Spin-decoupled metasurface for simultaneous detection of spin and orbital angular momenta via momentum transformation.

ABSTRACT: With inherent orthogonality, both the spin angular momentum (SAM) and orbital angular momentum (OAM) of photons have been utilized to expand the dimensions of quantum information, optical communications, and information processing, wherein simultaneous detection of SAMs and OAMs with a single element and a single-shot measurement is highly anticipated. Here, a single azimuthal-quadratic phase metasurface-based photonic momentum transformation (PMT) is illustrated and utilized for vortex recognition. Since different vortices are converted into focusing patterns with distinct azimuthal coordinates on a transverse plane through PMT, OAMs within a large mode space can be determined through a single-shot measurement. Moreover, spin-controlled dual-functional PMTs are proposed for simultaneous S

SUBMITTER: Guo Y 

PROVIDER: S-EPMC7994415 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature