Threading light into a nanometric hole in the shape of a "pretzel" and spiral grooves on the surface of a gold layer - an optical nanometer screw. On the right - screwing the light into the hole, on the left - electron microscope images of the nanometer optical screw.

Threading light into a nanometric hole in the shape of a "pretzel" and spiral grooves on the surface of a gold layer - an optical nanometer screw. On the right - screwing the light into the hole, on the left - electron microscope images of the nanometer optical screw.