2022-09-21 11:00:00

Dominik Rattenbacher Max Planck Institute for the Science of Light, Staudtstraße 2, 91058 Erlangen, Germany

On-Chip Quantum Optics and Sensing with Organic Molecules

In my talk I will introduce polycyclic aromatic dye molecules as two-level quantum emitters and will review the recent advances of our group in controlling and manipulating their light-matter interaction by shaping their nanoenviroment. A special focus will be given on my PhD work dealing with the coupling of organic molecules to chip-based nanophotonic circuits. Here, I will discuss the coupling of individual molecules to one-dimensional subwavelength waveguides and the prospects of realizing coupled emitter ensembles by DC-Stark tuning of the molecular resonances. Furthermore, I will demonstrate that the sensitivity of the molecules to electric fields can be used to sense fields in their nanoenviroment. The specific example will be weak charge fluctuations in a gallium phosphide waveguide. I will present a series of experiments that reveal the spatial and temporal correlations of the electric field and show that the temporal correlation scales proportionally with the optical intensity. In the quest for reaching near deterministic coupling efficiencies, I will introduce ring- and disc-resonators and show the Purcell-enhanced coupling of single molecules to these structures. With our most recent design, a 6 µm diameter disk resonator, I will demonstrate a resonator finesse up to 250 (Q=16000), leading to coupling efficiency of 75%. Furthermore, I will show the controlled manipulation and tuning of molecular resonances via nearby microelectrodes and the simultaneous coupling of two individual molecules to the two counter propagating modes of the disc.

Speaker's Bio

Dominik Rattenbacher studied physics in the "Physics Advanced Program" at the Universities of Erlangen and Regensburg from 2013 to 2018. After a research stay at the Ultrafast and Attosecond Science group of Prof. Hans Jakob Wörner at ETH Zurich, he did his Master thesis on "Spectroscopic investigation of two molecules coupled via a dielectric waveguide" in the Division of Vahid Sandoghdar at the Max Planck Institute for the Science of Light. His PhD work is a direct continuation of this project and aims at coupling several molecules efficiently via nanophotonic circuits.