I would like to use laser beam deflection to measure a small movement (100s nm) in a cantilever system as shown in the diagram, but I am unsure of the calculations. This may be something simple to do and I am making it more complicated in my head.
I would like to be able to calculate how the movement of the laser point on the detector/screen (PSD in the diagram) relates to the displacements I expect of the cantilever. So I can work out a rough set up and to where to place the equipment to achieve sufficient sensitivity.
Any advice or help would be appreciated, whether calculations or setup as this is not an area I am not familiar with.