Rotatum of light

Ahmed Dorrah; Alfonso Palmieri; Lisa Li; Federico Capasso

doi:10.1126/sciadv.adr9092

Rotatum of light

Ahmed Dorrah (Corresponding author-nrf)
, Alfonso Palmieri
, Lisa Li
, Federico Capasso (Corresponding author)

Photonics and Semiconductor Nanophysics

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

18 Citaten (Scopus)

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Vortices are ubiquitous in nature and can be observed in fluids, condensed matter, and even in the formation of galaxies. Light, too, can evolve like a vortex. Optical vortex beams are exploited in light-matter interaction, free space communications, and imaging. Here, we introduce optical rotatum, a behavior of light in which an optical vortex beam experiences a quadratic chirp in its orbital angular momentum along the optical path. We show that such an adiabatic deformation of topology is associated with the accumulation of a Gouy phase factor, which, in turn, perturbs the propagation constant (spatial frequency) of the beam. The spatial structure of optical rotatum follows a logarithmic spiral—a signature that is commonly seen in the pattern formation of seashells and galaxies. Our work expands the previous literature on structured light, offers new modalities for light-matter interaction, communications, and sensing, and hints at analogous effects in condensed matter physics and Bose-Einstein condensates.

Originele taal-2	Engels
Artikelnummer	adr9092
Aantal pagina's	11
Tijdschrift	Science Advances
Volume	11
Nummer van het tijdschrift	15
DOI's	https://doi.org/10.1126/sciadv.adr9092
Status	Gepubliceerd - 11 apr. 2025

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Acknowledgments: We wish to thank M. v. Berry for the insightful advice. We also acknowledge S. W. D. lim and J. Oh both of harvard University for the useful discussion. Funding: A.h.D. acknowledges financial support from the natural Sciences and engineering Research council of canada (nSeRc) under award no. PDF-533013-2019 and from the Optica Foundation challenge program. F.c. acknowledges financial support from the Office of naval Research (OnR), under the MURi program, grant no. n00014-20-1-2450, and from the Air Force Office of Scientific Research (AFOSR), under grant no. FA9550-22-1-0243. Author contributions: A.h.D. conceived the theory, developed the simulation, designed and built the experiment, and analyzed the data. A.P. created the computer-generated holograms, performed the measurements, and analyzed and processed the data. l.l. contributed to the data acquisition and analysis. F.c. supervised the project. All authors contributed to writing the manuscript. Competing interests: the authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. We wish to thank M. V. Berry for the insightful advice. We also acknowledge S. W. D. Lim and J. Oh both of Harvard University for the useful discussion. A.H.D. acknowledges financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC) under award no. PDF-533013-2019 and from the Optica Foundation Challenge program. F.C. acknowledges financial support from the Office of Naval Research (ONR), under the MURI program, grant no. N00014-20-1-2450, and from the Air Force Office of Scientific Research (AFOSR), under grant no. FA9550-22-1-0243.

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Rotatum of light

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