Over the last decade, structured light has become an important tool in the field of nano-optics, nano-photonics and beyond [1]. Especially when confined spatially, electromagnetic fields exhibit complex three-dimensional distributions. These tailored fields can be utilized to excite individual nanoparticles, giving rise to a variety of different applications, ranging from single-particle spectroscopy [2], nanoscale traffic control [3-5], nano-metrology [6-8] and beyond. In the context of nano-metrology, we have recently introduced a scheme based on structured light-nanoparticle interactions, resulting in controlled directional scattering [6-8]. We take advantage of directional interference of dipolar emission of a nanoparticle, a phenomenon similar to the so-called Kerker scattering (or Huygens dipole) [9-11]. However, in contrast to conventional Kerker scattering that gives rise to pronounced forward or backward signals [10,11], the excitation with three-dimensional fields can result in a lateral directionality or transverse Kerker scattering [5-8] (see Fig.). The strength of this directionality is directly linked to the position of a nanoparticle with respect to the highly confined excitation field. Hence, it can act as a ruler to measure the particle position via the far-field scattering. By using this technique, the position of a nanoparticle can be experimentally retrieved on a sub-Angstrom length-scale [7]. The scheme paves the way for the development of novel nano-metrology schemes, precise and fast stabilization of positioning stages, nano-scale light-routing, and more.
In this presentation, we will introduce the general concept of transverse Kerker based localization. Furthermore, we will discuss current activities aiming for hi-speed tracking, first steps towards the localization of arbitrarily shaped nanoparticles as well as the utilization of a novel detector platform for nano-metrology.
References:
[1] H. Rubinsztein-Dunlop et al., “Roadmap on structured light,” Journal of Optics 19, 013001 (2017).
[2] P. Wozniak and P. Banzer, New Journal of Physics 23, 103013 (2021)
[3] M. Neugebauer et al., Nano Letters 14, 2546–2551 (2014)
[4] M.F. Picardi et al., Physical Review Letters 120 (11), 117402 (2018).
[5] S. Nechayev et al., Physical Review A 99(4), 041801 (2019).
[6] M. Neugebauer et al., Nature Communications 7, 11, 286 (2016).
[7] A. Bag et al., Physical Review Letters 121, 193902 (2018).
[8] A. Bag, M. Neugebauer, U. Mick, S. Christiansen, S. A Schulz, P. Banzer, Nature Communications 11, 2915 (2020)
[9] I. Kuznetsov et al., Scientific Reports 2, 492 (2012).
[10] M. Decker et al., Advanced Optical Materials 3, 813–820 (2015).
[11] M. Kerker et al., Journal of the Optical Society of America 73, 765 (1983).
Der Vortrag kann in PRÄSENZ im HS 05.01 oder virtuell via uniMEET mit folgendem Link besucht werden:
https://unimeet.uni-graz.at/b/pus-exy-jx7
Interessent*in sind unter der Einhaltung der aktuell gültigen Covid-19 Regeln herzlich willkommen.
Eine Programmübersicht zum 653.122 Dissertant*innenseminar (Experimentalphysik und Festkörperphysik) finden Sie hier.