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Photoinduced grating formation in a polymer containing azo-carbazole dyes |
Applied Optics, Vol. 51, Issue 27, pp. 6653-6660 (2012)
http://dx.doi.org/10.1364/AO.51.006653
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Abstract
Although some azo-carbazole derivatives attached on or doped into inert polymers are known to show photorefractive effect without external electric field, the origin of their asymmetric energy transfer in two-beam coupling experiments were unknown. We made the two-beam coupling experiment followed by sample translation and one-beam diffraction at 633 nm for thick films composed of 3-[(4-nitrophenyl)]azo-9H-carbazole-9-ethanol (NACzEtOH) and poly(methylmethacrylate), finding that photoinduced gratings grew in several minutes accompanied with phase displacement of the gratings, but the phase shift was not always synchronized with the refractive index modulation. We reformulated the Kogelnik’s coupled-wave theory with strict energy conservation law for analysis. Comparison of the grating growth and erasure at 532 nm to Disperse Red 1 (DR1), the most well-known azo dye showed that the photoisomerization was dominant at this wavelength and that the azo-carbazole dyes were faster in response time and more resistive to erasure than DR1.
© 2012 Optical Society of America
OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(090.7330) Holography : Volume gratings
(160.4330) Materials : Nonlinear optical materials
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(190.5330) Nonlinear optics : Photorefractive optics
(190.2055) Nonlinear optics : Dynamic gratings
ToC Category:
Nonlinear Optics
History
Original Manuscript: June 18, 2012
Revised Manuscript: August 6, 2012
Manuscript Accepted: August 16, 2012
Published: September 20, 2012
Citation
Yutaka Kawabe, Kodai Fukuzawa, Takuya Uemura, Katsufumi Matsuura, Toshio Yoshikawa, Jun-ichi Nishide, and Hiroyuki Sasabe, "Photoinduced grating formation in a polymer containing azo-carbazole dyes," Appl. Opt. 51, 6653-6660 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-27-6653
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