Long- and short-ranged chiral interactions in DNA-assembled plasmonic chains

Martens, Kevin; Binkowski, Felix; Nguyen, Linh; Hu, Li; Govorov, Alexander O.; Burger, Sven und Liedl, Tim (2021): Long- and short-ranged chiral interactions in DNA-assembled plasmonic chains. In: Nature Communications, Bd. 12, Nr. 1, 2025

Abstract

Circular dichroism (CD) has long been used to trace chiral molecular states and changes of protein configurations. In recent years, chiral plasmonic nanostructures have shown potential for applications ranging from pathogen sensing to novel optical materials. The plasmonic coupling of the individual elements of such metallic structures is a crucial prerequisite to obtain sizeable CD signals. We here identify and implement various coupling entities-chiral and achiral-to demonstrate chiral transfer over distances close to 100nm. The coupling is realized by an achiral nanosphere situated between a pair of gold nanorods that are arranged far apart but in a chiral fashion using DNA origami. The transmitter particle causes a strong enhancement of the CD response, the emergence of an additional chiral feature at the resonance frequency of the nanosphere, and a redshift of the longitudinal plasmonic resonance frequency of the nanorods. Matching numerical simulations elucidate the intricate chiral optical fields in complex architectures. Here, the authors experimentally demonstrate chiral transfer over large distances up to 100 nm. They realise the coupling with an achiral nanosphere situated between a pair of distant gold nanorods arranged in a chiral fashion using DNA origami, and observe enhanced circular dichroism signals.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2041-1723
• Sprache: Englisch