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MM: Fachverband Metall- und Materialphysik

MM 17: Nanomaterials

MM 17.9: Vortrag

Dienstag, 2. April 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