We describe ghost displacement in which one of a pair of correlated beam is first displaced coherently before passing through an object and then being detected. When the detector does not fire, the beam that does not interact with the object receives a nonlocal displacement at transverse spatial locations where the object is transparent. This allows an image to be formed in correlation. The method has previously been used in single mode fiber to transfer amplitude and phase information nonlocally and covertly. We introduce an experimental method for performing imaging via ghost displacement. We use a pulsed 842.2nm VCSEL to generate pseudo-thermal light via amplitude and phase modulation and obtain correlated twin beams using a beam splitter and we show the first experimental results from this system.
This paper introduces the field of metamaterials, details various optical uses of metasurfaces and demonstrates their suitability for imaging with single-photon avalanche diode (SPAD) detector arrays as an integrated optical component. A design for a metasurface-based color filter array (CFA) is presented, the fabrication methodology detailed, and a sample is integrated with a SPAD array. Examples of imaging applications using the integrated assembly are demonstrated, including passive and fluorescence imaging microscopy. The limitations of current metasurface color filtering techniques are highlighted and directions for future advances and applications discussed.
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