Wang Y, Chang TC, Stoddart PR, Chang HC. Diffraction-limited ultrasensitive molecular nano-arrays with singular nano-cone scattering.
BIOMICROFLUIDICS 2014;
8:021101. [PMID:
24738011 PMCID:
PMC3971819 DOI:
10.1063/1.4869694]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 03/15/2014] [Indexed: 05/07/2023]
Abstract
Large-library fluorescent molecular arrays remain limited in sensitivity (1 × 10(6) molecules) and dynamic range due to background auto-fluorescence and scattering noise within a large (20-100 μm) fluorescent spot. We report an easily fabricated silica nano-cone array platform, with a detection limit of 100 molecules and a dynamic range that spans 6 decades, due to point (10 nm to 1 μm) illumination of preferentially absorbed tagged targets by singular scattering off wedged cones. Its fluorescent spot reaches diffraction-limited submicron dimensions, which are 10(4) times smaller in area than conventional microarrays, with comparable reduction in detection limit and amplification of dynamic range.
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