Third-order nonlinear optical properties of poly(diphenyl amine) and poly(4-amino biphenyl), novel processible conducting polymers

Off-resonant third-order nonlinear optical susceptibilities using degenerate four-wave mixing measurements in solution at 1.064 μm are reported for partially doped states of the soluble, stable, reprocessible conducting polymers poly(4-amino biphenyl) [P(4ABP)] and poly(diphenyl amine) [P(DPA)] whose synthesis and properties were reported earlier. The polymers show appreciable nonlinearities, χ(3)xxxx being (1.4±0.3)×10−10 esu for P(4ABP) and (1.3±0.3)×10−10 esu for P(DPA), with a time response faster than 40 ps.