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Optical orbital angular momentum (OAM) provides an additional dimension forphotons to carry information in high-capacity optical communication. Althoughthe practical needs have intrigued the generations of miniaturized devices tomanipulate the OAM modes in various integrated platforms, the on-chip OAMdetection is still challenging to match the newly-developed compact OAM emitterand OAM transmission fiber. Here, we demonstrate an ultra-compact device, i.e.,a single plasmonic nanohole, to efficiently measure an optical beam's OAM statein a nondestructive way. The device size is reduced down to a few hundreds ofnanometers, which can be easily fabricated and installed in the current OAMdevices. It is a flexible and robust way for in-situ OAM monitoring anddetection in optical fiber networks and long-distance optical communicationsystems. With proper optimization of the nanohole parameters, this approachcould be further extended to discriminate the OAM information multiplexed inmultiple wavelengths and polarizations.

Nondestructive on-chip detection of optical orbital angular momentum through a single plasmonic nanohole