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

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Flat-top surface plasmon-polariton modes guided by double-electrode structures.

Jaewoong Yoon, Seok Ho Song, Suntak Park

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This study reveals non-dispersive, flat-top surface plasmon-polariton modes in multi-layer waveguides. These unique modes offer uniform excitation for active media, promising advancements in nonlinear plasmonic applications.

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Area of Science:

Plasmonics
Waveguide Optics
Materials Science

Background:

Surface plasmon-polaritons (SPPs) are essential for nanoscale light manipulation.
Long-range SPPs (LRSPPs) offer extended propagation distances.
Symmetrically-coupled LRSPPs (sc-LRSPPs) in multi-layer structures present unique modal properties.

Purpose of the Study:

To characterize the frequency dependence of sc-LRSPPs in a five-layer IMIMI waveguide.
To investigate the conditions for non-dispersive, flat-top modal profiles.
To explore the potential of these modes for uniform excitation of active media.

Main Methods:

Numerical characterization of sc-LRSPP modes.
Analysis of frequency and core-thickness dependence.
Investigation of modal profiles and propagation characteristics.

Main Results:

Absence of cut-off core-thickness for sc-LRSPPs when the core insulator's refractive index is higher than the cladding.
Identification of a specific non-dispersive frequency (ωc) where modes are independent of core thickness.
Observation of consistent flat-top profiles and identical decay tails at ωc, regardless of core thickness.

Conclusions:

sc-LRSPP modes in IMIMI waveguides exhibit non-dispersive, flat-top characteristics at a specific frequency.
These properties enable highly uniform excitation of materials within the waveguide core.
The findings suggest promising applications in nonlinear plasmonics and integrated optical devices.