Y. Tajitsu et al., ELECTROOPTICAL EFFECTS OF SINGLE-CRYSTALLINE FILMS OF FERROELECTRIC COPOLYMERS OF VINYLIDENE FLUORIDE AND TRIFLUOROETHYLENE, JPN J A P 2, 36(6A), 1997, pp. 693-695
''Single crystalline'' (SC) films of vinylidene fluoride (VDF) and tri
fluoroethylene (TrFE) copolymers (P(VDF/TrFE)) which are highly double
-oriented films, do not form an intricate highly ordered structure, fo
r example, a lamellar structure, but a simple one. After a SC film is
poled under a de electric field, one-to-one correspondence can be obse
rved between the macro-(drawn and poling axes) and optical axes in a S
C film of P(VDF/TrFE). Therefore; linear electrooptical effects of SC
films of P(VDF/TrFE) can be measured at room temperature and constant
stress. We then found a large electrooptical coefficient in SC films o
f P(VDF/TrFE).