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Retardation-induced plasmonic blinking in coupled nanoparticles.

Holger Fischer¹, Olivier J F Martin

¹Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology, Lausanne, Switzerland. holger.fischer@epfl.ch

|February 3, 2009

Summary

Retardation causes interference in coupled plasmonic nanoparticles. Periodic intensity blinking occurs in the first particle due to inclined illumination, impacting near-field measurements.

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Area of Science:

Plasmonics and Nanophotonics
Optical Interference Phenomena

Background:

Radiatively coupled plasmonic nanoparticles exhibit complex optical behaviors.
Understanding interference effects is crucial for nanoscale light manipulation.

Purpose of the Study:

To investigate interference effects arising from retardation in coupled plasmonic nanoparticles.
To analyze the influence of illumination angle and particle separation on field localization and intensity variations.

Main Methods:

Theoretical study of two radiatively coupled plasmonic nanoparticles.
Analysis of optical field enhancement and attenuation under inclined illumination through a glass substrate.
Examination of intensity variations as a function of particle separation and illumination angle.

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Main Results:

Observed periodic intensity blinking localized at the first nanoparticle.
Demonstrated a nonsymmetric blinking phenomenon, with minimal effect on the second nanoparticle.
Identified optimal illumination angles where optical retardation matches particle distance, maximizing the effect.

Conclusions:

Retardation-induced interference leads to particle-specific plasmonic blinking.
The observed phenomenon has significant implications for high-resolution near-field optical measurements.
Tailoring illumination conditions can control plasmonic interference for sensing applications.