期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 18, 页码 9690-9695出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp5025813
关键词
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资金
- National Natural Science Foundation of China [11174033, 91127013]
- National Key Basic Research Special Foundation of China [2013CB632704]
We have experimentally observed around 2 orders of magnitude circular dichroism (CD) enhancement in the visible region for cysteine molecules located in the hotspots of gold nanosphere clusters. The observed plasmon-induced CD responses show a significant correlation with the chiral nature of molecules at the hotspots. These results provide a concrete experimental demonstration on the predicted chiroptical transfer and amplification effect that arises from hotspot-mediated exciton-plasmon interactions in a strongly coupled metallic nanostructure, even though the exciton-plasmon coupling works at a far off-resonant regime. Our findings suggest here that plasmonic hotspot-based CD amplifier may provide a new strategy for ultrasensitive detection and quantification of molecular chirality-a key aspect for various bioscience and biomedicine applications.
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