Mapping 3D focal intensity exposes the stable trapping positions of single nanoparticles

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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.
Original languageEnglish
JournalNano Letters
Issue number1
Pages (from-to)31-35
Number of pages5
Publication statusPublished - 9 Jan 2013

ID: 45576358