Quantum entanglement

Physics

Mathematics

Domain (mathematical analysis)

Signal processing

Optics

Mathematical analysis

Quantum nonlocality

Holography

Programming language

SIGNAL (programming language)

Computer science

Quantum mechanics

Digital signal processing

Computer hardware

Quantum

Physical Review Letters

Optical analog signal processing has been gaining significant attention as a way to overcome the speed and energy limitations of digital techniques. Metasurfaces offer a promising avenue towards this goal due to their efficient manipulation of optical signals over deeply subwavelength volumes. To date, metasurfaces have been proposed to transform signals in the spatial domain, e.g., for beam steering, focusing, or holography, for which angular-dependent responses, or nonlocality, are unwanted features that must be avoided or mitigated. Here, we show that the metasurface nonlocality can be engineered to enable signal manipulation in the momentum domain over an ultrathin platform. We explore nonlocal metasurfaces performing basic mathematical operations, paving the way towards fast and power-efficient ultrathin devices for edge detection and optical image processing.

Nonlocal Metasurfaces for Optical Signal Processing