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Updated: Jan 8, 2026
07:39
Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
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Cavity-mediated coupling between local and nonlocal modes in Landau polaritons
Sae R Endo1,2, Dasom Kim3, Shuang Liang4
1Smalley-Curl Institute, Rice University, Houston, TX 77005, USA.
Nanophotonics (Berlin, Germany)
|December 22, 2025
Summary
Researchers demonstrate nonlocal multimode coupling in a Landau polariton system, enabling control over light-matter interactions. This breakthrough in ultrastrong coupling (USC) opens new avenues for quantum technologies.
Area of Science:
- Cavity quantum electrodynamics
- Solid-state physics
- Quantum optics
Background:
- The ultrastrong coupling (USC) regime offers novel phenomena in cavity quantum electrodynamics.
- Controlling light-matter interactions via cavity-mediated correlations between local and nonlocal excitations is of significant interest.
- Experimental evidence for these nonlocal interactions has been lacking.
Purpose of the Study:
- To demonstrate nonlocal multimode coupling in a Landau polariton system.
- To investigate cavity-mediated interactions between zero- and finite-momentum matter modes.
- To explore new methods for controlling light-matter interactions across space.
Main Methods:
- Utilizing slot cavities with subwavelength mode volumes to excite finite-momentum matter modes.
- Performing terahertz time-domain magnetospectroscopy.
- Analyzing experimental results with the multimode Hopfield model and finite-element simulations.
Main Results:
- Demonstrated simultaneous interaction of cavity photons with zero-momentum cyclotron resonance and finite-momentum magnetoplasmons in GaAs.
- Observed a clear splitting of the upper-polariton branch due to hybridization.
- Confirmed USC of cyclotron resonance and strong coupling of magnetoplasmon modes to the cavity field.
Conclusions:
- Established a pathway for engineering multimode light-matter interactions in the USC regime.
- Successfully demonstrated nonlocal coupling involving zero- and finite-momentum matter modes.
- Provided experimental evidence for previously elusive cavity-mediated nonlocal interactions.
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