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Ultrastrong plasmon-phonon coupling via epsilon-near-zero nanocavities

Yoo, Daehan; de Leon-Perez, Fernando; Pelton, Matthew; Lee, In-Ho; Mohr, Daniel A.; Raschke, Markus B.; Caldwell, Joshua D.; Martin-Moreno, Luis; Oh, Sang-Hyun

NATURE PHOTONICS
2020
VL / 15 - BP / 125 - EP / +
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 eta > 0.25). Our wafer-scale nanocavity platform will enable a broad range of vibrational transitions to be harnessed for ultrastrong coupling applications.

AccesS level

Green submitted, Green accepted

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