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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3363-3368 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A test configuration for apertureless near-field optical microscopy permits characterization of near-field signals free from significant topography effects. Using a second tip as the scanned object, a high-contrast dipole–dipole signal is observed when the two tips are closely spaced, by 10 nm or less. A spatial resolution on the order of 5 nm is demonstrated. The measured signal is also material dependent: an inverted contrast is recorded when one of two high-dielectric (silicon) tips is replaced by a metallic (nickel) tip. Measurement results are accounted for by theory, which also confirms the nature of the detected signal: it results from interference between a near-field dipole–dipole field scattered by the end of the tips, and a reference field scattered by the main body of the tips. Different illumination sources are investigated. In all cases, the component of the electric field parallel to the tip axes provides the major source of signal and contrast. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5774-5778 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Enhancement γ of the electrical field at the end of a tip relative to the incident field in a focused radiation beam is calculated by the finite-element time-domain (FETD) method. First, the reliability of the FETD method is established by calculating the electric field on simple structures like thin cylinders, spheres, and ellipsoids, and comparing the results with analytical solutions. The calculations on these test structures also reveal that phase retardation effects substantially modify γ when the size of the structure is larger than approximately λ/4, λ being the radiation wavelength. For plasmon resonance, in particular, phase retardation severely reduces the resonance and the expected field enhancement for a gold tip. The small value of γ=4 calculated by FETD is about an order of magnitude smaller than the value found in recent published work. Resonance effects can be recovered for special tips, which have a discontinuity or a different material composition at the end of the tip. Some tuning of the discontinuity dimension is needed to maximize the resonance. Under optimal conditions for plasmon resonance, an enhancement in the electric field of about 50 is calculated at the end of a small gold protrusion mounted on a wider silicon or glass tip. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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