Nanoparticle-sensor based on optical gradient force

Nanoparticle-sensor based on optical gradient force

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 pow...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Ignatovich, F., Hartschuh, A., Novotny, L.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Detectors
Laser beams
Laser feedback
Nanoparticles
Optical feedback
Optical recording
Particle beams
Power lasers
Shape
Torque
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Beschreibung
Zusammenfassung: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.
DOI:10.1109/QELS.2003.238434