Tight focusing of laser light using a chromium Fresnel zone plate.
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DOI: 10.1364/oe.25.019662
Abstract: Using near-field scanning microscopy, we demonstrate that a 15-µm zone plate fabricated in a 70-nm chromium film sputtered on a glass substrate and having a focal length and outermost zone's width equal to the incident… read more here.
Keywords: zone; subwavelength focal; focusing laser; zone plate ... See more keywords