Electroabsorption and nonlinear optical constants of trans-polyacetylene and poly(3-hexylthiophene)
We present the results of electroabsorption measurements on thin films of -polyacetylene and poly(3-hexylthiophene). The induced changes in the adsorption coefficient are found to be quadratic in the applied electric field. The third order nonlinear susceptibility, ?dc(3)(?,0,0), and the change in the complex index of refraction are calculated via a Kramers-Kronig analysis of the data. For -polyacetylene, a maximum value for the magnitude of ?(3) ? 3 × 10?8 esu occurs near the band edge. ?(3) for poly(3-hexylthiophene) is about an order of magnitude smaller. The temperature and polarization dependence of the electroabsorption signal are also reported.
Worland, R, S.D Phillips, W.C Walker, and A.J Heeger. "Electroabsorption and Nonlinear Optical Constants of Trans-Polyacetylene and Poly(3-Hexylthiophene)." Synthetic Metals. 28.3 (1989). Print.