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Showing 1 to 20 of 35 for “"surface acoustic waves"”.
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Fermionic Quantum Information in Surface Acoustic Waves
… of the control of single electrons in a surface-acoustic-wave-based quantum circuit. However, work in this field is far from over. I present various research paths for future projects. These include going beyond the time-dependent Schrödinger equation to capture more complicated dynamics, …
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Steady-state nonlinear interactions of surface acoustic waves.
Thesis. 1977. Elec.E.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Imaging surface acoustic waves in anisotropic and periodic media
A new technique has been developed for studying surface acoustic wave propagation. The technique, which uses non-contact immersion transducers to excite and detect ultrasound with frequencies between 1 and 20 MHz, allows convenient examination of surface waves traveling in arbitrary directions on a …
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Flexible Strain Detection Using Surface Acoustic Waves: Fabrication and Tests
… health monitoring applications. Among them, a Surface Acoustic Wave sensor (SAW) offers an overwhelming advantage over other commercial sensing technologies due to its passive, small size, fast response time, cost-effectiveness, and wireless capabilities. Development of SAW sensors allows …
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Photoexcited hypersonic surface acoustic waves propagating under periodic metal grating
… is an attractive way of producing coherent surface acoustic waves (SAW). Ultrafast laser pulses incident on this structure produce constrasting thermal strain in the grating and the substrate thus launching surface acoustic waves. The frequency of the SAW is inversely dependant on the period …
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Reducing extrinsic damping of surface acoustic waves at gigahertz frequencies
High-frequency surface acoustic waves (SAWs) in the GHz range can be generated using absorption from an ultrafast laser in a patterned metallic grating on a substrate. Reducing the attenuation at these frequencies can yield better sensors as well as enable them to better probe phonon and …
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Design and fabrication of granular materials for surface acoustic waves
… to novel propagation behaviors of mechanical waves. Acoustic studies of granular media typically involve macroscopic particles whereas contact-based vibrations of microparticles remain largely unexplored. The adhesion which can be neglected on millimeter scale is significant on micron scales …
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Mechanical characterisation of soft biological tissue by using surface acoustic waves
… diagnosis or disease progression tracking. Surface acoustic waves (SAWs) have been preliminarily used for the characterisation of tissue mechanical properties and it is increasingly becoming a topic of research interest as SAWs can provide more localised information in the tissue …
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A dual differential interferometer for measurements of broadband surface acoustic waves
… direction of propagation of broadband ultrasonic surface waves is described. Each pair of focused laser probe beams is used in a separate wideband differential interferometer to independently detect the component of surface wave motion along one direction of the surface. By combining the two …
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Low-dimensional electron transport and surface acoustic waves in GaAs and ZnO heterostructures
A surface acoustic wave (SAW) is a combination of a mechanical wave and a potential wave propagating on the surface of a piezoelectric substrate at the speed of sound. Such waves are widely applied in not only the communication industry, but also in quantum physics research, such as …
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Exploring the Effect of Irradiation Time on the Damping of Surface Acoustic Waves
… qualities of the signal. In particular, the acoustic damping parameter is scrutinized in relation to the irradiation time of the samples from Byron Nuclear Generating Station. The trend was found to be similar to that of other material properties when compared with irradiation time, denoting …
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Surface Acoustic Waves Propagation and Coupling Fields in Piezomagnetic and Piezoelectric Semiconductor Layered Structures
… research on multi-field coupling behaviors and waves modulation of PSs has become one of the hot topics. By integrating multiferroic materials with PSs, new magnetically regulated composite devices such as magnetically induced piezoelectric potential transistors, magnetically driven …
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Low Temperature Electron Irradiation Induced Defects in Gallium-Arsenide: Bulk and Surface Acoustic Wave Studies
… in n-type and semi-insulating GaAs with bulk and surface acoustic waves (SAW) respectively. Bulk waves at eight frequencies between 9 and 130 MHz and SAW at 73 and 145 MHz were used. The reorientation kinetics of both peaks follow the Arrhenius law.
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Enhanced condensation with active methods
Condensation of low surface tension fluids is important in liquefied natural gas processing and refrigeration systems. Current state of the art low surface energy low hysteresis coatings are not able to achieve dropwise condensation below 10 mN/m. Surface acoustic waves are proposed as an active …
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Harmonic Acoustics for Single Cell Manipulation
… testing results. On the other hand, conventional acoustic tweezers can manipulate cells in a high biocompatible and contact-free manner but lack the precision to selectively manipulate single cells for biophysical studies. In this dissertation, I demonstrate the reinvention of the acoustic …
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Weak Shock Waves on a Chip: Generation and Applications
… laser-shock experiments in solid media, shock waves are typically excited from the ablation of a photoacoustic transducer layer deposited onto the sample of interest. Unavoidably, the target materials are damaged. This leads to the necessity of changing targets after each exposure, likely …
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Optical fiber detection of ultrasonic vibration and acoustic emission
… the study is to develop a sensor for detecting acoustic emissions (AE) inside composite structures. The basics of wave propagation inside of materials has been presented along with an overview of typical acoustic emission testing. Surface acoustic waves (SAWs) were studied first and a novel, …
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Study of waveguide and anisotropy effects upon surface acoustic wave velocities in thin films
… based on laser excitation and detection of surface acoustic waves (SAWs) for mechanical properties of thin metal films in the microelectronic industry. In this work, the effect of elastic anisotropy from silicon wafers on ISTS measurements has been studied. It has been shown that for films …
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