• Corpus ID: 211677250

Ultrastrong coupling of polar phonons and effective epsilon-near-zero modes in coaxial nanocavities

@article{Yoo2020UltrastrongCO,
  title={Ultrastrong coupling of polar phonons and effective epsilon-near-zero modes in coaxial nanocavities},
  author={Daehan Yoo and F. de Le'on-P'erez and In-Ho Lee and Daniel A. Mohr and Matthew Pelton and Markus B. Raschke and Joshua D. Caldwell and Luis Mart'in-Moreno and Sang‐Hyun Oh},
  journal={arXiv: Optics},
  year={2020}
}
Ultrastrong coupling (USC), where the light-matter coupling strength is comparable to the resonance frequency of the uncoupled bare system, presents new frontiers in nanophotonics. However, it has remained notoriously difficult to achieve experimentally. Here we demonstrate USC between polar phonons and mid-infrared (MIR) light in coaxial nanocavities. We achieved a level splitting of strongly coupled polaritons of 50% of the resonant frequency, enabled by the effective epsilon-near-zero (ENZ… 

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