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Spatial Variations in Femtosecond Field Dynamics within a Plasmonic Nanoresonator Mode
Matthias Hensen1, Bernhard Huber1, Daniel Friedrich2
1Institut für Physikalische und Theoretische Chemie , Universität Würzburg , Am Hubland, 97074 Würzburg , Germany.
Nano Letters
|June 11, 2019
Summary
Researchers observed spatial variations in plasmonic resonator properties using time-resolved photoemission electron microscopy. These variations, explained by quasinormal modes, reveal crosstalk between adjacent resonator modes, impacting light-matter interactions.
Area of Science:
- Plasmonics and Nanophotonics
- Ultrafast Spectroscopy
- Surface Science
Background:
- Plasmonic resonators support discrete modes with localized electromagnetic hot-spots.
- These hot-spots enhance light-matter interactions, crucial for various nanoscale applications.
- Understanding local field dynamics is key to controlling plasmonic behavior.
Purpose of the Study:
- To investigate the local field dynamics within individual hot-spots of a nanoslit plasmonic resonator.
- To explore spatial variations in resonator properties like Q-factor and resonance frequency.
- To elucidate the underlying mechanisms causing these observed local differences.
Main Methods:
- Utilized time-resolved photoemission electron microscopy (TR-PEEM) with a spatial resolution of ~12 nm.
- Employed ultrashort (20 fs) laser pulses from a noncollinear optical parametric amplifier (NOPA) for excitation.
- Analyzed photoelectron emission signals to probe local field dynamics.
Main Results:
- Detected apparent spatial variations in the Q-factor and resonance frequency of individual hot-spots.
- Observed these properties, typically considered global, exhibiting local differences within a single resonator mode.
- Identified crosstalk between adjacent resonator modes as the cause for these local variations.
Conclusions:
- Quasinormal mode theory successfully explains the observed local variations in resonator properties.
- Crosstalk between adjacent modes significantly influences local field dynamics in plasmonic resonators.
- Findings are crucial for advancing time-domain studies of plasmon-mediated strong light-matter coupling under ambient conditions.
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