Time-resolved waveguide modulation of a conjugated polymer
- 12 December 1988
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 53 (24) , 2374-2376
- https://doi.org/10.1063/1.100234
Abstract
We present a new pump and probe technique for measuring intensity‐dependent refractive indices (n2) of waveguide quality thin films, and we apply it to films of polydiacetylene‐(CH2)4OCONHOCOC4H9 (PDA‐4BCMU). Just below the exciton absorption band, the real part of n2 is negative with magnitude ≊10−7(MW/cm2)−1. The initial fast response of n2 is followed by a slower (∼2.5 ps) decay, in close agreement with the decay of the bleaching of the exciton absorption following resonant excitation. These results are consistent with phase space filling by excitons as the mechanism for the nonlinear index.Keywords
This publication has 5 references indexed in Scilit:
- Nonlinear optical response of excitons confined to one dimensionPhysical Review Letters, 1987
- Time and wavelength resolved nonlinear optical spectroscopy of a polydiacetylene in the solid state using picosecond dye laser pulsesApplied Physics Letters, 1985
- Intensity-dependent index of refraction in multilayers of polydiacetyleneApplied Physics Letters, 1983
- Picosecond Photoinduced Dichroism inTrans-: Direct Measurement of Soliton DiffusionPhysical Review Letters, 1982
- The ATR method with focused light — Application to guided waves on a gratingOptics Communications, 1978