Half‐Integer Topological Charge Polarization of Quasi‐Dirac Bound States in the Continuum

De Tommasi, Edoardo; Romano, Silvia; Mocella, Vito; Sgrignuoli, Fabrizio; Lanzio, Vittorino; Cabrini, Stefano; Zito, Gianluigi

doi:10.1002/adom.202300475

Title: Half‐Integer Topological Charge Polarization of Quasi‐Dirac Bound States in the Continuum

Journal Article · Sun May 28 00:00:00 EDT 2023 · Advanced Optical Materials

DOI:https://doi.org/10.1002/adom.202300475· OSTI ID:1975437

^[1]; Romano, Silvia ^[1]; Mocella, Vito ^[1]; Sgrignuoli, Fabrizio ^[1]; Lanzio, Vittorino ^[2]; Cabrini, Stefano ^[2]; Zito, Gianluigi ^[1]

National Research Council Institute of Applied Sciences and Intelligent Systems “E. Caianiello” Unit of Naples, Via P. Castellino 111 Naples I‐80131 Italy
Lawrence Berkeley National Laboratory Molecular Foundry Division 67 Cyclotron Road, Berkeley California CA 94720 USA

Abstract The non‐trivial polarization topology of bound states in the continuum (BICs) provides new strategies in nanophotonics. The polarization topology depends on the geometric parameters and energy‐momentum dispersion of the system and can be engineered to add specific functionalities for light molding. Herein, such a possibility is investigated by studying the topology of the polarization states associated with the optical field radiated by BICs when Dirac‐cone‐degeneracy is lifted. The opening of a pseudogap in the Dirac cone dispersion of square‐lattice dielectric photonic crystal slabs is achieved by tuning the slab thickness. First, the emergence of half‐integer topological charges without the requirement of BIC annihilation is theoretically shown, which instead occurs when in‐plane inversion symmetry is broken. Then, using spin‐to‐orbital angular momentum conversion, the theory of half‐integer topological charges mediated by BICs is demonstrated and experimentally proved. The same device is able to give rise to vortices with different orbital angular momentum depending on the way it is illuminated, thus improving the potential of optical multiplexing. In addition, the additive character of the topology‐induced phase‐vortex generation is finally demonstrated for both integer and half‐integer charges using also vortex states as input beams, which is of relevance for information delivery.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: No.DE‐AC02‐05CH11231; AC02‐05CH11231

OSTI ID:: 1975437

Alternate ID(s):: OSTI ID: 1975438; OSTI ID: 2205629

Journal Information:: Advanced Optical Materials, Journal Name: Advanced Optical Materials Vol. 11 Journal Issue: 18; ISSN 2195-1071

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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36 MATERIALS SCIENCE
bound states in the continuum
Dirac cone
half-integer topological charge
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spin-to-orbital angular momentum conversion

Title: Half‐Integer Topological Charge Polarization of Quasi‐Dirac Bound States in the Continuum

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