Bragg Mirror Reflectance in a VCSEL Scanning Optical Microscope
It has been proposed that near-field scanning optical microscopy might be performed using a vertical cavity surface emitting laser (VCSEL) both as source and detector. The required high-resolution probing field could be obtained by covering the emitting Bragg stack with a high reflectivity metal film containing a small sub-micron diameter aperture, on axis. The change in complex reflectance from the Bragg stack for an object placed in the near field of the aperture might be expected to modulate the wavelength, or power output, from the VCSEL. This would provide the necessary contrast as the object is scanned past the aperture.
KeywordsAperture Width Complex Reflectance Vertical Cavity Surface Emit Laser Metal Screen Bragg Mirror
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