Nonlocal flat optics

In electromagnetics and photonics, ‘nonlocality’ refers to the phenomenon by which response/output of a material or system at certain point in space depends on input field across an extended region space. Although nonlocal effects associated wavevector/momentum dependence have often been neglected seen as nuisance context metasurfaces, emerging flat optics seeks exploit strong effective nonlocality enrich enhance their response. Here we summarize latest advances this field, focusing its fundamental principles various applications, from optical computing compression. The convergence local may open exciting opportunities quest control light, real momentum space, using ultra-thin platforms. Nonlocal effects—in response given spatial surrounding space—are reviewed metasurfaces optics. be useful for controlling light