Self-consistent model for photon scanning tunneling microscopy: implications for image formation and light scattering near a phase-conjugating mirror

Bozhevolnyi, Sergey I.; Vohnsen, Brian; Bozhevolnaya, Elena; Berntsen, Svend

doi:10.1364/josaa.13.002381

Cited by 25 publications

(20 citation statements)

References 28 publications

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“…Alternatively, one can consider the imaging of bright spots with uncoated fiber tips that has been modeled theoretically. 38 In these calculations, there was found a good correspondence ͑in the shape and value of half-widths of distributions͒ between the field intensity distribution at 100 nm and the signal dependence measured at 5 nm distance. Comparing our calculations for hϭ100 nm and the experimental results one finds also similar values of enhancement and sizes of bright spots ͑cf.…”

Section: Resultsmentioning

confidence: 56%

“…The near-field intensity distribution is probed with an etched fiber tip that ensures both efficient detection of the evanescent field components 11,12 and relatively accurate imaging. 38 The near-field optical images exhibited a spatially localized ͑within 150-250 nm͒ intensity enhancement of up to 10 times compared to the average background for both wavelengths and polarizations and for various angles of incidence ͑Figs. 5-8͒.…”

Section: Methodsmentioning

confidence: 96%

“…These features are typical for interference phenomena in multiple scattering and consistent with the theoretical predictions of localized optical excitations in fractal structures. [6][7][8][9][10] It should be also kept in mind that, due to the finite resolution of the PSTM with an uncoated fiber tip, 39 localized optical excitations are expected to appear larger and less bright in the near-field images 38 than they are in fact. Consequently, extended optical features, e.g., those related to the light scattering by clusters as a whole, are likely to become visible and to obscure, to some FIG.…”

Section: Methodsmentioning

confidence: 99%

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Direct observation of localized dipolar excitations on rough nanostructured surfaces

et al. 1998

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Direct observation of localized dipolar excitations on rough nanostructured surfacesUsing a photon scanning tunneling microscope ͑operating alternatively at the wavelengths of 594 and 633 nm͒ with shear-force feedback we image the topography of silver colloid fractals simultaneously with a near-field intensity distribution. We observe that near-field optical images exhibit spatially localized ͑within 150-250 nm͒ intensity enhancement by one to two orders of magnitude. These bright light spots are found to be sensitive to the light wavelength, polarization, and angle of incidence. We relate the observed phenomenon to the localization of resonant dipolar excitations in random nanostructured aggregates.

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Section: Resultsmentioning

confidence: 56%

Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

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Direct observation of localized dipolar excitations on rough nanostructured surfaces

et al. 1998

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“…in a 40% solution of hydrofluoric acid͒ fiber tip that ensures both strong optical signal 13 and relatively faithful imaging. 8,24 The SPP excitation exhibited a wellpronounced resonance behavior with the detected optical signal ͑at resonance͒ of ϳ1 -10 nW for the silver film, and 0.1-1 nW for the gold film. It should be mentioned that the signal related to the SPP excited at 633 nm was usually stronger than that connected with the wavelength of 594 nm.…”

Section: ͒mentioning

confidence: 98%

Elastic scattering of surface plasmon polaritons: Modeling and experiment

1998

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Elastic ͑in-plane͒ scattering of surface plasmon polaritons ͑SPP's͒ is modeled by considering isotropic pointlike scatterers whose responses to the incident SPP field are phenomenologically related to their effective polarizabilities. Numerical simulations of single, double, and multiple scattering are presented for randomly situated scatterers showing the interplay between different orders of scattering and localization phenomena. Correlation between the scattering regimes and spatial Fourier spectra of the corresponding SPP intensity distributions is considered. Various optical microcomponents ͑e.g., straight and curved micromirrors͒ formed by sets of point scatterers are also simulated, and the stability and dispersion of their characteristics are investigated. The appropriate experimental results for SPP scattering by both random and specially configured sets of microscatterers are reported for two excitation wavelengths ͑594 and 633 nm͒ and different metal ͑silver and gold͒ films. The near-field optical images obtained are related to the calculated SPP intensity distributions demonstrating that the model developed can be successfully used in studies of SPP elastic scattering, e.g., to design the microcomponents for SPP's.

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“…There exist the collection mode for imaging the observation object by measurement of the transmitted energy, and the illumination mode for imaging by measurement of the scattered wave or internal reflection energy in the fiber resulting from mutual interaction between the near field at the probe tip and the observation object. Many experimental studies and detailed theoretical studies have been reported on the PSTM [11][12][13][14]. Nevertheless, the detailed physical process of imaging using the fiber probe guided wave and the relation-ship between actual image and near field of the object have not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Imaging simulation of near‐field optical scanning microscope: Comparison between dielectric probe and metal‐coated aperture probe

Yoshida

Tanaka

2002

Electron Comm Jpn Pt II

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SUMMARYIn this paper, a simulation code for a two-dimensional photon scanning tunneling microscope (PSTM) is created by using the boundary element method based on the guidedmode extracted integral equation. Imaging simulation is carried out for the cases of a dielectric probe or a metalcoated probe and observation objects that are multiple dielectrics or metals. In the simulation, the transmission coefficient of the guided mode in a collection mode probe with an incident TE wave (s polarization) and the reflection coefficient of the illumination mode for the incident fundamental TE mode are derived. By a probe scan, the relationship between the output image and the observation object is studied. It is shown that the output image contrast decreases and the effect of interference pattern increases with a metal-coated aperture probe, whereas the image characteristics on the output image are improved relative to those obtained with a dielectric probe.

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Self-consistent model for photon scanning tunneling microscopy: implications for image formation and light scattering near a phase-conjugating mirror

Cited by 25 publications

References 28 publications

Direct observation of localized dipolar excitations on rough nanostructured surfaces

Direct observation of localized dipolar excitations on rough nanostructured surfaces

Elastic scattering of surface plasmon polaritons: Modeling and experiment

Imaging simulation of near‐field optical scanning microscope: Comparison between dielectric probe and metal‐coated aperture probe

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