研究目的
To achieve unnaturally high refractive indices (n) through the soft self-assembly of polyhedral Au colloids, expanding light?matter interactions beyond the natural limits.
研究成果
The soft self-assembly of polyhedral Au colloids achieved record neff values in both resonant and nonresonant regimes, surpassing naturally available values. This method offers a versatile and highly effective route for fabricating optical metamaterials with unnaturally high refractive indices, facilitating immediate practical applications in various fields.
研究不足
The practical accessible upper limit of Re(neff) was lower than the fundamental limit due to imperfect Au NC superlattice, including distributed vertices sharpness and imperfect areal factor. The intrinsically high Im(neff) in the resonant regime was inevitable due to the Kramers?Kronig relation.
1：Experimental Design and Method Selection:
Utilized the soft self-assembly of polyhedral Au colloids to create optical metamaterials with unnaturally high refractive indices. Theoretical models and numerical simulations were employed to predict effective parameters.
2：Sample Selection and Data Sources:
Chemically synthesized highly uniform 60-85 nm Au nanocubes (NCs) and assembled them into 2D superlattices at the interface between oil and aqueous Au colloidal suspension.
3：List of Experimental Equipment and Materials:
Au nanocubes, hexane, ethanol, glass substrates, scanning electron microscopy (SEM), ellipsometry.
4：Experimental Procedures and Operational Workflow:
Synthesized Au NCs using the seed-growth method, assembled them into monolayers at the fluidic interface, transferred to solid substrates, and characterized their optical properties.
5：Data Analysis Methods:
Used the s-parameter retrieval method for numerical simulations and modal analyses to evaluate effective parameters including permittivity, permeability, and refractive index.
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