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

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Optical control of fluorescence through plasmonic eigenmode extinction.

Xiaoying Xu¹, Shih-Che Lin², Quanshui Li³

¹Materials Sciences and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Scientific Reports

|May 1, 2015

Summary

We demonstrate optical control of cadmium selenide (CdSe) quantum dot fluorescence using nanostructured gold films. This method tunes and enhances light emission by optically altering the gold film

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Published on: November 21, 2019

Area of Science:

Nanophotonics
Quantum Dot Optics
Plasmonics

Background:

Quantum dots (QDs) are semiconductor nanocrystals with tunable optical properties.
Controlling QD fluorescence is crucial for applications in imaging and sensing.
Plasmonic nanostructures can enhance light-matter interactions.

Purpose of the Study:

To introduce optical control of CdSe QD fluorescence yield.
To investigate plasmon-induced structural changes in gold films for fluorescence modulation.
To demonstrate wavelength- and polarization-dependent control of QD emission.

Main Methods:

Utilized random semicontinuous nanostructured gold films.
Investigated coupling between CdSe QDs and gold nanostructures.
Employed optical extinction to selectively excite eigenmodes in the gold films.
Analyzed wavelength- and polarization-dependent fluorescence emission.

Main Results:

Achieved optical control of QD fluorescence yield via plasmon-induced structural changes.
Demonstrated significant enhancement of fluorescent emission.
Showcased control over the fluorescent emission spectrum by tuning optical extinction.
Established wavelength- and polarization-dependent coupling between QDs and gold films.

Conclusions:

Optical modulation of nanostructure enables versatile functionality in a single sample.
This approach provides a pathway for in situ control over QD fluorescence spectra.
The findings offer new possibilities for advanced optical devices and sensing applications.