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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Strong self-defocusing effect and four-wave mixing in bacteriorhodopsin films

O Werner, B Fischer, A Lewis

    Optics Letters
    |September 29, 2009
    PubMed

    Abstract:

    We find strong self-defocusing in bacteriorhodopsin films in the near IR with powers in the tens of milliwatts. The defocused beam acquires a ring pattern because of spatial self-phase modulation. We also demonstrate efficient four-wave mixing with phase-conjugate reflectivities of 26%. We discuss the origin of this high nonlinearity.

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