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Abstract
We have observed second harmonic generation (SHG) at 532 nm in randomly oriented suspensions of the purple membrane of Halobacterium halobium. The intensity of the second harmonic can be switched by photoexcitation of the bacteriorhodopsin (BR) chromophore at 570 nm. The SHG intensity decreases in <1 μs and reaches a minimum in <1 ms with the formation ofthe M state of BR. For dilute samples, we have observed photoinduccd changes in the SHG intensity of up to 90%. At low concentrations, the second harmonic intensity in light- adapted BR depends linearly on concentration, while showing saturation at higher concentrations. The linear concentration dependence shows that coherence of the second-order polarization between membrane particles is weak
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