Internal electric field densities of metal nanoshells.
← Research streamUsing Mie theory and the quasistatic approximation, the authors calculate internal field patterns for gold nanoshells and compare them with homogeneous spheres and metallic rings. They report that peak field enhancement in metallic shells occurs perpendicular…
Study snapshot
Abstract
The internal field patterns for gold shells filled with the same material as the surrounding medium are calculated with Mie theory and in the quasistatic approximation and their properties compared to the response of homogeneous spheres and metallic rings. One major difference between the sphere and shell case is that the areas of highest field enhancement in metallic shells are located perpendicular to the incident polarization, whereas for metallic spheres they are along the polarization direction. Recent results based on the discrete dipole approximation (DDA) are shown to be misleading, which might be due to the use of a too coarse grid size. We also show that the type of resonance and the associated internal field pattern (low or high energy) has a strong impact on the external fields.
AI evidence extraction
Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.
Main findings
Using Mie theory and the quasistatic approximation, the authors calculate internal field patterns for gold nanoshells and compare them with homogeneous spheres and metallic rings. They report that peak field enhancement in metallic shells occurs perpendicular to the incident polarization, whereas for metallic spheres it occurs along the polarization direction, and that resonance type (low vs high energy) strongly affects external fields. They also state that recent DDA-based results are misleading, possibly due to overly coarse grid size.
Outcomes measured
- Calculated internal electric field patterns/field enhancement in gold nanoshells
- Comparison of field enhancement locations vs homogeneous metallic spheres and metallic rings
- Assessment of resonance type (low/high energy) impact on external fields
- Methodological critique of discrete dipole approximation (DDA) results (grid size effects)
View raw extracted JSON
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"outcomes": [
"Calculated internal electric field patterns/field enhancement in gold nanoshells",
"Comparison of field enhancement locations vs homogeneous metallic spheres and metallic rings",
"Assessment of resonance type (low/high energy) impact on external fields",
"Methodological critique of discrete dipole approximation (DDA) results (grid size effects)"
],
"main_findings": "Using Mie theory and the quasistatic approximation, the authors calculate internal field patterns for gold nanoshells and compare them with homogeneous spheres and metallic rings. They report that peak field enhancement in metallic shells occurs perpendicular to the incident polarization, whereas for metallic spheres it occurs along the polarization direction, and that resonance type (low vs high energy) strongly affects external fields. They also state that recent DDA-based results are misleading, possibly due to overly coarse grid size.",
"effect_direction": "unclear",
"limitations": [],
"evidence_strength": "insufficient",
"confidence": 0.74,
"peer_reviewed_likely": "yes",
"keywords": [
"gold nanoshells",
"internal electric field",
"field enhancement",
"Mie theory",
"quasistatic approximation",
"metallic spheres",
"metallic rings",
"discrete dipole approximation",
"resonance",
"external fields"
],
"suggested_hubs": []
}AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.
Identifiers and source
DOI: 10.1021/jp0450686
PubMed: 16851144