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Increased Intraband Transitions in Smaller Gold Nanorods Enhance Light Emission
ACS Nano
|August 28, 2020
Summary
Smaller gold nanorods exhibit enhanced photoluminescence due to size-dependent intraband transitions. This finding offers crucial insights into metallic nanoconfined systems for plasmonic photocatalysis applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Photoinduced light emission from plasmonic nanoparticles is key for sensing, imaging, and nanothermometry.
- Emission mechanisms involve plasmon-enhanced radiative recombination of hot carriers via inter- and intraband transitions.
Purpose of the Study:
- Investigate the effect of nanoparticle size on photoluminescence in gold nanorods.
- Analyze the contributions of inter- and intraband transitions to size-dependent emission.
Main Methods:
- Systematic analysis of gold nanorods with controlled aspect ratios.
- Single-particle emission and scattering spectroscopy.
- Correlated scanning electron microscopy and electromagnetic simulations.
Main Results:
- Observed strong size-dependent quantum yields, with smaller gold nanorods showing higher yields.
- Deduced that intraband transitions predominantly drive the size dependence of photoluminescence.
- Demonstrated that Purcell factor enhancement alone does not explain emission size dependence; transition matrix elements are also critical.
Conclusions:
- Electric field confinement enhances intraband transitions, impacting emission properties.
- Provides vital insights into intraband relaxation in metallic nanoconfined systems.
- Results are directly relevant to the advancement of plasmonic photocatalysis.
