Optical Tweezers

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Optical Tweezers

Resources

  • [1] Directions on how to use a QPD in an optical tweezer setup.
  • [2] Here are some slide prepping instructions from Berkeley.

Our own setup

Using NI Vision Assistant

  • [3] Image Acquisition/Saving Images
  • [4] How to track the microspheres in NI Vision Assistant using pattern matching.

Our calculations using Brownian Motion

  • 2.56 micrometer spheres
    • 4.6 mW Beam [5]

Calculating Trap Forces Using Stokes' Drag Force

  • <thead>Stoke's Drag Force Measurements</thead>
       Beam Power (mW)
    
       Escape Velocity (microns/second)
    
       Trap Force (pN)
    
           5.5
    
           20.57
    
           0.88
    
    8.5 33.49 1.44
    11.7 40.00 1.72
    15.3 62.60 2.69
    19.0 84.71 3.64
    23.0 110.77 4.76
  • []