Title :
Ultrasonic experiments at ultra-high frequency with picosecond time-resolution
Author :
Lin, H.N. ; Stoner, R.J. ; Maris, H.J.
Author_Institution :
Dept. of Phys., Brown Univ., Providence, RI, USA
Abstract :
A method that can be used to make ultrasonic measurements with picosecond time resolution is described. In this method, short light pulses (duration ⩽1 ps) are used to generate and detect ultrasonic waves. The excellent time resolution makes possible pulse-echo ultrasonic measurements in situations in which the acoustic path length is extremely short. It is possible to make ultrasonic pulse-echo measurements on thin-film microstructures of thicknesses down to a few hundred angstroms. As examples of the use of the method, measurements of sound propagation in glass films at frequencies up to 500 GHz, studies of the mechanical properties of microstructures, and investigations of high-frequency surface waves are described
Keywords :
surface acoustic waves; thin films; ultrasonic measurement; ultrasonic velocity measurement; 10 to 500 GHz; UHF; US attenuation; US velocity; acoustic path length; glass films; high-frequency surface waves; mechanical properties; picosecond time resolution; picosecond time-resolution; pulse-echo ultrasonic measurements; short light pulses; sound propagation; thin films; thin-film microstructures; ultra-high frequency; ultrasonic measurements; ultrasonic waves; Acoustic measurements; Acoustic pulses; Acoustic signal detection; Frequency; Microstructure; Pulse generation; Pulse measurements; Time measurement; UHF measurements; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171573
