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Molecular overlap with optical near-fields based on plasmonic nanolithography for ultrasensitive label-free detection by light-matter colocalization

Title
Molecular overlap with optical near-fields based on plasmonic nanolithography for ultrasensitive label-free detection by light-matter colocalization
Authors
Kim K.Lee W.Chung K.Lee H.Son T.Oh Y.Xiao Y.-F.Ha Kim D.Kim D.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2017
Journal Title
Biosensors and Bioelectronics
ISSN
0956-5663JCR Link
Citation
vol. 96, pp. 89 - 98
Keywords
BiosensorColocalizationPlasmonic lithographySensitivitySurface plasmon resonance
Publisher
Elsevier Ltd
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In this work, we investigate the detection sensitivity of surface plasmon resonance (SPR) biosensors by engineering spatial distribution of electromagnetic near-fields for colocalization with molecular distribution. The light-matter colocalization was based on plasmonic nanolithography, the concept of which was confirmed by detecting streptavidin biotin interactions on triangular nanoaperture arrays after the structure of the aperture arrays was optimized for colocalization efficiency. The colocalization was shown to amplify optical signature significantly and thereby to achieve detection on the order of 100 streptavidin molecules with a binding capacity below 1 fg/mm2, an enhancement by more than three orders of magnitude over conventional SPR detection. © 2017 Elsevier B.V.
DOI
10.1016/j.bios.2017.04.046
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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