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arXiv · 2003.00136

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

Daehan Yoo·Fernando de León-Pérez·In-Ho Lee·Daniel A. Mohr·Matthew Pelton·Markus B. Raschke·Joshua D. Caldwell·Luis Martín-Moreno·Sang-Hyun Oh
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Abstract

Vibrational ultrastrong coupling (USC), where the light-matter coupling strength is comparable to the vibrational frequency of molecules, presents new opportunities to probe the interactions of molecules with zero-point fluctuations, harness cavity-enhanced chemical reactions, and develop novel devices in the mid-infrared regime. Here we use epsilon-near-zero nanocavities filled with a model polar medium (SiO$_2$) to demonstrate USC between phonons and gap plasmons. We present classical and quantum mechanical models to quantitatively describe the observed plasmon-phonon USC phenomena and demonstrate a splitting of up to 50% of the resonant frequency. Our wafer-scale nanocavity platform will enable a broad range of vibrational transitions to be harnessed for USC applications.

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BibTeXRIS

Daehan Yoo, Fernando de León-Pérez, In-Ho Lee, Daniel A. Mohr, Matthew Pelton, Markus B. Raschke, Joshua D. Caldwell, Luis Martín-Moreno, Sang-Hyun Oh. 2020-02-29. Ultrastrong plasmon-phonon coupling via epsilon-near-zero nanocavities. https://doi.org/10.1038/s41566-020-00731-5

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