Chiroptical properties in rotated nanohole arrays

Xinyi Chen; Bin Ai

doi:10.1117/12.2687385

28 November 2023 Chiroptical properties in rotated nanohole arrays

Xinyi Chen, Bin Ai

Proceedings Volume 12773, Nanophotonics and Micro/Nano Optics IX; 1277317 (2023) https://doi.org/10.1117/12.2687385
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

Chiral nanohole arrays (NAs) are of significant research interest for their label-free enantiodiscrimination of biomolecules and drug compounds, even at the picogram level. This study systematically explored the impact of various parameters on chiral optical responses of NAs, enhancing our understanding of underlying mechanisms and optimization strategies. We designed dual-layer nanohole arrays with 3600 elements each, alternating Ag and Au layers. We manipulated incident angles (Δθ, θ₁) and azimuthal angles (Δφ, φ₁) using shadow sphere lithography (SSL) and introduced SiO₂ between the Au and Ag layers to enhance the response. MATLAB generated the NAs, subsequently simulated using the finite-difference time-domain (FDTD) program. Findings revealed central symmetry in circular dichroism (CD) value changes concerning Δθ and Δφ, with a more pronounced effect than variations in θ₁ and φ₁. The inclusion of SiO₂ led to a notable 118% increase in the maximum |CD|_max value, reaching 6.50° for the 100 nm sandwiched NA (SNA150) with a radius of r = 150 nm. The maximum |g-factor| of the Ag-Au SNA150 increased with the r. An efficient model categorized NAs with similar CD responses, reducing simulations to 498 based on mirror, symmetry and a 60° differential rotation property. This research provides a valuable resource for future machine learning analyses and predictions across diverse structural configurations, significantly advancing applications such as the detection of weak chiral optical molecules or proteins, compact polarization converters, and label-free chiral sensors, fostering innovation in nanohole array technology, particularly in biomedicine and optoelectronics.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xinyi Chen and Bin Ai "Chiroptical properties in rotated nanohole arrays", Proc. SPIE 12773, Nanophotonics and Micro/Nano Optics IX, 1277317 (28 November 2023); https://doi.org/10.1117/12.2687385

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

Includes PDF, HTML & Video, when available