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Photon Tunneling Microscope Reveals Singularities

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A team at the University of Twente in Enschede, the Netherlands, has developed a technique that may aid the design and analysis of photonic structures. Reporting in the July 10 issue of Physical Review Letters, the researchers describe how they used a heterodyne interferometric photon scanning tunneling microscope to observe the phase singularities in an optical waveguide predicted by theory. The researchers split a laser beam into two components: a reference and a beam that they injected into the 4-nm-high, 3-µm-wide Si3N4 channel. They scanned a fiber in a raster pattern 20 nm...Read full article

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