Induction and amplification of circular dichroism by coupling chiral molecules to achiral plasmonic nanostructured gold films
Source abstract
Abstract
We present a study on the chiroptical activity modulation of plasmon–molecule hybrids composed of natural chiral molecules and nanostructured gold films. The deposition of chiral riboflavin (vitamin B2) molecules onto nanostructured gold films with varied sputtering time leads to a significant enhancement of extinction and a band shift in the localized surface plasmon resonances, along with fine tuning of the percolating threshold. More interestingly, the circular dichroism (CD) signals of riboflavin are remarkably amplified via plasmonic coupling. Furthermore, this interaction induces a new CD signal emerging around the extinction valley of the gold films in the hybridized system, which is caused by a long-range electromagnetic coupling both with localized surface plasmons and propagating surface plasmon polaritons. The chiral modulation of plasmonic coupling with natural chiral molecules underscores its promising application in the fields of chiral sensing and surface-enhanced spectroscopy.
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Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Metamaterials and Metasurfaces Applications · Plasmonic and Surface Plasmon Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Artificial Micro- and Nano-Structures of the Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory, School of Physics and Technology, Wuhan University 1 , Wuhan 430072,
Department of Physics, State Key Laboratory of Quantum Functional Materials, and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology (SUSTech) 2 , Shenzhen 518055,
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China
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