期刊
NANO LETTERS
卷 12, 期 4, 页码 1923-1927出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl204378r
关键词
Gold nanoparticle; optical sorting; optical manipulation; counter-propagating geometry; evanescent field; plasmon resonance
类别
资金
- U.K. Engineering and Physical Sciences Research Council
- EPSRC [EP/I004602/1]
- EPSRC [EP/I004602/1, EP/G029733/1, EP/F020589/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I004602/1, EP/G029733/1, EP/F020589/1] Funding Source: researchfish
We present a generic technique allowing size-based all-optical sorting of gold nanoparticles. Optical forces acting on metallic nanoparticles are substantially enhanced when they are illuminated at a wavelength near the plasmon resonance, as determined by the particle's geometry. Exploiting these resonances, we realize sorting in a system of two counter-propagating evanescent waves, each at different wavelengths that selectively guide nanoparticles of different sizes in opposite directions. We validate this concept by demonstrating bidirectional sorting of gold nanoparticles of either 150 or 130 nm in diameter from those of 100 nm in diameter within a mixture.
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