Optical second-harmonic images of sacran megamolecule aggregates

We have detected a second-order nonlinear optical response from aggregates of the ampholytic megamolecular polysaccharide sacran extracted from cyanobacterial biomaterials by using optical second-harmonic-generation (SHG) microscopy. The SHG images of sacran cotton-like lump, fibers, and cast films...

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Veröffentlicht in:Journal of the Optical Society of America. A, Optics, image science, and vision Optics, image science, and vision, 2017-02, Vol.34 (2), p.146-152
Hauptverfasser: Zhao, Yue, Thu Hien, Khuat Thi, Mizutani, Goro, Rutt, Harvey N, Amornwachirabodee, Kittima, Okajima, Maiko, Kaneko, Tatsuo
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Sprache:eng
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Zusammenfassung:We have detected a second-order nonlinear optical response from aggregates of the ampholytic megamolecular polysaccharide sacran extracted from cyanobacterial biomaterials by using optical second-harmonic-generation (SHG) microscopy. The SHG images of sacran cotton-like lump, fibers, and cast films showed SHG intensity microspots of several tens of micrometers in size. The dependence of the SHG spot intensity on an excitation light polarization angle was observed to illustrate sacran molecular orientation in these microdomains. We also observed SHG signals around a special region of the cast film edges of sacran. These results show that sacran megamolecules aggregate in several different ways.
ISSN:1084-7529
1520-8532
DOI:10.1364/josaa.34.000146