Journal ArticleDOI
Generation of coherent phonons in condensed media
TLDR
In this article, the generation of coherent phonons by absorption of femtosecond laser pulses through interband transitions in different materials is summarized, starting with layered III-VI semiconductors, where optical excitation is performed with amplified pulses.Abstract:
The generation of coherent phonons by absorption of femtosecond laser pulses through interband transitions in different materials is summarized. Starting with layered III-VI semiconductors, where optical excitation is performed with amplified pulses, the generation mechanism via strong interband transitions is investigated. In Ge, stimulated resonant Raman scattering is found to be the decisive driving force. In GaAs, however, the ultrafast screening of surface space charge fields launches LO-phonons via electrostatic coupling. In the metallic state of high-temperature superconductors, the generation of highly symmetric A/sub g/ modes is assigned to displacive processes induced by a nonequilibrium electronic carrier distribution. In the superconducting state the amount of coherent displacement is strictly correlated to the number of optically broken superconducting pairs. In addition to the comparison of various generation processes, the dephasing of coherent phonons is addressed. >read more
Citations
More filters
Journal ArticleDOI
Ultrafast Electron Dynamics and Optical Nonlinearities in Metal Nanoparticles
TL;DR: In this article, the femtosecond optical response of noble metal nanoparticles and its connection to the ultrafast electron dynamics are discussed in light of the results of high-sensitivity femtocond pump−probe experiments.
Journal ArticleDOI
Generating coherent THz phonons with light pulses
TL;DR: In this paper, the authors present an overview of femtosecond-pulse generation of coherent optical phonons, focusing on Raman mechanisms for the coherent driving force providing a comprehensive approach for the description of both below-gap and resonant excitation.
Journal ArticleDOI
Properties of gallium selenide single crystal
TL;DR: In this article, a search of the published literature amassed over 630 articles and an attempt was made to organize this material by growth, structural and mechanical, thermal, electrical and optical properties.
Journal ArticleDOI
Electro-optic detection of subwavelength terahertz spot sizes in the near field of a metal tip
TL;DR: In this paper, a sharp copper tip is used to locally distort and concentrate the THz electric field, which is electro-optically measured in an (100) oriented GaP crystal.
Book ChapterDOI
Coherent phonons in condensed media
TL;DR: In this article, the authors present an overview of recent achievements in the field of condensedmatter physics, including the detection of coherent phonons and phonon-polaritons with femtosecond time resolution.
References
More filters
Book
Introduction To Superconductivity
TL;DR: In this article, a revised version of the book has been published to incorporate the many new developments in superconductivity, including new topics on high temperature superconductors and nonequilibrium superconductivities.
Book
The Principles of Nonlinear Optics
TL;DR: In this article, the authors present a general description of wave propagation in nonlinear media, including high-resolution nonlinear optical spectroscopy, and four-wave mixing and mixing.
Journal ArticleDOI
Vibrational dynamics of liquids and solids investigated by picosecond light pulses
A. Laubereau,W. Kaiser +1 more
TL;DR: In this article, a detailed theoretical treatment of different excitation and probing processes are outlined and a variety of results are presented and discussed, including the population lifetime of known vibrational modes and evidence for inter-and intra-molecular interactions.
Journal ArticleDOI
Anharmonic Decay of Optical Phonons
TL;DR: In this article, an expression for the lifetime of an optical phonon decaying into two acoustical phonons, and its temperature dependence, was derived from perturbation theory, and the strength of the interaction was expressed in terms of the Gruneisen constant and the effect of a strain, equivalent to the instantaneous strain of a optical mode on the frequency spectrum of a linear chain with alternating force constants.