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(a) Schematic of an optical setup for commercially available confocal microscopy. L, lens; PD, photodetector; DM dichroic mirror; OL, objective lens; F, bandpass filter; AS, aperture stop; FS, field stop; BFIM, bright field imaging module. (b) Photo of a confocal microscope. The area surrounded by the red dashed line indicates BFIM.
