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Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 54: Nanostructured surfaces and thin films

O 54.6: Vortrag

Mittwoch, 11. März 2026, 11:45–12:00, HSZ/0201

Probing Electromagnetic Chirality in Nanoresonators Using Scanning Reflection Anisotropy Microscopy — •Fabian Haake — ETH Zurich, Switzerland

We report on the application of a Scanning Reflection Anisotropy Microscope (SRAM) to study metasurfaces consisting of chiral nanoresonators. SRAM is a polarization-modulated optical method previously applied to strain mapping in crystalline materials and, more recently, demonstrated for amorphous systems (Sendra et al., 2023; APL. 124, 171102, 2024). The structures were fabricated on Si3N4 TEM membranes using electron-beam lithography and metal deposition. Arrays of left- and right-handed resonators were fabricated and probed, showing a wavelength-dependent RAS contrast between the two enantiomorphic forms. Finite-element simulations under circularly polarized illumination reproduce the observed handedness-dependent responses. The results demonstrate that SRAM sensitively resolves enantiomer-specific optical signals at the microscopic scale, enabling direct characterization of electromagnetic chirality in metasurfaces.

Keywords: SRAM; RAS; chiral; metasurface; reflection anisotropy spectroscopy

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