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Light carrying orbital angular momentum (OAM) has been shown to be of use ina disparate range of fields ranging from astronomy to optical trapping, and asa promising new dimension for multiplexing signals in optical communicationsand data storage. A challenge to many of these applications is a reliable anddynamic method that sorts incident OAM states without altering them. Here wereport a wavelength-independent technique capable of dynamically filteringindividual OAM states based on the resonant transmission of a tunable opticalcavity. The cavity length is piezo-controlled to facilitate dynamicreconfiguration, and the sorting process leaves both the transmitted andreflected signals in their original states for subsequent processing. As aresult, we also show that a reconfigurable sorting network can be constructedby cascading such optical resonators to handle multiple OAM statessimultaneously. This approach to sorting OAM states is amenable to integrationinto optical communication networks and has implications in quantum optics,astronomy, optical data storage and optical trapping.

Active sorting of orbital angular momentum states of light with cascaded tunable resonators