研究目的
Investigating the ultrafast sub-ablative broad-range (EUV-IR) spectral tuning of surface plasmon resonance in metals by IR femtosecond laser pulses, using aluminum as an example.
研究成果
The study demonstrates the possibility of dramatic prompt SPR red-shifting in aluminum due to prompt electronic heating and surface electron density depletion. This effect can be used for ultrafast, non-ablative all-optical tuning or switching in Al nanostructures and potentially other metallic nanostructures.
研究不足
The study is limited to aluminum and may not be directly applicable to other metals without further research. The experimental conditions are specific to the setup used, and results may vary under different conditions.
1：Experimental Design and Method Selection:
Theoretical modeling of prompt surface optics for strongly photoexcited materials and their surface plasmon-polariton (SPP) dispersion curves, and experimental multi-shot laser imprinting of surface plasmon-polaritons as large-scale regular surface ripples.
2：Sample Selection and Data Sources:
Aluminum plate was used as the sample.
3：List of Experimental Equipment and Materials:
744-nm, 100-fs laser pulses, silica lens (focal length – 50 mm), digital storage oscilloscope Tektronix
4：Experimental Procedures and Operational Workflow:
20 Multi-shot, normal-incidence stationary fs-laser exposure with N = 30 shots/spot, self-re?ection of p-polarized IR fs-laser pump pulses was calorimetrically measured at the 450-angle of incidence.
5：Data Analysis Methods:
Analysis of the prompt optical and electronic changes during the IR fs-laser photo-excitation.
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