Cloaked Near-Field Scanning Optical Microscope Tip for Noninvasive Near-Field Imaging
Andrea Alu, Nader Engheta
PHYSICAL REVIEW LETTERS
Volume: 105, Issue: 26, 31 Dec. 2010
263906-1 - 263906-4
Near-field imaging is a well-established technique in biomedical measurements, since closer to the detail of interest it is possible to resolve subwavelength details otherwise unresolved by regular lenses. A near-field scanning optical microscope (NSOM) tip may indeed overcome the resolution limits of far-field optics, but its proximity inherently perturbs the measurement. Here, we apply the recent concept of a ‘‘cloaked sensor’’ to an NSOM device in collection mode, showing theoretically how a proper plasmonic cover applied to an NSOM tip may drastically improve its overall measurement apabilities.
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