Exploring chiral nanogap structures using topology optimization

Atsushi Taguchi

doi:10.1117/12.3027919

30 September 2024 Exploring chiral nanogap structures using topology optimization

Atsushi Taguchi

Author Affiliations +

Proceedings Volume PC13126, Molecular and Nanophotonic Machines, Devices, and Applications VII; PC1312608 (2024) https://doi.org/10.1117/12.3027919
Event: Organic Photonics + Electronics, 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 designing chiral nanophotonic structures for better control of chiral molecules using light.

Conference Presentation

Citation Download Citation

Atsushi Taguchi "Exploring chiral nanogap structures using topology optimization", Proc. SPIE PC13126, Molecular and Nanophotonic Machines, Devices, and Applications VII, PC1312608 (30 September 2024); https://doi.org/10.1117/12.3027919

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE