Title :
Liquid micro-vortex generated around laser focal point in an intense high-frequency electric field
Author :
Mizuno, Akin ; Nishioka, Masateru ; Ohno, Yuji ; Dascelescu, L.
Author_Institution :
Toyohashi Univ. of Technol., Toyohashi, Japan
Abstract :
A micro-vortex was observed to occur in liquid films exposed to the combined action of a focused laser beam and a high-frequency electric field. The laser beam was perpendicular to both the surface of the liquid film and the direction of the electric field. The size of this optoelectrostatical microvortex (OEMV) in various liquids (water, ethanol, acetone, nitrobenzene) varied with the conditions of the experiment, but stayed in the 10 μm range. The velocity of the liquid flow in the vortex could be controlled according to the intensity and frequency of the electric field (5×104 to 106 V/m, 2×104 to 106 Hz), laser power (0 to 2 W), and laser power density in the focal point. No microvortex was observed in benzene and chloroform. As an application of this phenomenon, single DNA molecules could be transported along the OEMV
Keywords :
electric fields; electrostatics; laser beam effects; vortices; 0 to 2 W; 2×104 to 1×106 Hz; HF; acetone; benzene; chloroform; ethanol; high-frequency electric field; laser focal point; laser power density; liquid films; micro-vortex; nitrobenzene; optoelectrostatical microvortex; single DNA molecules; size; water; DNA; Ethanol; Fluid flow; Frequency; Laser beams; Liquids; Optical control; Power lasers; Surface emitting lasers; Velocity control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-1462-X
DOI :
10.1109/IAS.1993.299084
