EO polymer at cryogenic temperatures
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
|Journal / Publication||Electronics Letters|
|Publication status||Published - 29 Sep 2016|
|Link to Scopus||https://www.scopus.com/record/display.uri?eid=2-s2.0-84988893999&origin=recordpage|
Electro-optic (EO) properties at 7 K of a guest-host type nonlinear poled polymer system consisting of AJLZ53 chromophores in an amorphous polycarbonate host are reported for the first time. A modi-fied attenuated total reflection method that takes into account multilayer structure is used to accurately characterise linear and nonlinear optical properties. At the telecommunication wavelength of 1550 nm, <10% drop of the EO coefficient r33 at 7 K is observed compared with that at 300 K, while n3r33 only decreases <5% because of increased anisotropic indices of refraction at low temperatures. This decrease of the r33 at 7 K indicates that the EO activity of nonlinear polymers at room temperatures is not of pure electronic origin because of vibrational mode contributions to the first-order hyperpolarisability.