Results 151 to 160 of about 1,812 (181)

Phonon attenuation in amorphous solids studied by picosecond ultrasonics

Physical Review B, 1996
We have used a picosecond optical technique to measure the attenuation {alpha} of longitudinal-acoustic phonons in several disordered solids. We find a universal {alpha}{approximately}{nu}{sup 2} behavior for frequencies {nu} up to 320 GHz and for temperatures between 80 and 300 K.
, Morath, , Maris
openaire   +2 more sources

Imaging Nanostructures with Picosecond Ultrasonic Pulses

2005
We describe a novel imaging technique that employs coherent acoustic phonon pulses which are generated and detected by ultrafast optical methods. Sub-micron resolution images of Al patterns lithographically etched on a Si substrate are shown.
Brian C. Daly, Niels C.R. Holme, Takashi Buma, Cyril Branciard, Theodore B. Norris, S. Pau, D.M. Tennant, J.A. Taylor, J.E. Bower   +8 more
openaire   +1 more source

A study of the vibrational modes of a nanostructure with picosecond ultrasonics

Physica B: Condensed Matter, 2002
Abstract We describe experiments in which a sub-picosecond pump light pulse is used to excite vibrations in a nanostructure. The sample consists of a periodic array of copper wires embedded in a glass matrix on a silicon substrate. The motion of the wires after excitation is detected using a time-delayed probe light pulse.
G.Andrew Antonelli, Humphrey J. Maris, Sandra G. Malhotra, James M.E. Harper   +3 more
openaire   +1 more source

Phonons rectification in picosecond laser ultrasonics

The Journal of the Acoustical Society of America, 2008
In standard ultrafast acoustic experiments very short coherent acoustic pulses are generated by the absorption of a femtosecond laser pulse in a thin metallic transducer deposited on the sample. Subsequently the acoustic pulses and the heat generated in the transducer cross the sample and are partially transmitted in the underlaying substrate.
Bernard Perrin, Shuo Zhang, Laurent Belliard, Emmanuel Péronne   +3 more
openaire   +1 more source

Picosecond ultrasonic measurement of the velocity of phonons in water

physica status solidi (b), 2005
AbstractWe report measurements of the sound velocity as a function of temperature in water using the picosecond acoustic interferometry technique. We show that this method can be used to make velocity measurements on very small sample volumes. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
L. J. Shelton, F. Yang, W. K. Ford, H. J. Maris   +3 more
openaire   +1 more source

Picosecond ultrasonics study of the vibrational modes of a nanostructure

Journal of Applied Physics, 2002
We report experiments in which a subpicosecond pump light pulse is used to excite vibrations in a nanostructure consisting of a periodic array of copper wires embedded in a glass matrix on a silicon substrate. The motion of the wires after excitation is detected using a time-delayed probe light pulse. From the measured data, it is possible to determine
G. Andrew Antonelli, Humphrey J. Maris, Sandra G. Malhotra, James M. E. Harper   +3 more
openaire   +1 more source

Picosecond laser ultrasonics

2022
Osamu Matsuda, Oliver B Wright
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Picosecond ultrasonics

IEEE Journal of Quantum Electronics, 1989
H.T. Grahn, H.J. Maris, J. Tauc
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Picosecond ultrasonics for cell imaging and characterisation

Photons Plus Ultrasound: Imaging and Sensing 2022, 2022
Fernando Perez-Cota, Rafael Fuentes-Dominguez, Salvatore La Cavera, William Hardiman, Mengting Yao, Richard J. Smith, Matt Clark   +6 more
openaire   +1 more source

Picosecond holographic grating generation of ultrasonic waves

IEEE Journal of Quantum Electronics, 1986
The picosecond holographic grating generation and detection of ultrasonic waves are described. Two mechanisms, a heating mechanism and a stimulated Brillouin scattering mechanism, are described. These permit the generation of tunable ultrasonic waves in the MHz to GHz range.
openaire   +1 more source