Enhancing UV-active chiral nanostructures with inverse topology design

Atsushi Taguchi

doi:10.1117/12.3028701

4 October 2024 Enhancing UV-active chiral nanostructures with inverse topology design

Atsushi Taguchi

Author Affiliations +

Proceedings Volume PC13115, UV and Higher Energy Photonics: From Materials to Applications 2024; PC1311508 (2024) https://doi.org/10.1117/12.3028701
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Nanophotonic structures are crucial for controlling light at scales smaller than its wavelength. While designing for linear polarization is straightforward, creating nanostructures for helically structured light, like circularly polarized light and optical vortices, is challenging due to complex near-field chiral interactions with matters in helical electromagnetic fields. In this presentation, we apply topology optimization, an intelligent design approach, to create 3D nanogap antenna structures with outstanding chiroptical functionalities. With these structures, we demonstrate giant chiral dissymmetry (up to g = 1.70), polarization conversion around the Poincaré sphere, and circularly polarized far-field emission from a linear dipole embedded within the gap. Additionally, our in-depth analysis reveals a physical connection between the flow of spin angular momentum of light within the nanostructure and the local density of optical chirality. The insight, combined with our developed structures, offers a fresh perspective for engineering chiral nanophotonic structures and finds applications in circular dichroism spectroscopy in UV.

Conference Presentation

Citation Download Citation

Atsushi Taguchi "Enhancing UV-active chiral nanostructures with inverse topology design", Proc. SPIE PC13115, UV and Higher Energy Photonics: From Materials to Applications 2024, PC1311508 (4 October 2024); https://doi.org/10.1117/12.3028701

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