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Light Emission from Plasmonic Nanostructures Enhanced with Fluorescent Nanodiamonds
Jingyi Zhao1, Yuqing Cheng1, Hongming Shen1
1State Key Laboratory for Mesoscopic Physics & Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing, 100871, China.
Scientific Reports
|February 28, 2018
Summary
This study shows surface-enhanced fluorescence (SEF) is a mutual process, where fluorescent emitters enhance gold nanoparticle light emission. The dielectric antenna effect significantly boosts nanoparticle light emission in hybrid systems.
Area of Science:
- Nanophotonics
- Plasmonics
- Quantum Optics
Background:
- Surface-enhanced fluorescence (SEF) typically involves plasmonic nanostructures enhancing fluorescent emitter light.
- The reciprocal enhancement of plasmonic nanostructure emission by fluorescent emitters is less explored.
Purpose of the Study:
- To investigate the mutual enhancement in a hybrid system of fluorescent nanodiamond and gold nanoparticles.
- To analyze the influence of coupling configuration on light emission properties.
- To model the interaction and elucidate the underlying enhancement mechanisms.
Main Methods:
- Step-by-step assembly of a hybrid nanodiamond-gold nanoparticle system using atomic force microscopy.
- In situ optical measurements of light emission intensity, spectral shape, and lifetime.
- Theoretical modeling based on a quantized optical cavity and dielectric antenna effect.
Main Results:
- Demonstrated that fluorescent nanodiamonds enhance gold nanoparticle anti-Stokes emission.
- Observed that light emission properties are dependent on the coupling configuration.
- Theoretical calculations indicated the dielectric antenna effect is a primary contributor to nanoparticle emission enhancement.
Conclusions:
- Surface-enhanced fluorescence (SEF) is a mutually enhancing process between emitters and plasmonic nanostructures.
- Hybrid systems should be treated as a single entity for analyzing and optimizing surface-enhanced spectroscopy.
- Dielectric antenna effects play a crucial role in enhancing nanoparticle emission.
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