Ultrafast Control of Lifetime in High Q Anisotropic Plasmon Polaritons

@misc{tirole2026ultrafast,
  title = {{Ultrafast Control of Lifetime in High Q Anisotropic Plasmon Polaritons}},
  author = {Romain Tirole and Giacomo Venturi and Emroz Khan and Lin Jing and Lin Nan and Nicola Melchioni and Andrea Mancini and Antonio Ambrosio and Andrea Alù},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.04403},
  eprint = {2609.04403},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.04403},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Ultrafast Control of Lifetime in High Q Anisotropic Plasmon Polaritons
AU  - Romain Tirole
AU  - Giacomo Venturi
AU  - Emroz Khan
AU  - Lin Jing
AU  - Lin Nan
AU  - Nicola Melchioni
AU  - Andrea Mancini
AU  - Antonio Ambrosio
AU  - Andrea Alù
PY  - 2026
DA  - 2026/09/03
PB  - arXiv
DO  - 10.48550/arxiv.2609.04403
UR  - https://arxiv.org/abs/2609.04403
AB  - Losses are a major roadblock in the technological implementation of surface plasmons at optical frequencies. The recent emergence of MoOCl2, a correlated van-der-Waals material with strongly anisotropic optical properties, offers new avenues to circumvent this limit. We report the far-field observation of high-Q surface plasmon polaritons in this material, arising from the anisotropic hybridisation of surface plasmons and dielectric modes. We then explore nonlinear pumping of intraband electrons to the conduction band in these structures, leading, contrary to intuition, to an abrupt increase in the lifetime of the polariton resonance, despite the injection of hot electrons. This counterintuitive phenomenon stems from the competition between photon and plasmon excitations in a lenticular polariton resonance, yielding a largely tuneable lifetime at ultrafast speeds.
ER  -