Angular dependence and absorption properties of the anapole mode of Si nano-disks

Fornasari, Lucia; Passoni, Marco; Marabelli, F.; Chen, Y.; Wang, Yu; Negro, Luca Dal

doi:10.1063/5.0026042

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…The response radically changes for the TE mode (Figure d), which slightly blue-shifts, then gradually disappearing at high angles, matching again the simulated trend (see Figure S5 in the Supporting Information). It is worth noting that such a different angular behavior between TE and TM modes has been previously observed also in other dielectric nanodisks metasurfaces, being strongly affected by the perturbation of additional electromagnetic multipoles, besides the anapole modes. , …”

Section: Resultsmentioning

confidence: 52%

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k-Space Hyperspectral Imaging by a Birefringent Common-Path Interferometer

et al. 2022

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Fourier-plane microscopy is a powerful tool for measuring the angular optical response of a plethora of materials and photonic devices. Among them, optical microcavities feature distinctive energy-momentum dispersions, crucial for a broad range of fundamental studies and applications. However, measuring the whole momentum space (k-space) with sufficient spectral resolution using standard spectroscopic techniques is challenging, requiring long and alignment-sensitive scans. Here, we introduce a k-space hyperspectral microscope, which uses a common-path birefringent interferometer to image photoluminescent organic microcavities, obtaining an angle-and wavelength-resolved view of the samples in only one measurement. The exceptional combination of angular and spectral resolution of our technique allows us to reconstruct a three-dimensional (3D) map of the cavity dispersion in the energy-momentum space, revealing the polarization-dependent behavior of the resonant cavity modes. Furthermore, we apply our technique for the characterization of a dielectric nanodisk metasurface, evidencing the angular and spectral behavior of its anapole mode. This approach is able to provide a complete optical characterization for materials and devices with nontrivial angle-/wavelength-dependent properties, fundamental for future developments in the fields of topological photonics and optical metamaterials.

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Section: Resultsmentioning

confidence: 52%

“…It is worth noting that such a different angular behavior between TE and TM modes has been previously observed also in other dielectric nanodisks metasurfaces, being strongly affected by the perturbation of additional electromagnetic multipoles, besides the anapole modes. 46,47…”

Section: Analysis Of the Cavity Dispersionmentioning

confidence: 99%

k-Space Hyperspectral Imaging by a Birefringent Common-Path Interferometer

et al. 2022

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Wide angle anapole excitation in stacked resonators

Vennberg,

Angelsten,

Anttu

et al. 2024

Opt. Express

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In the search for resonances with high localized field strengths in all-dielectric nanophotonics, novel states such as anapoles, hybrid anapoles and bound states in the continuum have been realized. Of these, the anapoles are the most readily achievable. Interaction between vertically stacked disks supporting anapole resonances increases the field localization further. When fabricated from materials with high non-linear coefficients, such stacked disk pillars can be used as non-linear antennas. The excitation of such 3D pillars often includes off normal incidence when using focusing optics. Therefore, it is important to evaluate the angular and polarization response of such pillars. In the paper we fabricate pillars with three AlGaAs disks in a stack separated by stems of GaAs. The angular and polarization responses are evaluated experimentally with integrating sphere measurements and numerically through simulation, multipole decomposition and quasi-normal modes. We find that the stacked geometry shows hybridized anapole excitation for a broad span of incidence angles, with tunability of the individual multipolar response up to octupoles, including an electric octupole anapole, and we show how the average enhanced confined energy varies under angled excitation. The results show that the vertical stacked geometry can be used with highly focusing optics for efficient in-coupling to the hybridized anapole.

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Angular dependence and absorption properties of the anapole mode of Si nano-disks

Cited by 2 publications

References 29 publications

k-Space Hyperspectral Imaging by a Birefringent Common-Path Interferometer

k-Space Hyperspectral Imaging by a Birefringent Common-Path Interferometer

Wide angle anapole excitation in stacked resonators

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