Generation, Detection and Application of Twisted Waves of Light and Neutrons

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• Charles W. Clark, Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland
• Thursday 16 February 2023, 14:00-15:00
• Physics East 217.

If you have a question about this talk, please contact Yeshpal Singh.

It was about 50 years ago today, when “Dislocations in wave trains” [1] came into play. Twenty years on, “Dislocations” became a 90’s hit following the ingenious experiments of Soskin et al. [2], that showed the promise of applications of twisted or structured light with non-vanishing orbital angular momentum about its propagation axis. [3-5] Modern use cases for such modalities include increased communication bandwidth for 6G applications.[6] Quantum particle beams can also be shaped by analogue tools of optics. I shall present recent results for neutrons, made possible by microfabricated synthetic holograms containing millions of forked dislocation gratings of the type envisaged by Soskin, et al. [7]

[1] “Dislocations in wave trains,” J. F. Nye and M. V. Berry, received 17 January 1973, published in Proc. Roy. Soc. Lond. A 366 , 165 – 190 (1974)

[2] “A tribute to Marat Soskin,” M. V. Berry, et al., J. Opt. 23, 050201 (2021)

[3] “Roadmap on structured waves,” K. Bliokh, et al., arXiv:2301.05349 (submitted 13 January 2023)

[4] “Roadmap on structured light,” H. Rubinsztein-Dunlop, et al., J. Opt. 19, 013001 (2017)

[5] “Optical orbital angular momentum,” S. M. Barnett, M. Babiker and M. J. Padgett, Phil. Trans. Roy. Soc. A 375 , 20150444 (2017)

[6] “Utilizing multiplexing of structured THz beams carrying orbital-angular-momentum for high-capacity communications,” H. Zhou, et al., Optics Express 30, 25418 (2022)

[7] “Experimental realization of neutron helical waves,” D. Sarenac, M. E. Henderson, H. Ekinci, C. W. Clark, D. G. Cory, L. DeBeer-Schmitt, M. G. Huber, C. Kapahi, D. A. Pushin, Sci. Adv. 8, eadd2002 (18 November 2022)

This talk is part of the Physics and Astronomy Colloquia series.

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