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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 21 — Jul. 20, 2008
  • pp: 3760–3766

Kinetics of photoinduced anisotropy in bacteriorhodopsin film under two pumping beams

Junhe Han, Baoli Yao, Peng Gao, Liju Chen, Yingli Wang, and Ming Lei  »View Author Affiliations

Applied Optics, Vol. 47, Issue 21, pp. 3760-3766 (2008)

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Photoinduced anisotropy in bacteriorhodopsin (BR) film arises from the selective bleaching of BR molecules to linearly polarized light. The kinetics of photoinduced anisotropy excited by single and two pumping beams are investigated theoretically and experimentally. Compared with a single pumping beam ( 650 nm ), which produces comparatively small photoinduced anisotropy, dual-wavelength linearly polarized pumping beams (650 and 405 nm ) can obviously change the photoinduced anisotropy. When the polarization orientation of the 405 nm pumping beam is perpendicular to that of the 650 nm pumping beam, the peak and steady values of the photoinduced anisotropy kinetic curves are remarkably enhanced. But when the two pumping beams have parallel polarization orientation, the peak and steady values are restrained. At a fixed intensity of the 650 nm pumping beam, there exists an optimal intensity for the 405 nm pumping beam to maximize the value of the photoinduced anisotropy. The photoinduced transmittance of the polarizer-BR-analyzer system is modulated by the polarization angle of the 405 nm pumping beam in an approximate-cosine form.

© 2008 Optical Society of America

OCIS Codes
(160.0160) Materials : Materials
(160.1190) Materials : Anisotropic optical materials
(160.1435) Materials : Biomaterials

ToC Category:

Original Manuscript: February 27, 2008
Revised Manuscript: June 5, 2008
Manuscript Accepted: June 13, 2008
Published: July 11, 2008

Junhe Han, Baoli Yao, Peng Gao, Liju Chen, Yingli Wang, and Ming Lei, "Kinetics of photoinduced anisotropy in bacteriorhodopsin film under two pumping beams," Appl. Opt. 47, 3760-3766 (2008)

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