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Comparison of the birefringence in an azobenzene-side-chain copolymer induced by pulsed and continuous-wave irradiation

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons48490

Neher,  Dieter
MPI for Polymer Research, Max Planck Society;

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Citation

Cimrova, V., Neher, D., Hildebrandt, R., Hegelich, M., von der Lieth, A., Marowsky, G., et al. (2002). Comparison of the birefringence in an azobenzene-side-chain copolymer induced by pulsed and continuous-wave irradiation. Applied Physics Letters, 81(7), 1228-1230.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-6558-B
Abstract
A comparative study of photoinduced birefringence in azobenzene-side-chain copolymers under continuous-wave (cw) and pulsed irradiation is presented. Absolute refractive index changes were determined by the attenuated total reflection spectroscopy. We clearly demonstrated that pulsed, similarly to cw, irradiation induces a three-dimensional reorientation of azobenzene chromophores. For the same light dose, pulsed irradiation using ns pulses of appropriate pulse energy led to higher values of birefringence, which can be attributed to a cooperative motion of azobenzene side chains and thermal effects induced by the laser pulses. (C) 2002 American Institute of Physics.