期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 108, 期 15, 页码 5976-5979出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1017962108
关键词
biosensor; nanodetector; optical microcavity
资金
- Defense Advanced Research Planning Agency
- Natural Sciences and Engineering Research Council (Canada)
We demonstrate a highly sensitive nanoparticle and virus detection method by using a thermal-stabilized reference interferometer in conjunction with an ultrahigh-Q microcavity. Sensitivity is sufficient to resolve shifts caused by binding of individual nanobeads in solution down to a record radius of 12.5 nm, a size approaching that of single protein molecules. A histogram of wavelength shift versus nanoparticle radius shows that particle size can be inferred from shift maxima. Additionally, the signal-to-noise ratio for detection of Influenza A virus is enhanced to 38:1 from the previously reported 3:1. The method does not use feedback stabilization of the probe laser. It is also observed that the conjunction of particle- induced backscatter and optical-path-induced shifts can be used to enhance detection signal-to-noise.
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