Bound States in the Continuum in the Visible Emerging from out-of-Plane Magnetic Dipoles

Shunsuke Murai (Corresponding author), Diego R. Abujetas, Gabriel W. Castellanos, José A. Sánchez-Gil (Corresponding author), Feifei Zhang, Jaime Gómez Rivas

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Abstract

Bound states in the continuum (BICs) are electromagnetic modes with a dispersion inside the light cone and infinite lifetimes. This exceptional property has led to intensive research and the demonstration of BICs in the gigahertz, teraherz, and near-infrared, up to the visible region. In this study, we design and experimentally demonstrate optical BICs using a subdiffraction lattice of Si nanodisks. The out-of-plane magnetic dipole resonance in the dielectric nanodisks couples with the subdiffraction lattice and defines a symmetry-protected BIC at normal incidence. This mode becomes a quasi-BIC as the angle of incidence is increased. The spectral position of the BIC can be controlled with the diameter of the nanodisks, which governs the out-of-plane magnetic dipole. The investigated BIC is robust to shape irregularities of the individual nanodisks. This robustness makes the design strategy of the BICs presented here very attractive for applications in which high fabrication precision can not be achieved.
Original languageEnglish
Pages (from-to)2204-2210
Number of pages7
JournalACS Photonics
Volume7
Issue number8
DOIs
Publication statusPublished - 19 Aug 2020

Funding

We thank K. Agata and M. Higashino (Kyoto U., Japan) for the RTA and optical measurements. This work was partly supported by the Nanotechnology Hub, Kyoto University and Kitakyusyu FAIS in the “Nanotechnology Platform Project,” sponsored by MEXT, Japan. We gratefully acknowledge the financial support from Kakenhi (17KK0133, 19H02434) and The Netherlands Organisation for Scientific Research (NWO) through Gravitation Grant “Research Centre for Integrated Nanophotonics” and Innovational Research Activities Scheme (Vici Project SCOPE No. 680-47-628). J.A.S.-G. and D.R.A. acknowledge support from the Spanish Ministerio de Ciencia e Innovación through Grants NANOTOPO FIS2017-91413-EXP, MELODIA PGC2018-095777-B-C21, and FPU Ph.D. Fellowship FPU15/03566 (MCIU/AEI/FEDER, UE). We thank K. Agata and M. Higashino (Kyoto U., Japan) for the RTA and optical measurements. This work was partly supported by the Nanotechnology Hub, Kyoto University and Kitakyusyu FAIS in the 'Nanotechnology Platform Project, ' sponsored by MEXT, Japan. We gratefully acknowledge the financial support from Kakenhi (17KK0133, 19H02434) and The Netherlands Organisation for Scientific Research (NWO) through Gravitation Grant 'Research Centre for Integrated Nanophotonics' and Innovational Research Activities Scheme (Vici Project SCOPE No. 680-47-628). J.A.S.-G. and D.R.A. acknowledge support from the Spanish Ministerio de Ciencia e Innovacion through Grants NANOTOPO FIS2017-91413- EXP, MELODIA PGC2018-095777-B-C21, and FPU Ph.D. Fellowship FPU15/03566 (MCIU/AEI/FEDER, UE).

FundersFunder number
Ministerio de Ciencia e InnovaciónNANOTOPO FIS2017-91413
Ministerio de Ciencia e InnovaciónPGC2018-095777-B-C21, NANOTOPO FIS2017-91413-EXP, FPU15/03566
Ministry of Education, Culture, Sports, Science and Technology17KK0133, 19H02434
Nederlandse Organisatie voor Wetenschappelijk Onderzoek680-47-628

    Keywords

    • bound states in the continuum
    • dielectric metasurfaces
    • silicon nanoparticles

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