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We demonstrate a novel detection scheme for the orbital angular momentum(OAM) of light using circular plasmonic lens. Owing to a division-of-amplitudeinterference phenomenon between the surface plasmon waves and directlytransmitted light, specific intensity distributions are formed near theplasmonic lens surface under different OAM excitations. Due to different phasebehaviors of the evanescent surface plasmon wave and the direct transmission,interference patterns rotate as the observation plane moves away from the lenssurface. The rotation direction is a direct measure of the sign of OAM, whilethe amount of rotation is linked to the absolute value of the OAM. This OAMdetection scheme is validated experimentally and numerically. Analyticalexpressions are derived to provide insights and explanations of this detectionscheme. This work forms the basis for the realization of a compact andintegrated OAM detection architect that may significantly benefit opticalinformation processing with OAM states.

Detecting orbital angular momentum through division-of-amplitude interference with a circular plasmonic lens