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

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Induced modulation instability of surface plasmon polaritons.

D A Korobko, S G Moiseev, I O Zolotovskii

|October 16, 2015

Summary

We show how modulation instability in thin plasmonic structures can create ultrashort optical pulses. This effect allows for optical field localization below 1 micron.

Area of Science:

Photonics
Condensed Matter Physics
Nanotechnology

Background:

Surface plasmon polaritons (SPPs) are electromagnetic waves coupled to electron oscillations at a metal-dielectric interface.
Modulation instability (MI) is a phenomenon where small perturbations grow exponentially in nonlinear systems, leading to wave packet formation.
Subwavelength structures offer unique optical properties due to field confinement and enhanced light-matter interactions.

Purpose of the Study:

To investigate the modulation instability (MI) of surface plasmon polariton (SPP) waves in thin layer structures.
To derive the dispersion and nonlinear properties of these subwavelength structures.
To explore the potential applications of SPP MI for optical signal processing and field localization.

Main Methods:

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Theoretical derivation of dispersion relations for SPP waves in layered subwavelength structures.
Analysis of nonlinear wave propagation and identification of conditions for modulation instability.
Numerical simulations to confirm theoretical predictions and visualize field localization.

Main Results:

Demonstration of modulation instability in SPP waves propagating in subwavelength layered structures.
Derivation of analytical expressions for the dispersion and nonlinear coefficients.
Observation of conditions favoring the generation of ultrashort pulse trains.

Conclusions:

Modulation instability of SPPs in subwavelength structures is a viable mechanism for generating ultrashort optical pulses.
The derived dispersion and nonlinear properties are crucial for understanding and controlling this phenomenon.
SPP MI offers a pathway for optical field localization at the sub-micron scale, with potential applications in nanophotonics.