研究目的
Investigating the localized nanoresonator modes in plasmonic microcavities formed by hexagonal boron nitride crystals embedded in noble metals with deposited Au nanoparticles.
研究成果
The study identifies a new microcavity nanoresonator mode excited only for TM polarization at specific angles, arising from multiple reflections between the scatterer and Au mirror. These modes are crucial for understanding the coupling of nanoparticles with materials like transition metal dichalcogenides and are promising for angle- and polarization-sensitive optical devices.
研究不足
The study is limited by the morphology of the nanoparticles and the microcavity, which may affect the scattering intensities and mode positions. The model does not fully account for measured scattering intensities, suggesting additional factors like Fano resonances may be at play.
1：Experimental Design and Method Selection:
The study involves the fabrication of planar Fabry-Perot half-microcavities using submicron-thick hexagonal boron nitride (hBN) crystals embedded in noble metals and depositing Au nanoparticles on top. The methodology includes dark-field and bright-field scattering spectroscopy to analyze the nanoresonator modes.
2：Sample Selection and Data Sources:
High-quality hBN crystals are used to form microcavities, with Au nanoparticles deposited from solution. Data is collected from individual nanoparticles on different terraces of the hBN crystals.
3：List of Experimental Equipment and Materials:
Includes a microscope with a 100× objective, numerical aperture NA 0.8, for both dark-field and bright-field illumination. Materials include hBN crystals, Au nanoparticles, and noble metals for embedding.
4：8, for both dark-field and bright-field illumination. Materials include hBN crystals, Au nanoparticles, and noble metals for embedding.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The process involves template exfoliation of hBN crystals, deposition of Au nanoparticles, and spectroscopic analysis under varying angles of illumination and polarization.
5：Data Analysis Methods:
The analysis involves comparing dark-field scattering with reflection spectroscopies, using generalized Mie theory to understand the scattering and extinction spectra.
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