ABSTRACT Optical vortices, beams with spiral wavefronts and screw phase dislocations, have been attracting increasing interest in various fields. Here, we theoretically propose and

experimentally realize an easy approach to generating optical vortices. We leverage the inherent momentum-space topological vortex-like response of polarization (strong polarization

anisotropy) around bound states in the continuum of two-dimensional periodic structures, for example photonic crystal slabs, to induce Pancharatnam–Berry phases and spin–orbit interaction in

the beams. This new class of optical vortex generators operates in momentum space, meaning that the structure is almost homogeneous without a real-space centre. In principle, any even-order

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support SIMILAR CONTENT BEING VIEWED BY OTHERS OPTICAL VORTEX LADDER VIA SISYPHUS PUMPING OF PSEUDOSPIN Article Open access 03 September 2024 SPONTANEOUS GENERATION AND ACTIVE MANIPULATION

OF REAL-SPACE OPTICAL VORTICES Article 12 October 2022 TOPOLOGICAL ORBITAL ANGULAR MOMENTUM EXTRACTION AND TWOFOLD PROTECTION OF VORTEX TRANSPORT Article Open access 20 November 2024 DATA

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13, 283–288 (2019). ADS  Google Scholar  Download references ACKNOWLEDGEMENTS We thank C. T. Chan and H. Yin for discussions. The work was supported by the China National Key Basic Research

Program (2016YFA0301103, 2016YFA0302000 and 2018YFA0306201) and the National Science Foundation of China (11774063, 11727811, 91750102 and 91963212). L.S. was further supported by the

Science and Technology Commission of Shanghai Municipality (19XD1434600, 2019SHZDZX01 and 19DZ2253000). AUTHOR INFORMATION Author notes * These authors contributed equally: Bo Wang, Wenzhe

Liu, Maoxiong Zhao. AUTHORS AND AFFILIATIONS * State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of

Physics, Fudan University, Shanghai, China Bo Wang, Wenzhe Liu, Maoxiong Zhao, Jiajun Wang, Yiwen Zhang, Ang Chen, Fang Guan, Xiaohan Liu, Lei Shi & Jian Zi * Collaborative Innovation

Center of Advanced Microstructures, Nanjing University, Nanjing, China Xiaohan Liu, Lei Shi & Jian Zi * Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan,

China Jian Zi Authors * Bo Wang View author publications You can also search for this author inPubMed Google Scholar * Wenzhe Liu View author publications You can also search for this author

inPubMed Google Scholar * Maoxiong Zhao View author publications You can also search for this author inPubMed Google Scholar * Jiajun Wang View author publications You can also search for

this author inPubMed Google Scholar * Yiwen Zhang View author publications You can also search for this author inPubMed Google Scholar * Ang Chen View author publications You can also search

for this author inPubMed Google Scholar * Fang Guan View author publications You can also search for this author inPubMed Google Scholar * Xiaohan Liu View author publications You can also

search for this author inPubMed Google Scholar * Lei Shi View author publications You can also search for this author inPubMed Google Scholar * Jian Zi View author publications You can also

search for this author inPubMed Google Scholar CONTRIBUTIONS W.L., L.S. and J.Z. conceived the basic idea for this work. W.L. gave the theoretical explanation. B.W. and W.L. designed the

structures, carried out the finite-element method and the finite-difference time-domain method simulations and analysed the simulated and measured data. B.W. and J.W. performed the sample

fabrications. B.W., M.Z. and J.W. performed the optical measurements. M.Z. and Y.Z. constructed the measurement system. L.S. and J.Z. supervised the research and the development of the

manuscript. W.L. wrote the draft of the manuscript, and all authors took part in the discussion and revision and approved the final copy of the manuscript. CORRESPONDING AUTHORS

Correspondence to Wenzhe Liu, Lei Shi or Jian Zi. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing interests. ADDITIONAL INFORMATION PUBLISHER’S NOTE Springer Nature

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discussions. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Wang, B., Liu, W., Zhao, M. _et al._ Generating optical vortex beams by momentum-space

polarization vortices centred at bound states in the continuum. _Nat. Photonics_ 14, 623–628 (2020). https://doi.org/10.1038/s41566-020-0658-1 Download citation * Received: 23 September 2019

* Accepted: 04 June 2020 * Published: 06 July 2020 * Issue Date: October 2020 * DOI: https://doi.org/10.1038/s41566-020-0658-1 SHARE THIS ARTICLE Anyone you share the following link with

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