Nonlinear Optical Properties of Semiconducting Polymers.
Abstract
This program focused on the nonlinear optical properties of semiconducting conjugated polymers. Specific emphasis was on fast time (picosecond regime) measurements of the photoconductivity of semiconducting polymers and on NLO measurements related to the mechanism and origin of the nonlinearity, on attempts to optimize the magnitude of the nonlinear response, and on developing novel methods for measurement. In the NLO area, we succeeded in demonstrating that for conjugated polymers the nonlinear response is highly anisotropic with substantial nonlinearity only when the pump is polarized along the direction parallel to the polymer backbone. In attempting to sort out the NLO mechanism we carried out comparative studies on cis and transpolyacetylene. The larger NLO response from the trans-isomer (larger by at least a factor of 20) shows the importance of the degerate ground state.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1990
- Accession Number
- ADA240753
Entities
People
- Alan J. Heeger
Organizations
- University of California, Santa Barbara