Mapping 3D Focal Intensity Exposes the Stable Trapping Positions of Single Nanoparticles

作者：Kyrsting Anders; Bendix Poul M; Oddershede Lene B^*

来源：Nano Letters, 2013, 13(1): 31-35.

DOI：10.1021/nl3032263

• Gold nanoparticles
• nanoparticles
• optical tweezers
• focus intensity
• surface plasmonics
• spherical aberration

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.

• 出版日期2013-1