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MM: Fachverband Metall- und Materialphysik
MM 17: Nanomaterials
MM 17.9: Talk
Tuesday, April 2, 2019, 12:30–12:45, H46
The Effect of Molecular Orientation on the Plasmon Resonance of Metal Nanostructures — •Thomas Purcell1, Shira Yochelis2, Yossi Paltiel2, and Tamar Seideman1 — 1Chemistry Department, Northwestern University, Evanston, IL, USA — 2Applied Physics Department and the Center for Nanoscience and Nanothechnology, Hebrew University of Jerusalem, Jerusalem, Israel
Plasmon-based nanophotonics is becoming increasingly popular, in part because of its ability to improve the efficiency of optical devices by enhancing electromagnetic fields near plasmonic hot-spots~[1]. To fully describe the plasmonic enhancement in these devices, contributions from both the sensitizers and the nanostructures need to be accounted for. Modeling the coupling between those two contributions, including the often decisive alignment between the sensitizers' and plasmon's dipole moments, remains an open challenge. By modifying the finite-difference time-domain method we develop a continuous model for a layer of molecular dipoles with an arbitrary orientation relative to a nanoparticle's surface, and study the coupled system's optical~[2] and chiroptical~[3] response. We demonstrate how the molecules alter the plasmon resonance of nanostructures and change the coupling between the plasmon and a colloidal quantum dot monolayer. Finally we include chiroptical effects to get a better understanding how the molecular dipole orientation affects chiral imprinting inside nanoparticles.
[1] T. Purcell, et al., J. Phys. Chem., 120, 21837 (2016)
[2] T. Purcell, et al., J. Phys. Chem., 122, 16901 (2018)
[3] T. Purcell and T. Seideman, ACS Photonics, Accepted