Investigation of electric field enhancement between metal blocks at the focused field generated by a radially polarized beam.

PAPER pubmed Optics express 2013 Engineering / measurement Effect: unclear Evidence: Insufficient

Read original paper → DOI: 10.1364/oe.21.032217 PMID: 24514816 Evidence Lab

Abstract

A radially polarized beam possesses peculiar focusing properties compared with a linearly polarized beam, for example, the generation of a strong longitudinal field and zero intensity of the Poynting vector on the beam axis. In order to exploit these focusing properties, here we consider a system in which gold metal cubes are arranged along the propagation direction of the beam. An electric field enhancement of more than 20-times can be generated between two gold cubes separated by a distance λ/10 on the optical axis. This is because the energy of a radially polarized beam can propagate even if a metal cube is located on the beam axis, and a longitudinal field generated between the cubes can induce a surface plasmon mode. We show that these results are peculiar properties that cannot be produced with an incident linearly polarized beam. We also show that the beam can generate multiple regions of electrical field enhancement in the propagating direction when multiple metal cubes are arranged on the beam axis.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

unclear

Population

—

Sample size

—

Exposure

radially polarized beam focused field with gold metal cubes

Evidence strength

Insufficient

Confidence: 74% · Peer-reviewed: yes

Main findings

In a system with gold cubes arranged along the propagation direction of a focused radially polarized beam, the electric field between two cubes separated by bb/10 on the optical axis can be enhanced by more than 20-fold. The enhancement is attributed to propagation of the beam energy despite a cube on-axis and to a longitudinal field between cubes inducing a surface plasmon mode; these effects were reported as not achievable with an incident linearly polarized beam. Multiple enhancement regions can be generated when multiple cubes are arranged on the beam axis.

Outcomes measured

electric field enhancement between metal cubes
generation of longitudinal electric field
surface plasmon mode induction
multiple regions of electric field enhancement along propagation direction

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": null,
        "source": "radially polarized beam focused field with gold metal cubes",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "electric field enhancement between metal cubes",
        "generation of longitudinal electric field",
        "surface plasmon mode induction",
        "multiple regions of electric field enhancement along propagation direction"
    ],
    "main_findings": "In a system with gold cubes arranged along the propagation direction of a focused radially polarized beam, the electric field between two cubes separated by \u0003bb/10 on the optical axis can be enhanced by more than 20-fold. The enhancement is attributed to propagation of the beam energy despite a cube on-axis and to a longitudinal field between cubes inducing a surface plasmon mode; these effects were reported as not achievable with an incident linearly polarized beam. Multiple enhancement regions can be generated when multiple cubes are arranged on the beam axis.",
    "effect_direction": "unclear",
    "limitations": [],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "radially polarized beam",
        "focused field",
        "electric field enhancement",
        "gold cubes",
        "longitudinal field",
        "surface plasmon",
        "Poynting vector",
        "optical axis"
    ],
    "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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