Projecting two-axis nanometer scale displacement of microscopic beads onto a quadrant photodetector with a laser beam

Li, Daqun; Schnapp, Bruce J.
October 1997
Review of Scientific Instruments;Oct97, Vol. 68 Issue 10, p3920
Academic Journal
Reports that a quadrant photodetector has been added onto a custom differential interference contrast microscope to measure two-axis displacement of silica beads with a noise below 150 Hz. Incorporation of a diode-pumped solid-state laser to function as an optical trap for motility studies of protein motors; Key feature for a two-axis motion detector.


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