Chiral plasmonic-dielectric coupling enables strong near-infrared chiroptical responses from helicoidal core-shell nanoparticles

Xiali Lv, Yu Tian, Fengxia Wu, Xiaoxi Luan, Fenghua Li, Zhili Shen, Guobao Xu, Kun Liu and Wenxin Niu ()
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Xiali Lv: Chinese Academy of Sciences
Yu Tian: Chinese Academy of Sciences
Fengxia Wu: Chinese Academy of Sciences
Xiaoxi Luan: Chinese Academy of Sciences
Fenghua Li: Chinese Academy of Sciences
Zhili Shen: Jilin University
Guobao Xu: Chinese Academy of Sciences
Kun Liu: Jilin University
Wenxin Niu: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Helicoid plasmonic nanoparticles with intrinsic chirality are an emerging class of artificial chiral materials with tailorable properties. The ability to extend their chiroplasmonic responses to the near-infrared (NIR) range is critically important for biomedical and nanophotonic applications, yet the rational design of such materials remains challenging. Herein, a strategy employing chiral plasmon-dielectric coupling is proposed to manipulate the chiroptical responses into the NIR region with high optical anisotropy. Through this strategy, the helicoid Au@Cu2O nanoparticles with structural chirality are designed and synthesized with tunable and enriched NIR chiroptical responses. Specially, a high optical anisotropy (g-factor) with a value of 0.35 is achieved in the NIR region, and multi-band chiroptical behaviors are observed. Spectral and electromagnetic simulations elucidate that strong coupling between chiroplasmonic core and chiral dielectric shell with high refractive index contributes to the rich and strong chiroptical responses, which are related to the interplay between various emerged and enhanced electric and magnetic multipolar resonance modes proved by multipole expansion analysis. Moreover, the helicoid Au@Cu2O nanoparticles display greater polarization rotation capability than the helicoid Au nanoparticles. This work offers mechanistic insights into chiral plasmon-dielectric coupling and suggests a general approach of creating NIR chiroplasmonic materials.

Date: 2024
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DOI: 10.1038/s41467-024-53705-4

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