Ultrastrong light-matter coupling in materials: From plasmonic supercrystals to ferroelectrics
DIPC Seminars
- Speaker
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Stephanie Reich, Freie Universitaet Berlin, Germany
- When
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2022/03/28
14:00 - Place
- Donostia International Physics Center
- Add to calendar
-
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Most materials interact weakly with light, which is why we treat light as an
external perturbation. There has been growing interest in systems where light-
matter interaction is much stronger so that it becomes comparable to other
characteristic energies of the system. In the regime of ultrastrong and deep
strong coupling the coupling energy approaches the bare excitation energy of a
material. This regime leads to exotic effects like the population of the
ground state with virtual photons, phase transitions, and a breakdown of the
Purcell effect. Here I discuss how extreme light-matter coupling is
systematically achieved in materials. I introduce densely packed supercrystals
of gold nanoparticles that have coupling energies in the visible spectral
range. I present measurements of their plasmon-polaritons and confirm the
breakdown of the Purcell effect. Such supercrystals may also be used to place
molecules in an extreme electromagnetic environment. If time permits, I
discuss a universal model to treat light-matter coupling in systems of
different dimension and the strongest light-matter coupling we can reasonably
expect to achieve in materials.
Host: Javier Aizpurua
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