Three-dimensional tracking of small spheres in focused laser beams: influence of the detection angular aperture.

@article{Rohrbach2003ThreedimensionalTO,
  title={Three-dimensional tracking of small spheres in focused laser beams: influence of the detection angular aperture.},
  author={Alexander Rohrbach and Holger Kress and Ernst H. K. Stelzer},
  journal={Optics letters},
  year={2003},
  volume={28 6},
  pages={411-3}
}
Back-focal-plane interferometry is a method capable of determining the three-dimensional position of a particle with high precision (< 3 nm) at high sampling rates (1 MHz). We investigated theoretically the performance of such a system for dielectric spheres with diameters D = 0.53-3 microm and for metallic spheres with D < or = 300 nm. Good sensitivity and linearity were achieved for a detection angular aperture sin(alpha) of no more than 0.5. A value of sin(alpha) > 0.7 should be used only… CONTINUE READING
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