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

Genco, Armando; Cruciano, Cristina; Corti, Matteo; McGhee, Kirsty E.; Ardini, Benedetto; Sortino, Luca; Huettenhofer, Ludwig; Virgili, Tersilla; Lidzey, David G.; Maier, Stefan A.; Bassi, Andrea; Valentini, Gianluca; Cerullo, Giulio und Manzoni, Cristian (2022): k-Space Hyperspectral Imaging by a Birefringent Common-Path Interferometer. In: ACS Photonics, Bd. 9, Nr. 11: S. 3563-3572

Abstract

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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2330-4022
• Sprache: Englisch