Spin-orbit interaction of light induced by transverse spin angular momentum engineering

Author(s):

Zengkai Shao and Jiangbo Zhu and Yujie Chen and Yanfeng Zhang and Siyuan Yu

Abstract:

“The investigations on optical angular momenta and their interactions have broadened our knowledge of light’s behavior at sub-wavelength scales. Recent studies further unveil the extraordinary characteristics of transverse spin angular momentum in confined light fields and orbital angular momentum in optical vortices. Here we demonstrate a direct interaction between these two intrinsic quantities of light. By engineering the transverse spin in the evanescent wave of a whispering-gallery-mode-based optical vortex emitter, a spin-orbit interaction is observed in generated vortex beams. Inversely, this unconventional spin-orbit interplay further gives rise to an enhanced spin-direction locking effect in which waveguide modes are unidirectionally excited, with the directionality jointly controlled by the spin and orbital angular momenta states of light. The identification of this previously unknown pathway between the polarization and spatial degrees of freedom of light enriches the spin-orbit interaction phenomena, and can enable various functionalities in applications such as communications and quantum information processing.”

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Publication: Nature Communications

Issue/Year/DOI: Nature Communicationsvolume 9, Article number: 926 (2018)
DOI: 10.1038/s41467-018-03237-5

Programmable Vector Mode Multiplexer

Author(s): N. K. Fontaine and H. Chen and R. Ryf and D. Neilson and J. C. Alvarado and J. van Weerdenburg and R. Amezcua-Correa and C. Okonkwo and J. Carpenter

Abstract:

“We demonstrate a programmable vector mode multiplexer using a low-loss spatial light phase modulator that can multiplex 10 modes. It is reconfigured to generate modes for multi-mode fiber and modes with arbitrary polarization including linear, radial, and azimuthal.”

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Publication: 2017 European Conference on Optical Communication (ECOC)

Issue/Year/DOI: 2017 European Conference on Optical Communication (ECOC)
DOI: 10.1109/ECOC.2017.8346099

Miniature wide-spectrum mode sorter for vortex beams produced by 3D laser printing

Author(s):

Shlomi Lightman and Gilad Hurvitz and Raz Gvishi and Ady Arie

Abstract:

“Optical vortex beams can be used as carriers of information in optical communication and quantum optics applications. Owing to their spatial orthogonality, these beams can be multiplexed and demultiplexed, but up until now this was primarily achieved by bulky and large devices. In this work, a new approach is used to fabricate miniature vortex mode sorters based on three-dimensional laser printing, thereby enabling direct integration into optical systems. Mode sorters that are composed of two separate elements as well as a single integrated device are presented. These devices can handle both pure and mixed vortex beams with topological charge |𝑙|3 and |𝑙|2 for the dual-element device and integrated system, respectively. Mode-sorter spectral bandwidth and surface-quality effects are also discussed.”

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Publication: Optica

Issue/Year/DOI: Optica, Vol 4. , Issue 6, pp. 605- 610 (2018)
DOI: 10.1364/OPTICA.4.000605

Linearly polarized vector modes: enabling MIMO-free mode-division multiplexing

Author(s):

Lixian Wang, Reza Mirzaei Nejad, Alessandro Corsi, Jiachuan Lin, Younès Messaddeq, Leslie Rusch, and Sophie LaRochelle

Abstract:

“We experimentally investigate mode-division multiplexing in an elliptical ring core fiber (ERCF) that supports linearly polarized vector modes (LPV). Characterization show that the ERCF exhibits good polarization maintaining properties over eight LPV modes with effective index difference larger than 1 × 10−4. The ERCF further displays stable mode power and polarization extinction ratio when subjected to external perturbations. Crosstalk between the LPV modes, after propagating through 0.9 km ERCF, is below −14 dB. By using six LPV modes as independent data channels, we achieved the transmission of 32 Gbaud QPSK over 0.9 km ERCF without any multiple-input-multiple-output (MIMO) or polarization-division multiplexing (PDM) signal processing.”

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Publication:Optics Express

Issue/Year/DOI: Optics Express Vol. 25, Issue 10, pp. 11736-11749 (2017)

DOI: 10.1364/OE.25.011736