Experimental Observation of Giant Chiroptical Amplification of Small Chiral Molecules by Gold Nanosphere Clusters
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- 作者：Rong-Yao Wang ; Peng Wang ; Yineng Liu ; Wenjing Zhao ; Dawei Zhai ; Xuhai Hong ; Yinglu Ji ; Xiaochun Wu ; Feng Wang ; Duan Zhang ; Wensheng Zhang ; Ruibin Liu ; Xiangdong Zhang
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：May 8, 2014
- 年：2014
- 卷：118
- 期：18
- 页码：9690-9695
- 全文大小：326K
- 年卷期：v.118,no.18(May 8, 2014)
- ISSN：1932-7455
文摘
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鈥損lasmon interactions in a strongly coupled metallic nanostructure, even though the exciton鈥損lasmon 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鈥攁 key aspect for various bioscience and biomedicine applications.