  We have detected second-order nonlinear optical response from an amphoteric
mega-saccharides named sacran under a needle/ring electrode stimulus by using
an optical second harmonic generation (SHG) microscope. SHG was observed from
sacran in the neighborhood of the negatively biased needle electrode below -4.5
V with respect to the outer ring electrode. From the incident light
polarization dependence of SHG, this sacran was suggested to be oriented toward
the electrode needle. SHG of the sacran polymer was judged to be induced by
sacran aggregates with net positive charge.
