Accession Number:
ADA393689
Title:
Apertureless Scanning Near-Field Infrared Microscopy of Polymers
Descriptive Note:
Technical rept.
Corporate Author:
PITTSBURGH UNIV PA DEPT OF CHEMISTRY
Personal Author(s):
Report Date:
2000-01-01
Pagination or Media Count:
3.0
Abstract:
Infrared near field microscopy using an apertureless probe technique has been accomplished to study the surfaces 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 problem following the samples topography and a method to eliminate the influence of topography following is demonstrated. The images corrected by such a procedure show spatial resolution approximately lambalOO. A more complex model based on a three dimensional finite difference time domain method was used to calculate scattering from an inhomogeneous surface.
Descriptors:
- *SCANNING
- *POLYMERS
- *MICROSCOPY
- *NEAR INFRARED RADIATION
- *NEAR FIELD
- COUPLING(INTERACTION)
- SPATIAL DISTRIBUTION
- LIGHT SCATTERING
- PROBES
- SCATTERING
- CONTRAST
- EXPERIMENTAL DATA
- CONDUCTIVITY
- RESOLUTION
- FILMS
- COPOLYMERS
- SPHERES
- TOPOGRAPHY
- ABSORBERS(MATERIALS)
- SIGNALS
- SAMPLING
- ABSORPTION
- APERTURES
- PLANE WAVES
- CASTINGS
Subject Categories:
- Polymer Chemistry
- Optics