Chirality is the absence of mirror symmetry leading to different interaction of the matter with light of opposite handedness. In achiral nanostructures such as asymmetric metasurfaces, extrinsic chirality can be induced with proper orientation of the experimental set-up. Circular dichroism (CD) is a standard technique for probing chirality, but conventional extinction measurements are limited by the scattering. Here we explore extrinsic chirality using a photo-acustic spetroscopy (PAS) with a widely tuneable laser. The PAS allows for direct measurement of local absorption by monitoring the heat produced and transferred to the surrounding air, regardless of the scattered light. In this study, we study extrinsic chirality in silver-coated asymmetric metasurfaces. Our new PAS set-up has numerous degrees of freedom: light wavelength, polarization and incidence angle, as well as the planar translation stage, the rotation stage, and the modulation frequency which controls the absorption depth.

Photo-acoustic technique with widely tuneable laser / Skubisz, C.; Petronijevic, E.; Leahu, G.; Cesca, T.; Scian, C.; Mattei, G.; Sibilia, C.; Belardini, A.. - (2024). (Intervento presentato al convegno Plasmonica Workshop on Plasmonics and Nano-optics 10-12 July 2024 in Messina (Italy) tenutosi a Messina).

Photo-acoustic technique with widely tuneable laser

C. Skubisz;E. Petronijevic;C. Sibilia;A. Belardini
2024

Abstract

Chirality is the absence of mirror symmetry leading to different interaction of the matter with light of opposite handedness. In achiral nanostructures such as asymmetric metasurfaces, extrinsic chirality can be induced with proper orientation of the experimental set-up. Circular dichroism (CD) is a standard technique for probing chirality, but conventional extinction measurements are limited by the scattering. Here we explore extrinsic chirality using a photo-acustic spetroscopy (PAS) with a widely tuneable laser. The PAS allows for direct measurement of local absorption by monitoring the heat produced and transferred to the surrounding air, regardless of the scattered light. In this study, we study extrinsic chirality in silver-coated asymmetric metasurfaces. Our new PAS set-up has numerous degrees of freedom: light wavelength, polarization and incidence angle, as well as the planar translation stage, the rotation stage, and the modulation frequency which controls the absorption depth.
2024
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1731772
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