研究目的
Investigating the ultrafast dynamics of the plasmonic field in individual gold bowtie nanostructures using interferometric time-resolved photoemission electron microscopy and a damped harmonic oscillator model.
研究成果
The study successfully measures the dephasing times and resonance frequencies of plasmons in gold bowtie nanostructures, providing insights into the ultrafast dynamics of plasmonic fields. The method offers a new way to accurately measure plasmon parameters and understand their temporal evolution.
研究不足
The study is limited by the spatial resolution of PEEM and the need for high vacuum conditions. The effect of inhomogeneous line broadening on the dephasing time measurement is minimized but not entirely eliminated.
1：Experimental Design and Method Selection:
The study combines interferometric time-resolved photoemission electron microscopy (ITR-PEEM) with a damped harmonic oscillator model to investigate ultrafast plasmon dynamics.
2：Sample Selection and Data Sources:
Individual gold bowtie nanostructures fabricated by electron beam lithography (EBL) on ITO-coated glass substrates.
3：List of Experimental Equipment and Materials:
A 7 fs commercial Ti:sapphire laser oscillator, PEEM for imaging, and a Mach–Zehnder interferometer for time-resolved measurements.
4：Experimental Procedures and Operational Workflow:
The bowtie nanostructures are excited by the laser, and the dynamics are probed using ITR-PEEM with phase delays adjusted to step of π/
5：Data Analysis Methods:
The photoemission signals are analyzed using a damped harmonic oscillator model to extract dephasing times and resonance frequencies.
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