研究目的
To develop a spaser based on a quantum-dot, mesoporous-oxide, and metal structure for subwavelength light source applications.
研究成果
The study successfully developed a spaser based on a QMM structure with a relatively low threshold of approximately 39.04 kW/cm2. The MSF was found to be an effective gap layer, and the device showed potential for applications in optical integrated circuits, medical imaging, and sensing.
研究不足
The study is limited by the specific materials and structures used, and the findings may not be directly applicable to other configurations. The threshold power density for the spaser operation is relatively high, which may limit practical applications.
1：Experimental Design and Method Selection:
The study involved the fabrication of a spaser using CdS/ZnS core/shell quantum dots, a mesoporous silica film (MSF), and an Au film. Two-photon pumping was used with femtosecond laser pulses at 800 nm.
2：Sample Selection and Data Sources:
Samples were prepared with and without an Au film to study the effect of surface plasmons on quantum dot luminescence.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS), an accelerated surface-area and porosimetry system, and a femtosecond laser system. Materials included CdS/ZnS QD solution, mica substrates, and chemicals for MSF fabrication.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved depositing an Au film on mica, growing MSF on the substrate, and spin-coating QDs on the MSF/Au/mica and MSF/mica substrates.
5：Data Analysis Methods:
The luminescence intensity was measured under varying pump power densities, and numerical simulations were performed to understand the electric field distributions.
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