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A study of two-photon florescence in metallic nanoshells
Mahi R Singh1,2, Patrick D Persaud1, Sergey Yastrebov2
1Department of Physics and Astronomy, The University of Western Ontario, London N6A 3K7, Canada.
Nanotechnology
|March 21, 2020
Summary
We developed a theory for two-photon fluorescence in metallic nanoshells with quantum emitters. The theory shows enhanced fluorescence due to dipole-dipole interactions, validated by experiments with gold nanoshells and quantum dots.
Area of Science:
- Plasmonics
- Quantum Optics
- Nanophotonics
Background:
- Metallic nanoshells exhibit surface plasmon resonances.
- Quantum emitters can interact with light fields.
- Two-photon fluorescence is a nonlinear optical process.
Purpose of the Study:
- To develop a theoretical framework for two-photon fluorescence in metallic nanoshells coupled with quantum emitters.
- To investigate the role of surface plasmon polaritons and dipole-dipole interactions in enhancing fluorescence.
- To compare theoretical predictions with experimental results.
Main Methods:
- Developed a theory for two-photon fluorescence considering metallic nanoshells and quantum emitters.
- Utilized many-body theory and mean-field approximation to calculate dipole-dipole interactions.
- Derived an analytical expression for two-photon fluorescence.
- Experimentally validated the theory using gold nanoshells and Cadmium-Selenium quantum dots.
Main Results:
- Surface plasmon polaritons significantly enhance the local field intensity.
- A novel dipole-dipole interaction term, induced by surface plasmon polaritons, was identified.
- Two-photon fluorescence intensity is enhanced by the presence of quantum emitters.
- Fluorescence intensity increases with the concentration of quantum emitters.
- Experimental results show good agreement with the developed theory.
Conclusions:
- The developed theory accurately describes two-photon fluorescence in metallic nanoshells with quantum emitters.
- Dipole-dipole interactions mediated by surface plasmon polaritons are crucial for fluorescence enhancement.
- Metallic nanoshells coupled with quantum emitters offer a promising platform for enhanced nonlinear optical processes.
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