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

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Fluorescence enhancement by surface gratings.

Yu-Ju Hung, Igor I Smolyaninov, Christopher C Davis

|June 17, 2009

Summary

This summary is machine-generated.

Using a gold film with a dielectric grating significantly enhances Rhodamine 6G (R6G) fluorescence. This effect, linked to surface-plasmon-polariton excitation, shows promise for advanced sensing applications.

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Area of Science:

Optics and Photonics
Materials Science
Surface Science

Background:

Rhodamine 6G (R6G) is a widely used fluorescent dye.
Surface-plasmon-polaritons (SPPs) are collective electron oscillations on metal surfaces.
Controlling light-matter interactions at surfaces is crucial for optical applications.

Purpose of the Study:

To investigate the strong fluorescence enhancement of Rhodamine 6G (R6G).
To explore the role of dielectric gratings on gold films in modulating R6G fluorescence.
To understand the underlying mechanism involving surface-plasmon-polaritons (SPPs).

Main Methods:

Fabrication of a gold film substrate with a deposited dielectric grating.
Deposition of a Rhodamine 6G (R6G) layer onto the grating-coated gold film.
Systematic study of fluorescence enhancement by varying grating periodicity and excitation light angle of incidence.

Main Results:

Observed strong fluorescence enhancement from the R6G layer.
Demonstrated dependence of enhancement on grating periodicity and excitation angle.
Correlated enhancement with the excitation of surface-plasmon-polaritons (SPPs) on the gold film.

Conclusions:

The dielectric grating on the gold film effectively enhances R6G fluorescence.
The enhancement mechanism is attributed to the excitation of surface-plasmon-polaritons (SPPs).
This phenomenon holds potential for developing novel sensing technologies.