Accession Number:

ADA393689

Title:

Apertureless Scanning Near-Field Infrared Microscopy of Polymers

Descriptive Note:

Technical rept.

Corporate Author:

PITTSBURGH UNIV PA DEPT OF CHEMISTRY

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.

Subject Categories:

  • Polymer Chemistry
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE