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IR NSOM Infrared near-field scanning optical microscope images the evanescent field on a quantum cascade laser (QCL) to determine spatial distribution of modes in the laser cavity

The evanescent field at the tip is converted into a propagating wave that is collected and focused onto a detector using standard optical components. The resulting signal at the detector is proportional to the intensity of the evanescent field at the tip location on the surface.

Image Credit: Raffaele Colombelli

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