DNA Origami Directed Assembly of Gold Bowtie Nanoantennas for Single‐Molecule Surface‐Enhanced Raman Scattering |
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| Authors: | Pengfei Zhan Te Wen Zhen‐gang Wang Yingbo He Jia Shi Ting Wang Prof. Xinfeng Liu Prof. Guowei Lu Prof. Baoquan Ding |
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| Affiliation: | 1. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, ZhongGuanCun, Beijing, China;2. State Key Laboratory for Mesoscopic Physics & Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing, China;3. University of Chinese Academy of Sciences, Beijing, P. R. China |
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| Abstract: | Metallic bowtie nanoarchitectures can produce dramatic electric field enhancement, which is advantageous in single‐molecule analysis and optical information processing. Plasmonic bowtie nanostructures were successfully constructed using a DNA origami‐based bottom‐up assembly strategy, which enables precise control over the geometrical configuration of the bowtie with an approximate 5 nm gap. A single Raman probe was accurately positioned at the gap of the bowtie. Single‐molecule surface‐enhanced Raman scattering (SM‐SERS) of individual nanostructures, including ones containing an alkyne group, was observed. The design achieved repeatable local field enhancement of several orders of magnitude. This method opens the door on a novel strategy for the fabrication of metal bowtie structures and SM‐SERS, which can be utilized in the design of highly‐sensitive photonic devices. |
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| Keywords: | bowtie nanostructures DNA assembly plasmonic resonance single-molecule studies surface-enhanced Raman spectroscopy |
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