研究目的
To develop reliable methods to generate multiple lattice resonances by constructing metasurfaces with plasmonic artificial molecules, which represent distinct collective responses compared with that of single nanoparticles, and to explore the hybridization between parallel and orthogonal surface lattice resonances.
研究成果
The study demonstrates that metasurfaces constructed with plasmonic artificial molecules exhibit distinct collective responses, including the excitation of multiple SLRs and their hybridization. The ability to tailor these responses and the flexible tunability of SLRs make such metasurfaces promising for designing ultrafast and compact photonic devices. The findings open new avenues for enhancing light-matter interactions and developing multiwavelength-related applications.
研究不足
The study is limited by the fabrication imperfections and the slightly divergence from a normal incidence in optical measurements, which may affect the quality factors of the resonances. Additionally, the requirement for index matching in asymmetric refractive index environments could be a constraint for practical applications.
1：Experimental Design and Method Selection:
The study involves the design and fabrication of metasurfaces composed of plasmonic trimer molecules to explore their collective optical responses. The methodology includes numerical simulations and experimental measurements to observe the excitation of multiple surface lattice resonances (SLRs) and their hybridization.
2：Sample Selection and Data Sources:
Gold nanodisk trimers with C2v and D3h point group symmetries were fabricated by electron-beam lithography (EBL). Optical responses were measured using a home-built optical setup for both randomly distributed trimers and trimer arrays.
3：List of Experimental Equipment and Materials:
Equipment includes an EBL system (Raith 150 Two), a scanning electron microscope (Zeiss, Σigma HD), and optical characterization setups with tungsten bromine lamp and spectrometers (Andor DU970P, SR500 and Princeton SPI-300, OMV-5). Materials include polymethyl methacrylate (PMMA) resist, gold, and chromium.
4：5). Materials include polymethyl methacrylate (PMMA) resist, gold, and chromium.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The fabrication process involves spin-coating PMMA on quartz substrates, EBL exposure, development, metal deposition, and lift-off. Optical measurements were conducted under normal and near-normal incidences with varying polarizations.
5：Data Analysis Methods:
The optical responses were analyzed using finite-difference time-domain (FDTD) method simulations to compare with experimental results and understand the underlying physics of SLRs and their hybridization.
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