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Related Experiment Video

Updated: Jun 22, 2026

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

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

Published on: July 21, 2018

Bouncing surface plasmons.

Ni V Kuzmin, P F Alkemade, G W 't Hooft

|June 25, 2009

Summary

This summary is machine-generated.

We measured surface plasmon behavior at gold slits, determining their velocity and reflection properties. This reveals how surface plasmons interact with sub-wavelength structures, explaining transmission spectrum details.

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Area of Science:

Condensed matter physics
Plasmonics
Nanophotonics

Background:

Surface plasmons are collective electron oscillations at metal-dielectric interfaces.
Controlling surface plasmon propagation is crucial for nanoscale optical devices.

Purpose of the Study:

To investigate the launching, propagation, and reflection of surface plasmons at a gold-air interface with sub-wavelength slits.
To experimentally determine key parameters of surface plasmon interaction with these slits.

Main Methods:

Utilizing an interferometric cavity ring-down technique.
Creating a low-finesse optical cavity using two parallel, sub-wavelength slits on a gold film.
Analyzing surface plasmon behavior within the cavity.

Main Results:

Observed multiple bounces of surface plasmons within the cavity.
Determined surface plasmon group velocity (2.7±0.3x10^-8 m/s at 770 nm).
Measured the reflection coefficient of the slits (R ≈ 0.04) and quantified the phase jump upon reflection.

Conclusions:

The phase jump upon reflection is equivalent to the scattering phase during light-plasmon conversion.
This understanding explains fine details observed in the transmission spectrum of the double slits.
Provides insights into the fundamental interaction of surface plasmons with nanostructures.