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- W2030047140 abstract "Infrared near-field microscopy using an apertureless probe technique has been accomplished to study the surface of a cast copolymer film. Two basic models for the predicted signal and the experimental data are presented. The first model includes plane wave light scattering by a conductive sphere and an infinitely wide absorptive layer placed on a semi-infinite conductor. This model shows infrared signal dependence on the layer absorption and predicts topographic coupling into the infrared signal. The experimental data also indicate that a significant component in the infrared contrast arises from the probe following the sample's topography, and a method to eliminate the influence of topography following is demonstrated. The images corrected by such a procedure show spatial resolution of approximately λ/80. A more complex model based on a three-dimensional finite difference time domain method was used to calculate scattering from a rough surface. Both constant tip−sample gap and constant tip−substrate height analyses were made, and it is found that constant height imaging is a preferred mode of operation. Calculations for dielectric and Lorentzian materials are reported. These calculations indicate that the near-field infrared signal attenuation for an absorptive object is larger than for a bare layer of the same thickness. This effect may be used to enhance chemical contrast in near-field imaging." @default.
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- W2030047140 date "2001-03-24" @default.
- W2030047140 modified "2023-09-23" @default.
- W2030047140 title "Apertureless Scanning Near-Field Infrared Microscopy of a Rough Polymeric Surface" @default.
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- W2030047140 doi "https://doi.org/10.1021/la001401v" @default.
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