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Detection of Orbital Angular Momentum of Light Using Cavity Optomechanics

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Abstract

We introduce a nanoscale cavity-optomechanical device for non-destructively measuring orbital angular momentum (OAM) of light by detecting torque on a subwavelength grating. The device is based on a photonic crystal cavity and can measure the torque produced by a change Δl = 1 in OAM from a beam with power Pmin 2 µW at an incident wavelength of λ = 780 nm at a cryogenic temperature T = 4 K.

© 2018 The Author(s)

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