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Updated: Jun 5, 2026
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Critical coupling in dissipative surface-plasmon resonators with multiple ports.
Jaewoong Yoon1, Kang Hee Seol, Seok Ho Song
1Department of Physics, Hanyang University, Seoul 133-791, Republic of Korea.
Optics Express
|December 18, 2010
Summary
We demonstrate total absorption in surface-plasmon polariton resonators by carefully tuning multiple light waves. This method offers a new way to study optical properties of localized modes.
Area of Science:
- Optics and Photonics
- Plasmonics
- Nanophotonics
Background:
- Surface-plasmon polaritons (SPPs) are light-driven electron oscillations on metal surfaces.
- Resonant absorption in SPP systems is crucial for applications like sensing and energy harvesting.
- Critical coupling occurs when internal losses equal radiation losses, ideal for maximum absorption.
Purpose of the Study:
- To theoretically investigate resonant absorption in multiple-port SPP resonators.
- To achieve total absorption by configuring coherent lightwaves near critical coupling.
- To develop analytic expressions for probing coupling characteristics of optical modes.
Main Methods:
- Theoretical analysis of multiple-port SPP resonators.
- Investigating the condition of critical coupling.
- Deriving analytic expressions for partial and total absorbance.
- Numerical simulations of a surface-plasmon resonance grating.
Main Results:
- Total absorption is achievable in multiple-port SPP systems under critical coupling.
- Analytic expressions for absorbance at each port and overall absorbance were derived.
- A sum rule was established for probing coupling characteristics.
- Simulation results validated the analytic expressions.
Conclusions:
- Configuring coherent lightwaves enables total absorption in SPP resonators.
- The derived analytic expressions provide a non-perturbing method for characterizing optical modes.
- The findings are applicable to surface-plasmon resonance gratings and similar nanophotonic structures.
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