Abstract
Optical near-fields are interesting from a theoretical perspective and of importance for practical applications, such as high-resolution imaging, sensing, and antenna-coupled quantum light sources. In this work, we use a custom-designed superconducting nanowire single-photon detector to directly read out the near-field interaction between a source and a detector. We use a subwavelength-sized aperture at the end of an optical fiber to record spatial near-field maps and to measure the distance dependence of the optical near-field interaction. Our measurements can be well described by a superposition of evanescent source fields with no noticeable probe-sample coupling. Our approach is a first step towards the development of near-field imaging techniques with single quantum sensitivity.
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