Title :
Nanoparticle-sensor based on optical gradient force
Author :
Ignatovich, F. ; Hartschuh, A. ; Novotny, L.
Author_Institution :
Inst. of Opt., Rochester Univ., NY, USA
Abstract :
We present a detection scheme for nanoscale particles based on the optical gradient force and torque near a tightly focused laser beam. The focus affects the path of nanoparticles passing by and a quadrant detector records the particle trajectory. A feedback system continuously adjusts the laser power thereby preventing the particles from being trapped. Particle size and shape can be assessed by evaluating the time-trace of the quadrant detector signal.
Keywords :
laser beam effects; optical focusing; optical sensors; radiation pressure; feedback system; focused laser beam; nanoparticle-sensor; optical gradient force; particle shape; particle size; particle trajectory; quadrant detector; torque; Detectors; Laser beams; Laser feedback; Nanoparticles; Optical feedback; Optical recording; Particle beams; Power lasers; Shape; Torque;
Conference_Titel :
Quantum Electronics and Laser Science, 2003. QELS. Postconference Digest
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-749-0
DOI :
10.1109/QELS.2003.238434
