研究目的
To compare the multiphoton photoelectron emission from a bulk sample with the photoemission from nanoparticles forming an island film.
研究成果
The study demonstrated significant differences in photoelectron emission between bulk silver samples and silver island films, particularly at wavelengths of 355 and 532 nm. The surface plasmon resonance in nanoparticles was found to significantly influence photoemission characteristics. The findings contribute to understanding the unique properties of metal nanoparticles and their potential applications.
研究不足
The study was limited by the sensitivity of the photoemission threshold determination method and the morphological changes in island films under high laser pulse energies. Additionally, the high resistance of annealed films made accurate measurements challenging.
1：Experimental Design and Method Selection:
The study involved measuring photoelectron emission from silver island films and bulk samples using a pulsed Nd:YAG laser at three wavelengths (355, 532, and 1064 nm). The experimental setup included a vacuum chamber, laser, quartz window, sample, anode, oscillograph, and power supply.
2：Sample Selection and Data Sources:
Samples were prepared by thermally evaporating silver onto sapphire or fused quartz substrates. The morphology of island films was controlled using a scanning electron microscope and spectrophotometers.
3：List of Experimental Equipment and Materials:
Equipment included a homemade vacuum setup, Nd:YAG laser, Ophir PE50BF-C pyroelectric sensor, RIGOL oscillograph, and scanning electron microscope (Merlin, Zeiss). Materials included silver of 99.99% purity and substrates.
4：99% purity and substrates.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Measurements were performed in a vacuum of at least 10-5 Torr. The laser pulse energy was varied using neutral filters, and photoelectron signals were recorded directly from the substrate.
5：Data Analysis Methods:
The dependence of photoelectron signal amplitude on laser pulse energy was analyzed for different wavelengths and sample types.
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