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Macroscopic direct observation of optical spin-dependent lateral forces and left-handed torques


Observing and taming the effects arising from non-trivial light–matter interaction has always triggered scientists to better understand nature and develop photonic technologies. However, despite tremendous conceptual advances1,2, so far there have been only a few experimental proposals to reveal unusual optomechanical manifestations that are hardly seen in everyday life, such as negative radiation pressure3,4, transverse forces5,6 or left-handed torques7. Here, we report naked-eye identification of spin-dependent lateral displacements of centimetre-sized objects endowed with structured birefringence. Left-handed macroscopic rotational motion is also reported. The unveiled effects ultimately rely on spin–orbit optical interactions and are driven by lateral force fields that are five orders of magnitude larger than those reported previously, as a result of the proposed design. By highlighting the spin–orbit optomechanics of anisotropic and inhomogeneous media, these results allow structured light–matter interaction to move from a scientific curiosity to a new asset for the optical manipulation toolbox.

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Fig. 1: Spin-dependent lateral optical forces from spin–orbit scattering by a one-dimensional geometric phase optical element.
Fig. 2: Macroscopic direct observation of spin-dependent lateral optical forces.
Fig. 3: Principle of right- and left-handed optical radiation torques.
Fig. 4: Macroscopic direct observation of the angular analogue of lateral optical forces.
Fig. 5: Quantitative analysis of right- and left-handed optical radiation torque.

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  1. Bliokh, K. Y., Rodrguez-Fortuño, F. J., Nori, F. & Zayats, A. V. Spin–orbit interactions of light. Nat. Photon. 9, 796–808 (2015).

    Article  ADS  Google Scholar 

  2. Sukhov, S. & Dogariu, A. Non-conservative optical forces. Rep. Prog. Phys. 80, 112001 (2017).

    Article  ADS  MathSciNet  Google Scholar 

  3. Brzobohaty, O. et al. Experimental demonstration of optical transport, sorting and self-arrangement using a ‘tractor beam’. Nat. Photon. 7, 123–127 (2013).

    Article  ADS  Google Scholar 

  4. Dogariu, A., Sukhov, S. & Saenz, J. J. Optically induced ‘negative forces’. Nat. Photon. 7, 24–27 (2013).

    Article  ADS  Google Scholar 

  5. Sukhov, S., Kajorndejnukul, V., Naraghi, R. R. & Dogariu, A. Dynamic consequences of optical spin–orbit interaction. Nat. Photon. 9, 809–812 (2015).

    Article  ADS  Google Scholar 

  6. Antognozzi, M. et al. Direct measurements of the extraordinary optical momentum and transverse spin-dependent force using a nano-cantilever. Nat. Phys. 12, 731–735 (2016).

    Article  Google Scholar 

  7. Hakobyan, D. & Brasselet, E. Left-handed optical radiation torque. Nat. Photon. 8, 610–614 (2014).

    Article  ADS  Google Scholar 

  8. Bliokh, K. Y., Bekshaev, A. Y. & Nori, F. Extraordinary momentum and spin in evanescent waves. Nat. Commun. 5, 3300 (2014).

    Article  ADS  Google Scholar 

  9. Canaguier-Durand, A. & Genet, C. Transverse spinning of a sphere in a plasmonic field. Phys. Rev. A 89, 033841 (2014).

    Article  ADS  Google Scholar 

  10. Rodrguez-Fortuño, F. J., Engheta, N., Martnez, A. & Zayats, A. V. Lateral forces on circularly polarizable particles near a surface. Nat. Commun. 6, 8799 (2015).

    Article  ADS  Google Scholar 

  11. Scheel, S., Buhmann, S. Y., Clausen, C. & Schneeweiss, P. Directional spontaneous emission and lateral Casimir–Polder force on an atom close to a nanofiber. Phys. Rev. A 92, 043819 (2015).

    Article  ADS  Google Scholar 

  12. Movassagh, R. & Johnson, S. G. Optical Bernoulli forces. Phys. Rev. A 88, 023829 (2013).

    Article  ADS  Google Scholar 

  13. Sukhov, S., Kajorndejnukul, V., Broky, J. & Dogariu, A. Forces in Aharonov–Bohm optical setting. Optica 1, 383–387 (2014).

    Article  Google Scholar 

  14. Bekshaev, A. Y., Bliokh, K. Y. & Nori, F. Transverse spin and momentum in two-wave interference. Phys. Rev. X 5, 011039 (2015).

    Google Scholar 

  15. Fardad, S. et al. Scattering detection of a solenoidal Poynting vector field. Opt. Lett. 41, 3615–3618 (2016).

    Article  ADS  Google Scholar 

  16. Wang, S. B. & Chan, C. T. Lateral optical force on chiral particles near a surface. Nat. Commun. 5, 3307 (2014).

    Article  ADS  Google Scholar 

  17. Cameron, R. P., Barnett, S. M. & Yao, A. M. Discriminatory optical force for chiral molecules. New J. Phys. 16, 013020 (2014).

    Article  ADS  Google Scholar 

  18. Hayat, A., Mueller, J. B. & Capasso, F. Lateral chirality-sorting optical forces. Proc. Natl Acad. Sci. USA 112, 13190–13194 (2015).

    Article  ADS  Google Scholar 

  19. Canaguier-Durand, A. & Genet, C. Plasmonic lateral forces on chiral spheres. J. Opt. 18, 015007 (2015).

    Article  ADS  Google Scholar 

  20. Alizadeh, M. & Reinhard, B. M. Transverse chiral optical forces by chiral surface plasmon polaritons. ACS Photon. 2, 1780–1788 (2015).

    Article  Google Scholar 

  21. Cipparrone, G., Hernandez, R. J., Pagliusi, P. & Provenzano, C. Magnus force effect in optical manipulation. Phys. Rev. A 84, 015802 (2011).

    Article  ADS  Google Scholar 

  22. Bomzon, Z., Biener, G., Kleiner, V. & Hasman, E. Space-variant Pancharatnam–Berry phase optical elements with computer-generated subwavelength gratings. Opt. Lett. 27, 1141–1143 (2002).

    Article  ADS  Google Scholar 

  23. Nikolova, L. & Todorov, T. Diffraction efficiency and selectivity of polarization holographic recording. Opt. Acta 31, 579–588 (1984).

    Article  ADS  Google Scholar 

  24. Tabiryan, N. V., Nersisyan, S. R., Steeves, D. M. & Kimball, B. R. The promise of diffractive waveplates. Opt. Photon. News 21, 41–45 (2010).

    Article  Google Scholar 

  25. Simpson, S. H. & Hanna, S. Optical trapping of spheroidal particles in Gaussian beams. J. Opt. Soc. Am. A 24, 430–443 (2007).

    Article  ADS  Google Scholar 

  26. Haefner, D., Sukhov, S. & Dogariu, A. Conservative and nonconservative torques in optical binding. Phys. Rev. Lett. 103, 173602 (2009).

    Article  ADS  Google Scholar 

  27. Chen, J. et al. Negative optical torque. Sci. Rep. 42, 6386 (2014).

    Google Scholar 

  28. Nieto-Vesperinas, M. Optical torque on small bi-isotropic particles. Opt. Lett. 40, 3021–3024 (2015).

    Article  ADS  Google Scholar 

  29. Canaguier-Durand, A. & Genet, C. Chiral route to pulling optical forces and left-handed optical torques. Phys. Rev. A 92, 043823 (2015).

    Article  ADS  Google Scholar 

  30. Marrucci, L., Manzo, C. & Paparo, D. Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media. Phys. Rev. Lett. 96, 163905 (2006).

    Article  ADS  Google Scholar 

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This study received financial support from CONACYT Mexico.

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Authors and Affiliations



H.M. realized the experimental set-up, conducted the experiments and analysed data. E.B. conceived the experiment, analysed data and supervised the project. E.B. wrote the paper.

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Correspondence to Etienne Brasselet.

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The authors declare no competing interests.

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Supplementary information

Supplementary Video 1

Macroscopic naked-eye observation of optical lateral force.

Supplementary Video 2

Macroscopic naked-eye observation of optical right-/left-handed torque.

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Magallanes, H., Brasselet, E. Macroscopic direct observation of optical spin-dependent lateral forces and left-handed torques. Nature Photon 12, 461–464 (2018).

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