5 THz and 55.0 THz). Potential origin of these sidebands is discussed along with the dependence of the observed signal on experimental conditions (pump power, sample thickness, etc.). Phonon dephasing time in polycrystalline diamond T2,poly = 6.0 ± 0.4 ps is found to be shorter than in monocrystalline diamond T2,mono = 7.0 ± 0.4 ps. [Display omitted] •Frequency sidebands in coherent lattice vibrations in diamond.•Transient transmission signal at second harmonic of phonon frequency.•Phonon dephasing time varies with the diamond crystallinity.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2018.10.018