Direct Observation of Lateral Field Confinement in Symmetry-Protected THz Bound States in the Continuum

Stan ter Huurne; Diego R. Abujetas; Niels van Hoof; Jose A. Sanchez-Gil; Jaime Gómez Rivas

doi:10.1002/adom.202202403

Direct Observation of Lateral Field Confinement in Symmetry-Protected THz Bound States in the Continuum

Stan ter Huurne (Corresponding author), Diego R. Abujetas, Niels van Hoof, Jose A. Sanchez-Gil, Jaime Gómez Rivas (Corresponding author)

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Electromagnetic field confinement on sub-wavelength scales is possible at the expense of increasing optical losses. Examples are surface plasmon polaritons and resonant structures, which suffer from absorption losses and radiative outcoupling, respectively. Here, the first experimental evidence of strong electromagnetic field confinement along the lateral (out-of-plane) direction in a near lossless metasurface that supports a symmetry-protected Bound State in the Continuum is shown, which fully suppresses the radiative losses of resonant scatterers. This experimental demonstration, supported by coupled dipole calculations, is measured by a double near-field probe technique to locally excite and detect the time evolution and confinement of the electric field onto the surface, achieving an amplitude decay length from the metasurface of λ/38 at 0.39 THz.

Original language	English
Article number	2202403
Number of pages	6
Journal	Advanced Optical Materials
Volume	11
Issue number	6
Early online date	13 Jan 2023
DOIs	https://doi.org/10.1002/adom.202202403
Publication status	Published - 17 Mar 2023

Funding

The authors acknowledge Francesco Verdelli for fabricating the samples. The authors thank Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) (Vici 680‐47‐628); Spanish MCIN/AEI/10.13039/501100011033/ and ERDF A way of making Europe & NextGenerationEU/PRTR through the grants MELODIA (PGC2018‐095777‐B‐C21) and BICPLAN6G (TED2021‐131417B‐I00) for funding.

Keywords

electromagnetic field confinement
lossless resonant system
metasurfaces
symmetry-protected bound states in the continuum
THz near-field microscopy
THz time-domain spectroscopy

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title = "Direct Observation of Lateral Field Confinement in Symmetry-Protected THz Bound States in the Continuum",

abstract = "Electromagnetic field confinement on sub-wavelength scales is possible at the expense of increasing optical losses. Examples are surface plasmon polaritons and resonant structures, which suffer from absorption losses and radiative outcoupling, respectively. Here, the first experimental evidence of strong electromagnetic field confinement along the lateral (out-of-plane) direction in a near lossless metasurface that supports a symmetry-protected Bound State in the Continuum is shown, which fully suppresses the radiative losses of resonant scatterers. This experimental demonstration, supported by coupled dipole calculations, is measured by a double near-field probe technique to locally excite and detect the time evolution and confinement of the electric field onto the surface, achieving an amplitude decay length from the metasurface of λ/38 at 0.39 THz.",

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note = "Funding Information: The authors acknowledge Francesco Verdelli for fabricating the samples. The authors thank Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) (Vici 680‐47‐628); Spanish MCIN/AEI/10.13039/501100011033/ and ERDF A way of making Europe & NextGenerationEU/PRTR through the grants MELODIA (PGC2018‐095777‐B‐C21) and BICPLAN6G (TED2021‐131417B‐I00) for funding. Publisher Copyright: {\textcopyright} 2023 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH.",

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AU - Gómez Rivas, Jaime

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N2 - Electromagnetic field confinement on sub-wavelength scales is possible at the expense of increasing optical losses. Examples are surface plasmon polaritons and resonant structures, which suffer from absorption losses and radiative outcoupling, respectively. Here, the first experimental evidence of strong electromagnetic field confinement along the lateral (out-of-plane) direction in a near lossless metasurface that supports a symmetry-protected Bound State in the Continuum is shown, which fully suppresses the radiative losses of resonant scatterers. This experimental demonstration, supported by coupled dipole calculations, is measured by a double near-field probe technique to locally excite and detect the time evolution and confinement of the electric field onto the surface, achieving an amplitude decay length from the metasurface of λ/38 at 0.39 THz.

AB - Electromagnetic field confinement on sub-wavelength scales is possible at the expense of increasing optical losses. Examples are surface plasmon polaritons and resonant structures, which suffer from absorption losses and radiative outcoupling, respectively. Here, the first experimental evidence of strong electromagnetic field confinement along the lateral (out-of-plane) direction in a near lossless metasurface that supports a symmetry-protected Bound State in the Continuum is shown, which fully suppresses the radiative losses of resonant scatterers. This experimental demonstration, supported by coupled dipole calculations, is measured by a double near-field probe technique to locally excite and detect the time evolution and confinement of the electric field onto the surface, achieving an amplitude decay length from the metasurface of λ/38 at 0.39 THz.

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Direct Observation of Lateral Field Confinement in Symmetry-Protected THz Bound States in the Continuum

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