Abstract
Angstrom precision localization of a single nanoantenna is a crucial step towards advanced nanometrology, medicine, and biophysics. Here, we show that single nanoantenna displacements down to few angstroms can be resolved with sub-angstrom precision using an all-optical method. We utilize the tranverse Kerker scattering scheme where a carefully structured light beam excites a combination of multipolar modes inside a dielectric nanoantenna, which then, upon interference, scatters directionally into the far field. We spectrally tune our scheme such that it is most sensitive to the change in directional scattering per nanoantenna displacement. Finally, we experimentally show that antenna displacement down to 3 Å is resolvable with a localization precision of 0.6 Å.
- Received 9 April 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.193902
© 2018 American Physical Society
Physics Subject Headings (PhySH)
Focus
How to Locate a Nanoparticle with Sub-angstrom Precision
Published 9 November 2018
Laser tricks allow nanoparticle position measurements with a record 0.6-angstrom uncertainty, which will be useful in future nanotech devices.
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