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A Superoscillatory lens (SOL) is known to produce a sub-diffraction hotspotwhich is useful for high-resolution imaging. However, high-energy rings calledsidelobes coexist with the central hotspot. Additionally, SOLs have not yetbeen directly used to image reflective objects due to low efficiency and poorimaging properties. We propose a novel reflection confocal nanoscope whichmitigates these issues by relaying the SOL intensity pattern onto the objectand use conventional optics for detection. We experimentally demonstratesuper-resolution by imaging double bars with 330 nm separation using a 632.8 nmexcitation and a 0.95 NA objective. We also discuss the enhanced contrastproperties of the SOL nanoscope against a laser confocal microscope, and thedegradation of performance while imaging large objects.

Reflection confocal nanoscopy using a super-oscillatory lens