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Absorption Spectroscopy of an Individual Fano Cluster.
Mustafa Yorulmaz1, Anneli Hoggard1, Hangqi Zhao1
1Department of Chemistry, ‡Department of Physics and Astronomy, §Department of Electrical and Computer Engineering, and ∥Laboratory for Nanophotonics, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
Nano Letters
|September 27, 2016
Summary
Plasmonic Fano clusters show unique light interactions. This study reveals Fano interference is absent in absorption, crucial for optimizing hot carrier generation in these nanostructures.
Area of Science:
- Plasmonics and Nanophotonics
- Quantum Interference Phenomena
Background:
- Plasmonic clusters exhibit Fano resonances due to coupled bright and dark plasmon modes.
- These structures offer significant local electromagnetic field enhancement and potential for high hot carrier yields.
- Scattering properties of plasmonic Fano resonances are well-studied, but absorption properties remain largely unmeasured.
Purpose of the Study:
- To experimentally measure the absorption properties of individual plasmonic Fano clusters.
- To distinguish between radiative and nonradiative properties of Fano clusters.
- To verify theoretical predictions regarding Fano interference in absorption spectra.
Main Methods:
- Utilized single-particle absorption spectroscopy.
- Employed photothermal imaging techniques.
- Analyzed absorption spectra of individual Fano clusters.
Main Results:
- Directly measured the absorption spectra of individual Fano clusters for the first time.
- Verified that Fano interference, prominent in scattering, is completely absent in absorption.
- Distinguished radiative and nonradiative contributions to the optical response.
Conclusions:
- Fano interference does not manifest in the absorption spectra of plasmonic Fano clusters.
- Absorption properties are critical for understanding and optimizing hot carrier generation.
- Results provide microscopic insights into Fano interference in coupled nanoparticle systems, guiding future nanostructure design for enhanced hot carrier production.
Keywords:
Fano resonanceSurface plasmonsnear-field couplingphotothermal imagingsingle-particle spectroscopyMore Related Videos
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