Title :
Laser ultrasonic micromanipulator
Author :
Takeuchi, M. ; Murayama, R. ; Kobayashi, K. ; Kojima, T.
Author_Institution :
Dept. of Electron. Eng., Tamagawa Univ., Machida, Japan
Abstract :
Previously we have proposed ultrasonic micromanipulation (UMM) techniques for micron-sized particles in liquid based on the radiation forces of very-high-frequency (VHF) ultrasound. In this paper, we report a new laser ultrasonic micromanipulator (LUMM) in which the acoustic radiation force and optical radiation force combine complementarily as noncontact force. An experimental LUMM consists of an acoustic leaky wave transducer of center frequency 49 MHz, a laser diode with a maximum power 5 mW at 675 nm and a biological microscope. Using the LUMM, we have carried out successfully the rapid selection of a specific particle in liquid by the removal of unwanted particles from large number of 12-μm-diameter polystyrene spheres. The LUMM was also used to estimate the horizontal component of the ultrasonic radiation force based on the Stokes law from the measured critical velocity at which the trapping is released by mechanically moving particles
Keywords :
biological techniques; laser beam effects; radiation pressure; ultrasonic effects; 49 MHz; 5 mW; 675 nm; Stokes law; VHF ultrasonic irradiation; acoustic leaky wave transducer; acoustic radiation force; biological microscope; critical velocity; laser ultrasonic micromanipulator; liquid medium; noncontact force; optical radiation force; particle separation; particle trapping; polystyrene sphere; Acoustic transducers; Acoustic waves; Biomedical optical imaging; Diode lasers; Force measurement; Frequency; Micromanipulators; Microscopy; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922639
