Journal ArticleDOI
High-resolution imaging of a single circular surface acoustic wave source: Effects of crystal anisotropy
Thorsten Hesjedal,G. Behme +1 more
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TLDR
In this article, a scanning acoustic force microscope (SAFM) was used to image the point-source wave field, containing the angular dependence of the phase velocity of these modes, as well as their electromagnetic coupling strength.Abstract:
We present an experimental method for the high-resolution imaging of the excitation and propagation of surface acoustic waves (SAWs) on anisotropic piezoelectric substrates. By employing a scanning acoustic force microscope (SAFM), we are able to image acoustic waves that are excitable by a single circular electrode pair source through the mixing with well-defined reference plane waves. We show amplitude and phase images of the point-source wave field, containing the angular dependence of the phase velocity of these modes, as well as their electromechanical coupling strength. The SAFM allows easy access to acoustic material properties, which are important for the design of commercial SAW devices.read more
Citations
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Modulation of photonic structures by surface acoustic waves
TL;DR: In this paper, the interaction between coherently stimulated acoustic phonons in the form of surface acoustic waves with light beams in semiconductor based photonic structures is reviewed and a detailed review of the physical and technological aspects related to control of the propagation and spatial distribution of the acoustic fields are discussed.
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Focusing of surface-acoustic-wave fields on (100) GaAs surfaces
TL;DR: In this article, the focusing of SAWs by interdigital transducers (IDTs) deposited on (100)-oriented GaAs substrates was investigated, and it was shown that the focusing performance can be considerably improved by appropriate choice of the IDT metal pads, which, under appropriate conditions, create an acoustic waveguide within the IDTs.
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Surface acoustic wave-assisted scanning probe microscopy?a summary
TL;DR: In this paper, a review of the capabilities and limitations of surface acoustic wave (SAW) based scanning probe microscopy techniques is presented, focusing on surface acoustic waves and their interaction with elastic inhomogeneities.
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Visualization of Surface-acoustic-wave Potential by Transmission-mode Microwave Impedance Microscopy
TL;DR: In this paper, the authors report the visualization of surface acoustic waves (SAWs) on ferroelectric samples by transmissionmode microwave impedance microscopy (T-MIM) and show that the SAW potential launched by the interdigital transducer is detected by the tip and demodulated by the microwave electronics as timeindependent spatial patterns.
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Imaging Acoustic Waves by Microwave Microscopy: Microwave Impedance Microscopy for Visualizing Gigahertz Acoustic Waves
TL;DR: In the frequency ( f ) regime of interest for microwave engineers, there exist three (one longitudinal, two shear) branches of vibrational modes with long wavelengths as mentioned in this paper, and the ratio between the two is typically several kilometers per second.
References
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Book
Acoustic Fields and Waves in Solids
TL;DR: In this article, the authors apply the material developed in the Volume One to various boundary value problems (reflection and refraction at plane surfaces, composite media, waveguides and resonators).
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Acoustic microscopy by atomic force microscopy
Ute Rabe,Walter Arnold +1 more
TL;DR: In this article, an atomic force microscope was constructed enabling one to image the topography of a sample, and to monitor simultaneously ultrasonic surface vibrations in the MHz range, where a part of the position sensing light beam reflected from the cantilever is directed to an external knife-edge detector.
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Scanning local‐acceleration microscopy
TL;DR: By adapting a scanning force microscope to operate at frequencies above the highest tip-sample resonance, the sensitivity of the microscope to materials' properties is greatly enhanced as mentioned in this paper, and the cantilever's behavior in response to high-frequency excitation from a transducer underneath the sample is fundamentally different than to its low-frequency response.
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Determination of the elastic constants of anisotropic materials using laser‐generated ultrasonic signals
TL;DR: In this paper, the elastic constants of an anisotropic material are determined from ultrasonic measurements made in non-principal directions of a specimen using a pulsed laser as a source and a miniature, point-like transducer as a receiver.