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OPTICAL DEVICE FOR DEMULTIPLEXING AND MULTIPLEXING MODES WITH DIFFERENT ORBITAL ANGULAR MOMENTUM
OPTICAL DEVICE FOR DEMULTIPLEXING AND MULTIPLEXING MODES WITH DIFFERENT ORBITAL ANGULAR MOMENTUM
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机译：具有不同轨道角动量的解复用和复用模式的光学装置
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摘要
It is disclosed an optical device (10-5, 10-3) for demultiplexing modes with different orbital angular momentum. The device comprises a substrate slab having two surfaces (2- 112, 2-126; 2-12, 2-26) at least partially facing each other and comprises two films arranged on the two surfaces respectively, wherein at least one of the two films includes a first diffractive optical zone (2-112a, 2-12a) and a second diffractive optical zone (2-126a, 2-12b). The first zone (2-112a, 2-12a) is configured to receive a multiplexed input free-space optical beam carrying a plurality of orbital angular momentum modes (OAM1, OAM2) with different orbital angular momentum, is configured to perform a conformal mapping of the multiplexed input free-space optical beam from a circular distribution to a linear distribution of luminous intensity, generate therefrom a plurality of unwrapping free-space optical beam, split the plurality of unwrapping free-space optical beams into corresponding groups of copies and generate therefrom a plurality of groups of copies of unwrapping free-space optical beams having a propagation direction which is tilted with respect to a propagation direction of the multiplexed input free-space optical beam. The substrate is configured to propagate the tilted plurality of group of copies of unwrapping free-space optical beams towards the second zone and generate therefrom a corresponding propagated plurality of groups of copies of unwrapped free-space optical beams. The second zone (2-126a, 2-12b) is configured to receive the propagated plurality of groups of copies of unwrapped free-space optical beams, perform a phase correction of the propagated plurality of groups of copies of unwrapped free- space optical beams and generate therefrom a plurality of phase-corrected free-space optical beams having different directions in the space depending on the orbital angular momentum of the plurality of received orbital angular momentum modes.
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