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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Breaking Surface-Plasmon Excitation Constraint via Surface Spin Waves.

H Y Yuan^1,2, Yaroslav M Blanter²

¹Institute for Advanced Study in Physics, <a href="https://ror.org/00a2xv884">Zhejiang University</a>, 310027 Hangzhou, China.

Physical Review Letters

|October 25, 2024

Summary

We demonstrate effective excitation of transverse-electric (TE) surface plasmons in 2D materials using a hybrid structure. This breakthrough enables enhanced light-matter interactions for future plasmonic and spintronic devices.

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Area of Science:

Condensed matter physics
Materials science
Optoelectronics

Background:

Surface plasmons in two-dimensional (2D) electron systems are crucial for light-matter applications.
Exciting transverse-electric (TE) surface plasmons in 2D materials is challenging due to energy-momentum conservation issues.

Purpose of the Study:

To demonstrate effective excitation and manipulation of TE surface plasmons in the gigahertz to terahertz regime.
To explore the use of hybrid structures for enhanced plasmonic properties.

Main Methods:

Utilizing a hybrid dielectric, 2D material, and magnet structure.
Investigating the role of surface spin waves in plasmon excitation.
Analyzing reflection spectra to observe plasmon excitation dips.

Main Results:

TE surface plasmons were effectively excited and manipulated in the gigahertz-terahertz range.
Surface spin waves provided additional freedom for plasmon excitation, enhancing electric fields.
Plasmon excitation was observed as a dip in the reflection spectrum.
Dip characteristics were controllable via electric gating and magnetic fields.

Conclusions:

The hybrid structure overcomes challenges in TE surface plasmon excitation in 2D materials.
This work integrates low-dimensional physics, plasmonics, and spintronics.
It opens new avenues for developing novel plasmonic and spintronic devices.