globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1809725115
论文题名:
Parametric amplification of optical phonons
作者: Cartella A.; Nova T.F.; Fechner M.; Merlin R.; Cavalleri A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:48
起始页码: 12148
结束页码: 12151
语种: 英语
英文关键词: Phonon amplification ; Silicon carbide ; Ultrafast spectroscopy
Scopus关键词: Article ; density functional theory ; dielectric constant ; electromagnetic radiation ; kinetics ; microscopy ; nonlinear system ; phase transition ; phonon ; physical parameters ; polarization ; priority journal ; stimulation
英文摘要: We use coherent midinfrared optical pulses to resonantly excite large-amplitude oscillations of the Si–C stretching mode in silicon carbide. When probing the sample with a second pulse, we observe parametric optical gain at all wavelengths throughout the reststrahlen band. This effect reflects the amplification of light by phonon-mediated four-wave mixing and, by extension, of optical-phonon fluctuations. Density functional theory calculations clarify aspects of the microscopic mechanism for this phenomenon. The high-frequency dielectric permittivity and the phonon oscillator strength depend quadratically on the lattice coordinate; they oscillate at twice the frequency of the optical field and provide a parametric drive for the lattice mode. Parametric gain in phononic four-wave mixing is a generic mechanism that can be extended to all polar modes of solids, as a means to control the kinetics of phase transitions, to amplify many-body interactions or to control phonon-polariton waves. © 2018 National Academy of Sciences. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163638
Appears in Collections:气候变化与战略

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作者单位: Cartella, A., Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, 22761, Germany; Nova, T.F., Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, 22761, Germany, Hamburg Centre for Ultrafast Imaging, University of Hamburg, Hamburg, 22761, Germany; Fechner, M., Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, 22761, Germany; Merlin, R., Department of Physics, University of Michigan, Ann Arbor, MI 48109-1040, United States; Cavalleri, A., Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, 22761, Germany, Hamburg Centre for Ultrafast Imaging, University of Hamburg, Hamburg, 22761, Germany, Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU, United Kingdom

Recommended Citation:
Cartella A.,Nova T.F.,Fechner M.,et al. Parametric amplification of optical phonons[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(48)
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