Enhanced optical absorption and electric field resonance in diabolo metal bar optical antennas.

Optics express · 2013 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3106

Study snapshot

PublicationOptics express · 2013

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Resonance behaviors of the fundamental resonance mode of diabolo metal bar optical antennas are investigated by using finite-difference time-domain (FDTD) numerical simulations and a dipole oscillator model. It is found that as the waist of the diabolo metal bar optical antenna is reduced, optical energy absorption cross section and near field enhancement at resonance increase significantly. Also reduction of the diabolo waist width causes red-shift of the resonant wavelengths in the spectra of absorption cross-section, scattering cross-section, and the near electric field. A dipole oscillator model including the self-inductance force is used to fit the FDTD numerical simulation results. The dipole oscillator model characterizes well the resonance behaviors of narrow waist diabolo metal bar optical antennas.

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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.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Using FDTD simulations and a dipole oscillator model, reducing the waist width of a diabolo metal bar optical antenna increased the optical absorption cross section and near-field enhancement at resonance. Waist reduction also caused a red-shift in resonant wavelengths in absorption, scattering, and near electric field spectra; a dipole oscillator model including self-inductance fit the simulation results for narrow-waist antennas.

Outcomes measured

optical energy absorption cross section
near-field enhancement
resonant wavelength shift (red-shift)
scattering cross section
near electric field resonance behavior

Limitations

Study is based on numerical simulations and modeling (FDTD and dipole oscillator model); no experimental validation described in the abstract.
No biological/health outcomes or exposure metrics (e.g., frequency, SAR) are provided in the abstract.

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "optical energy absorption cross section",
    "near-field enhancement",
    "resonant wavelength shift (red-shift)",
    "scattering cross section",
    "near electric field resonance behavior"
  ],
  "main_findings": "Using FDTD simulations and a dipole oscillator model, reducing the waist width of a diabolo metal bar optical antenna increased the optical absorption cross section and near-field enhancement at resonance. Waist reduction also caused a red-shift in resonant wavelengths in absorption, scattering, and near electric field spectra; a dipole oscillator model including self-inductance fit the simulation results for narrow-waist antennas.",
  "effect_direction": "unclear",
  "limitations": [
    "Study is based on numerical simulations and modeling (FDTD and dipole oscillator model); no experimental validation described in the abstract.",
    "No biological/health outcomes or exposure metrics (e.g., frequency, SAR) are provided in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "optical antenna",
    "diabolo metal bar",
    "FDTD",
    "dipole oscillator model",
    "near-field enhancement",
    "absorption cross section",
    "scattering cross section",
    "resonance",
    "red-shift",
    "self-inductance"
  ],
  "suggested_hubs": []
}

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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: 10.1364/oe.21.032491
PubMed: 24514842

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