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

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 devi...

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Bibliographic Details
Published in:arXiv.org 2020-05
Main Authors: Yoo, Daehan, Fernando de León-Pérez, Lee, In-Ho, Mohr, Daniel A, Pelton, Matthew, Raschke, Markus B, Caldwell, Joshua D, Martín-Moreno, Luis, Sang-Hyun Oh
Format: Article
Language:English
Subjects:
Coupling
Infrared radiation
Lattice vibration
Maxwell's equations
Phonons
Polaritons
Resonant frequencies
Silicon dioxide
Splitting
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2003.00136