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Living Reference Work Entry In depth
Surface Brillouin Scattering
This chapter provides a broad introductory overview of surface Brillouin scattering, a noncontact optical technique for probing the surface dynamics of solids, and thereby obtaining information about their nea...
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Article
A model for terahertz plasmons in graphene
We derive and analyze a 2D model for plasmons, in order to understand the general preconditions for the appearance of THz plasmons in low-dimensional nanosystems like graphene. Using experimental data and back...
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Chapter and Conference Paper
Guided Elastic Waves at Periodically Structured Surfaces and Interfaces
A brief overview is provided of guided elastic waves at periodically structured surfaces, with particular attention given to their folded dispersion relations,the occurrence of band gaps, their coupling to bul...
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Chapter
Acoustic Microscopy Wall Thickness Measurements on Nickel Based Superalloy Gas Turbine Blades
In the manufacture of hollow jet engine turbine blades, monitoring the wall thickness is an important component of quality control. Because of the inaccessibility of the inner air channel to mechanical probing...
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Chapter
Brillouin Scattering as a Tool for Characterizing Surfaces, Interfaces and Thin Films
In the past decade, considerable progress has been made in the development of Brillouin scattering (BS) as a technique for the nondestructive characterization of materials. With the advent of high resolution a...
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Chapter
Phonon Imaging at Ultrasonic Frequencies: The Dynamic Response on Anisotropic Solids
Recently there have been a number of ultrasonics experiments performed that elicit detailed information on the elastodynamic response of anisotropic solids to transient point-like forces. In this lecture I wil...
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Chapter
Thermal Phonon Imaging
The development of phonon imaging by Northrop and Wolfe (1979,1980) arose from efforts to understand the dynamics of electron-hole droplets in semiconductors (Hensel and Dynes, 1979) and intensity measurements...
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Chapter and Conference Paper
Geometrical Dispersion of Ballistic Heat Pulses: Application to Paratellurite
Geometrical dispersion of ballistic phonon transit times arises partly from the spread in path lengths of individual phonon trajectories linking different points of the source and detector and partly from the ...
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Chapter and Conference Paper
Anisotropy Imaging of Materials
We describe in this paper an imaging technique in which a pulsed laser, operating as an ultrasonic point-source, is scanned across the surface of a specimen and the generated elastic waves are detected by a point...
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Chapter
Phonon Imaging in Single and Multilayered Anisotropic Solids
Recent developments in phonon imaging have increased its value as a tool for studying phonon reflection and transmission at surfaces and have extended its range into the ultrasonic frequency domain. In the pro...
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Article
Geometrical factors in the dispersion of ballistic heat pulses
The dispersion of ballistic heat pulses in dielectric crystals can partly be ascribed to geometrical factors that include the sample thickness, the contact areas of the source and detector and their relative p...
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Chapter
Materials Characterization from Elastic Wave Anisotropy Images
We describe in this paper the use of transient ultrasonic waves to image wave anisotropy effects in single crystal specimens of silicon. The measurements rely on the point-source/point-receiver (PS/PR) technique ...
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Chapter
Determination of Elastic Constants of Anisotropic Solids from Group Velocity Data
Most determinations of elastic constants of anisotropic solids are based on acoustic wave phase velocity measurements [1,2]. The methods for recovering elastic constants from phase velocity data are fairly str...
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Chapter
Phonon Images and Phonon Conduction in Trigonal Crystals
Monte Carlo phonon-focusing patterns provide graphic illustration of the striking changes in phonon intensity arising from elastic anisotropy and piezoelectric coupling. Patterns for each of the three modes sh...
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Chapter and Conference Paper
Extraordinary Caustics in the Phonon Focusing Patterns of Crystals
Catastrophe theory provides a convenient framework for classifying the phonon focusing caustics of crystals [1–4]. There are however many prominent focusing singularities which, because they arise in the vicin...
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Chapter and Conference Paper
A Model for Calculating Pseudosurface Wave Structures in Phonon Imaging
The intensity variation in phonon images derives principally from two sources: phonon focusing in the bulk of the crystal, and the directional emissivity of the surfaces across which the phonons enter and leav...
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Chapter and Conference Paper
Critical-Cone Channeling of Thermal Phonons from Solid/Solid Interfaces
Phonon imaging provides a powerful means of studying the anisotropy of ballistic phonon flux in crystals at low temperatures [1]. In the typical phonon-imaging experiment a point source of heat (focused laser ...
