Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster I
Q 23.26: Poster
Tuesday, March 12, 2024, 17:00–19:00, Tent B
Influence of direct dipole-dipole interaction on the optical response of 2D materials in inhomogeneous infrared cavity fields — •Sofia Ribeiro1,2, Javier Aizpurua2, and Ruben Esteban2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Centro de Física de Materiales, Centro Mixto CSIC-UPV/EHU, Donostia, Spain
The interaction between light and matter can be strongly enhanced by using nanophotonic cavities that localize light at the nanoscale. Our work considers a 2D material formed, by a self-assembled molecular monolayer or by a single layer of a Van der Walls material, coupled to an infrared nanophotonic cavity, potentially reaching the strong coupling regime. Important effects can arise from the direct dipole-dipole interactions between the molecules, such as the emergence of new collective modes. The main effect of considering direct dipole-dipole interactions on the optical properties of the hybrid system for homogeneous or slowly varying cavity fields is the renormalization of the effective energy of the bright collective mode of the 2D material that couples with the nanophotonic mode. However, we find that, for situations of extreme field confinement, fully including the direct interactions within the 2D material becomes critical to correctly capture the optical response, with many collective vibrational states participating in the response. Further, we derive a simple analytical equation which establishes the criteria for the need of dipole-dipole interactions in the description of the hybrid system beyond the standard renormalization.
Keywords: collective effects; strong interactions; nanophotonic cavities; molecules