A laser beam is shone onto a variable rectangular aperture. The size of the hole determines the type of diffraction produces on the screen. Very small apertures produce Fraunhofer diffraction, and ...

Plug in the laser and aim it at the aperture, make necessary adjustments such that the intended diffraction pattern is visible. The aperture should be very close to the laser to maximize the incident ...

Captured here is a laser diffraction pattern, visible as a series of concentric circles with a bright central area. This pattern is a result of light waves spreading out and overlapping after passing ...

where a small aperture or sharp tip scans across the sample surface at a nanometric distance. Unlike traditional optical microscopy, SNOM bypasses the diffraction limit by exploiting the near-field, ...