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Related Experiment Video

Updated: Jan 24, 2026

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

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

Published on: July 21, 2018

Directional coupling of surface plasmon polaritons at complementary split-ring resonators.

Yongsop Hwang¹, Jin-Kyu Yang^2,3

¹Institute of Application and Fusion for Light, Kongju National University, Cheonan, 31080, South Korea.

Scientific Reports

|May 16, 2019

Summary

We developed a complementary split-ring resonator (CSRR) for directional coupling of surface plasmon polaritons (SPPs). This method enables one-way SPP propagation, crucial for miniaturizing plasmonic devices.

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Area of Science:

Plasmonics
Nanophotonics
Electromagnetics

Background:

Surface plasmon polaritons (SPPs) are light-matter interactions at metal-dielectric interfaces.
Controlling SPP propagation is essential for nanoscale optical circuits.

Purpose of the Study:

To propose and investigate a complementary split-ring resonator (CSRR) for directional coupling of SPPs.
To demonstrate one-way propagation of SPPs using polarization control.

Main Methods:

Numerical simulation using the finite-difference time-domain (FDTD) method.
Theoretical analysis based on cylindrical wave propagation and Hankel functions.

Main Results:

The CSRR enables directional coupling of SPPs based on incident light polarization.
One-way propagation achieved with 30x power difference between directions.
Simulated coupling efficiency of 18.2% for an array of CSRRs.

Conclusions:

The proposed CSRR offers an effective method for directional SPP coupling.
This technique is promising for the miniaturization of photonic and plasmonic devices.