Nano Letters· 2026Q1
High Refractive Index Silver Nanoparticle Metamaterials Approaching Fundamental Bounds
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- 2026year
Short summary
Silver nanoparticle assemblies achieve refractive indices up to 10.3, approaching fundamental performance limits for high-index, low-loss optical metamaterials.
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Key points
- Synthesized silver nanoparticle monolayers with diameters of 17-66 nm.
- Achieved size-dependent refractive indices up to 10.3 with a low-loss region.
- Developed an analytical model linking optical constants to interparticle gap.
- Experimental assemblies approach two-thirds of the theoretical high-index–low-loss limit for silver composites.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Dense assemblies of metal nanoparticles offer a scalable route to high-index optical metamaterials, yet their collective response and loss mechanisms remain poorly understood. We synthesize quasi-spherical Ag nanoparticles with diameters ranging from 17 to 66 nm and assemble them into closely-packed monolayers. These films exhibit size-dependent refractive indices reaching a maximum of 10.3 with a low loss region emerging on the red shoulder of the resonance. We introduce a compact analytical model that quantitatively reproduces the measured optical constants and identifies the interparticle gap as the lever controlling the achievable index and loss. We compute Bergman-Milton fundamental limits, finding that our best assemblies reach two-thirds of the high-index–low-loss Pareto frontier for silver/polystyrene composites of arbitrary microstructure with the remaining samples approaching within a factor of 1.7–4. Together, experiment and theory establish silver nanoparticle assemblies as a tunable platform approaching fundamental bounds and define pathways for further performance gains.
The authors' abstract, as published at the source. Nano Letters, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science