@article{12255,
  author = {Daehan Yoo and Fernando de León-Pérez and Matthew Pelton and In-Ho Lee and Daniel Mohr and Markus Raschke and Joshua Caldwell and Luis Martín-Moreno and Sang-Hyun Oh},
  title = {Ultrastrong plasmon–phonon coupling via epsilon-near-zero nanocavities},
  abstract = {Vibrational ultrastrong coupling, where the light–matter coupling strength is comparable to the vibrational frequency of molecules, presents new opportunities to probe the interactions between molecules and zero-point fluctuations, harness cavity-modified chemical reactions and develop novel devices in the mid-infrared spectral range. Here we use epsilon-near-zero nanocavities filled with a model polar medium (SiO2) to demonstrate ultrastrong coupling between phonons and gap plasmons. We present classical and quantum-mechanical models to quantitatively describe the observed plasmon–phonon ultrastrong coupling phenomena and demonstrate a modal splitting of up to 50% of the resonant frequency (normalized coupling strength η > 0.25). Our wafer-scale nanocavity platform will enable a broad range of vibrational transitions to be harnessed for ultrastrong coupling applications.},
  year = {2020},
  journal = {Nature Photonics},
  volume = {15},
  pages = {125–130},
  month = {2020-12},
  isbn = {1749-4893},
  url = {https://doi.org/10.1038/s41566-020-00731-5},
  doi = {10.1038/s41566-020-00731-5},
}