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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Dispersion relation for surface plasmon polaritons on a Schottky junction.
Thamani Wijesinghe1, Malin Premaratne
1Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3800, Australia. thamani.wijesinghe@monash.edu
Optics Express
|March 29, 2012
Summary
This study derives the dispersion relation for surface plasmon polaritons (SPPs) at Schottky junctions, accounting for the space charge layer. This advances understanding of SPP modes in metal-semiconductor interfaces.
Area of Science:
- Physics
- Materials Science
- Electrical Engineering
Background:
- Conventional analysis of surface plasmon modes assumes distinct permittivity at dielectric-metal interfaces.
- This assumption fails for metal-semiconductor interfaces (Schottky junctions), which can support surface plasmon polariton (SPP) modes.
- External potentials can tune SPP behavior at Schottky junctions.
Purpose of the Study:
- To derive an analytical expression for the dispersion relation of SPP modes at Schottky junctions.
- To investigate the influence of the space charge layer on SPP characteristics.
- To provide a theoretical framework for understanding tunable plasmonics in metal-semiconductor systems.
Main Methods:
- Detailed theoretical analysis of the Schottky junction interface.
- Inclusion of the space charge layer and its effect on boundary conditions.
- Derivation of an analytical dispersion relation for SPP modes.
Main Results:
- An analytical expression for the dispersion relation of SPP modes at a Schottky junction was successfully derived.
- The analysis explicitly incorporates the space charge layer effects.
- New boundary conditions arising from the Schottky junction were established.
Conclusions:
- The derived dispersion relation accurately describes SPP modes at Schottky junctions.
- The space charge layer significantly influences SPP behavior.
- This work provides a foundation for designing novel optoelectronic devices utilizing tunable plasmonics at metal-semiconductor interfaces.
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