Abstract
All known methods for transverse confinement and guidance of light rely on modification of the refractive index, that is, on the scalar properties of electromagnetic radiation1,2,3,4,5,6,7,8,9,10,11. Here, we disclose the concept of a dielectric waveguide that exploits vectorial spin–orbit interactions of light and the resulting geometric phases12,13,14,15,16,17. The approach relies on the use of anisotropic media with an optic axis that lies orthogonal to the propagation direction but is spatially modulated, so that the refractive index remains constant everywhere. A spin-controlled cumulative phase distortion is imposed on the beam, balancing diffraction for a specific polarization. As well as theoretical analysis, we present an experimental demonstration of the guidance using a series of discrete geometric-phase lenses made from liquid crystal. Our findings show that geometric phases may determine the optical guiding behaviour well beyond a Rayleigh length, paving the way to a new class of photonic devices. The concept is applicable to the whole electromagnetic spectrum.
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Acknowledgements
The work in Naples was supported by the 7th Framework Programme of the European Commission, within the Future Emerging Technologies programme, under grant no. 255914 (PHORBITECH), and by the European Research Council (ERC), under grant no. 694683 (PHOSPhOR). A.A. and G.A. thank the Academy of Finland for financial support through FiDiPro grant no. 282858. C.P.J. gratefully acknowledges Fundação para a Ciência e a Tecnologia, POPH-QREN and FSE (FCT, Portugal) for fellowship no. SFRH/BPD/77524/2011.
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This work was jointly conceived by A.A., C.P.J., G.A. and L.M. S.S. designed and carried out the experiment, with the help and supervision of B.P., E.S. and L.M. A.A. and C.P.J. developed the theory and performed the numerical simulations, with the help and supervision of L.M. and G.A. All authors discussed the results and contributed to the manuscript.
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Slussarenko, S., Alberucci, A., Jisha, C. et al. Guiding light via geometric phases. Nature Photon 10, 571–575 (2016). https://doi.org/10.1038/nphoton.2016.138
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DOI: https://doi.org/10.1038/nphoton.2016.138
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