Condensation polymers based on two different NLO-active chromophores, namely 2-[4-[(4-N,N-dihydroxyethylamino)phenylazo]phenyl]-5(6)- nitrobenzimidazole ej(BZI) and 2-[4-(4-N,-dihydroxyethylamino)phenylazo]-4,5- dicyanoimidazole (IMI), have been synthesized and their basic properties measured. The second order NLO properties of poled polymers were investigated by SHG procedures at different temperatures (35, 65 and 85 °C) and exposure times. Resonance free d33 coefficients (λ = 1368 nm) took values in the range 1.8-4.0 pm · V-1, but the time stability of their SHG signal was fairly acceptable, particularly for the high T g (e.g. 188 °C) polymer for which relaxation time (at 25 °C) of 2.8 years has been determined.
Carella, A., Centore, R., Sirigu, A., Tuzi, A., Quatela, A., Schutzmann, S., et al. (2004). Second order nonlinear optical performances of polymers containing imidazole and benzimidazole chromophores. MACROMOLECULAR CHEMISTRY AND PHYSICS, 205(14), 1948-1954 [10.1002/macp.200400129].
Second order nonlinear optical performances of polymers containing imidazole and benzimidazole chromophores
CASALBONI, MAURO
2004-01-01
Abstract
Condensation polymers based on two different NLO-active chromophores, namely 2-[4-[(4-N,N-dihydroxyethylamino)phenylazo]phenyl]-5(6)- nitrobenzimidazole ej(BZI) and 2-[4-(4-N,-dihydroxyethylamino)phenylazo]-4,5- dicyanoimidazole (IMI), have been synthesized and their basic properties measured. The second order NLO properties of poled polymers were investigated by SHG procedures at different temperatures (35, 65 and 85 °C) and exposure times. Resonance free d33 coefficients (λ = 1368 nm) took values in the range 1.8-4.0 pm · V-1, but the time stability of their SHG signal was fairly acceptable, particularly for the high T g (e.g. 188 °C) polymer for which relaxation time (at 25 °C) of 2.8 years has been determined.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
