Abstract
This paper presents ferroelectric polarization reversal, internal electric field and second harmonic generation for cold-drawn Nylon 11 films. The draw ratio is between 2.6 and 2.8. Clear polarization reversal for cold-drawn Nylon 11 films can be measured when films are subjected to the sinusoidal applied field at room temperature. The internal electric field created by the aligned dipoles is measured by the spectrum shift and broadening of electrochromic dye. An internal electric field in the order of MV/cm is obtained, which is proportional to the remanent polarization. Second-order optical nonlinearity is measured from the Maker fringe second harmonic generation measurement. Drawn and poled polymer films belong to the mm2 point group and have second-order optical nonlinearity with three different tensor components, d31, d32, and d33. The second harmonic generation coefficients, d33 and d31, increase with increasing remanent polarization, whereas the value of d32 is nearly zero irrespective of the inten...
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