期刊
NANO LETTERS
卷 12, 期 1, 页码 402-406出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl203719v
关键词
Plasmonics; optical trapping; nanoholes; optical biosensing
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
We experimentally demonstrate the optical trapping of a single bovine serum albumin (BSA) molecule that has a hydrodynamic radius of 3.4 nm, using a double-nanohole in an Au film. The strong optical force in the trap not only stably traps the protein molecule but also unfolds it The unfolding of the BSA is confirmed by experiments with changing optical power and with changing solution pH. The detection of the trapping event has a signal-to-noise ratio of 33, which shows that the setup is extremely sensitive to detect the presence of a protein, even at the single molecule level.
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