Plasmonic Toroidal Metamolecules Assembled by DNA Origami
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- 作者：Maximilian J. Urban ; Palash K. Dutta ; Pengfei Wang ; Xiaoyang Duan ; Xibo Shen ; Baoquan Ding ; Yonggang Ke ; Na Liu
- 刊名：Journal of the American Chemical Society
- 出版年：2016
- 出版时间：May 4, 2016
- 年：2016
- 卷：138
- 期：17
- 页码：5495-5498
- 全文大小：325K
- 年卷期：0
- ISSN：1520-5126
文摘
We show hierarchical assembly of plasmonic toroidal metamolecules that exhibit tailored optical activity in the visible spectral range. Each metamolecule consists of four identical origami-templated helical building blocks. Such toroidal metamolecules show a stronger chiroptical response than monomers and dimers of the helical building blocks. Enantiomers of the plasmonic structures yield opposite circular dichroism spectra. Experimental results agree well with the theoretical simulations. We also show that given the circular symmetry of the structures s distinct chiroptical response along their axial orientation can be uncovered via simple spin-coating of the metamolecules on substrates. Our work provides a new strategy to create plasmonic chiral platforms with sophisticated nanoscale architectures for potential applications such as chiral sensing using chemically based assembly systems.