Promotionsvortrag Physik: „Transverse Kerker Scattering for Angstrom Localization of a Nanoparticle“

Ankündigung des Promotionsvortrags von: Herrn Ankan Bag

Ångström precision localization of a single nanoantenna is a crucial step towards advanced nano-metrology, medicine, and biophysics. Here, we show that single nanoantenna displacements down to a few Ångström can be resolved with sub-Ångström precision using an all-optical method. We use transverse Kerker scattering scheme where a carefully structured light beam excites a combination of multipolar modes inside a dielectric nanoantenna, which then scatters directionally. With an appropriate choice of beam and nanoantenna, we achieve a high sensitivity of such di-rectional scattering per nanoantenna displacement, and show that displacements down to 3 Å are resolvable with a localization precision of 0.6 Å. This is followed by an on-chip integration of the localization scheme where we show a prototype of an integrated displacement sensor in which the position of the antenna relative to the excitation field determines its directional coupling into a six-way crossing of photonic crystal waveguides. And we experimentally demonstrate a position accuracy below λ/300 at room temperature and ambient conditions.

(Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.