AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Opto-Aerodynamic Manipulating and Focusing of Aerosol Particles
YONG-LE PAN, Aimable Kalume, Chuji Wang, Joshua Santarpia, U.S. Army Research Laboratory, Adelphi, MD.
Abstract Number: 57 Working Group: Instrumentation and Methods
Abstract We manipulate, focus, and concentrate micron-size aerosol particles using the combined drag force and optical force. The focusing, concentrating, and trapping process is carried out by using a counter-flow coaxial-dual-nozzle and a special optical configuration. Continuously sampled individual particles are concentrated, then slowed down, and eventually trapped. The special optically configured laser profile can, stably, trap both absorbing or transparent particles, make a particle rotate or vibrate along the trapping position. Working at certain conditions for such an opto-aerodynamic configuration, the micron-size airborne particles can be 6 times more concentrated/focused by using the combination of optical forces (radiative pressure force and photophoretic force) than using drag force alone. Subsequently, the aerosol stream can be focused from 250 micron diameter further down to less than 100 micron in diameter.