Hsu C.-CHuang T.-HLiu SYeh F.-FJin B.-YSattigeri J.AShiau C.-WTIEN-YAU LUH2022-12-142022-12-14199900092614https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042496243&doi=10.1016%2fS0009-2614%2899%2900849-0&partnerID=40&md5=44fd39ab390e026ba6beedd612e7cb23https://scholars.lib.ntu.edu.tw/handle/123456789/626234Hyper-Rayleigh scattering with a conventional 1064 nm laser source is employed to study the conformation of substituted poly-norbornene polymers that contain the non-linear optical chromophores as pendant groups. The dispersion-free first-hyperpolarizabilities (β0) of the polymers and pendant chromophores are determined and compared. A large enhancement of the β0 values for the polymer samples is observed. Each of the chromophores is found to contribute 39% of its β0 value to that of the polymer, in close agreement with the result of a simple calculation. This agreement supports the syndiotactic polymer conformation already predicted with the open-force-field calculation. Two-photon absorption-induced fluorescence (TPF) exists for most monomers but not for polymers in this study. The absence of TPF in the polymers may be due to the excited-state electronic interaction between pendant chromophores.journal article10.1016/S0009-2614(99)00849-02-s2.0-0042496243