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Kinetics of photoinduced anisotropy in bacteriorhodopsin film under two pumping beams

机译：两泵浦光作用下细菌视紫红质膜光诱导各向异性的动力学

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摘要

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.
机译：细菌视紫红质（BR）膜中的光诱导各向异性是由BR分子选择性漂白为线性偏振光引起的。从理论上和实验上研究了单泵浦和两泵浦光束激发的光致各向异性的动力学。与产生相对较小的光致各向异性的单泵浦光束（650 nm）相比，双波长线性偏振泵浦光束（650和405 nm）可以明显改变光致各向异性。当405 nm泵浦光束的偏振方向垂直于650 nm泵浦光束的偏振方向时，光诱导各向异性动力学曲线的峰值和稳定值会显着提高。但是，当两个泵浦光束具有平行的偏振方向时，峰值和稳态值会受到限制。在650 nm泵浦光束的固定强度下，存在405 nm泵浦光束的最佳强度，以使光致各向异性值最大化。偏振器-BR-分析仪系统的光导透射率由405 nm泵浦光束的偏振角以近似余弦形式调制。

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