Journal
NANO LETTERS
Volume 13, Issue 1, Pages 31-35Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3032263
Keywords
Gold nanoparticles; nanoparticles; optical tweezers; focus intensity; surface plasmonics; spherical aberration
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Funding
- Lundbeck Foundation
- Carlsberg Foundation
- Excellence Program at University of Copenhagen
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The photonic interactions between a focused Gaussian laser beam and a nanoscopic particle are highly dependent on exact particle location and focal intensity distribution. So far, the 3D focal intensity distribution and the preferred position of a nanoparticle confined within the focal region were only theoretically predicted. Here, we directly map the three-dimensional focal intensity distribution, quantify stable trapping positions, and prove that certain sizes of nanoparticles stably trap in front of the focus.
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