Abstract
Asymmetric \(\upbeta \)-sheet protein structures in spider silk should induce nonlinear optical interaction such as second harmonic generation (SHG) which is experimentally observed for a radial line and dragline spider silk using an imaging femtosecond laser SHG microscope. By comparing different spider silks, we found that the SHG signal correlates with the existence of the protein \(\upbeta \)-sheets. Measurements of the polarization dependence of SHG from the dragline indicated that the \(\upbeta \)-sheet has a nonlinear response depending on the direction of the incident electric field. We propose a model of what orientation the \(\upbeta \)-sheet takes in spider silk.








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Zhao, Y., Hien, K.T.T., Mizutani, G. et al. Second-order nonlinear optical microscopy of spider silk. Appl. Phys. B 123, 188 (2017). https://doi.org/10.1007/s00340-017-6766-z
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DOI: https://doi.org/10.1007/s00340-017-6766-z


