Versatile synthesis of small NLO-active molecules forming amorphous materials with spontaneous second-order NLO response.
A novel synthetic approach to a series of bulky triarylamines substituted by various electron-withdrawing groups and forming amorphous materials is presented. Under vacuum evaporation, thin films with high optical quality are obtained and exhibit spontaneous second-order nonlinear optical activity. This unprecedented result is likely due to subtle balance between strong dipole-dipole interactions and steric crowding causing self-assembly and noncentrosymmetric local ordering, stable up to one year.
Ishow
Eléna
E
ENS Cachan, PPSM (CNRS UMR 8531), 61 avenue du Président Wilson, 94235 Cachan Cedex, France. ishow2ppsm.ens-cachan.fr
Bellaïche
Cyril
C
Bouteiller
Laurent
L
Nakatani
Keitaro
K
Delaire
Jacques A
JA