2018/04/30 by Ankan Bag, Martin Neugebauer, Paweł Woźniak +2 · 1 citation
Physics and Astronomy · #physics.optics
paper · pdf · doi:10.1103/physrevlett.121.193902
published as Phys. Rev. Lett. 121, 193902 (2018)
arxiv created 2018/11/12 · arxiv updated 2018/11/14
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 Angstrom is resolvable with a localization precision of 0.6 Angstrom.