A crucial goal for modern telecommunications systems is development of very high-speed components for broadband (> 100 GHz), all-optical signal/information processing. The core component of such technologies is the electro-optic modulator, which encodes electrical signals onto fibre-optic transmissions. A significant challenge therefore is obtaining materials that have large electro-optic responses and that can be readily fabricated into devices at low cost. We report here on the realization of high-response heteroaromatic organic chromophores that can be straightforwardly self-organized from the vapour phase into intrinsically acentric, high-quality, micrometre-scale films. These pi-conjugated electrooptically active films (with second-order susceptibilities up to similar to 100 pm V-1) are thermally stable and conveniently grown by a simple physical vapour deposition process in a few hours. Supramolecular acentricity is achieved without electric field poling, enforced by biomimetic heterocycle hydroxycarbonyl head-to-tail hydrogen-bonding.
Facchetti, A., Annoni, E., Beverina, L., Morone, M., Zhu, P., Marks, T., et al. (2004). Very large electro-optic responses in H-bonded heteroaromatic films grown by physical vapour deposition. NATURE MATERIALS, 3(12), 910-917 [10.1038/nmat1259].
Very large electro-optic responses in H-bonded heteroaromatic films grown by physical vapour deposition
BEVERINA, LUCA;
2004
Abstract
A crucial goal for modern telecommunications systems is development of very high-speed components for broadband (> 100 GHz), all-optical signal/information processing. The core component of such technologies is the electro-optic modulator, which encodes electrical signals onto fibre-optic transmissions. A significant challenge therefore is obtaining materials that have large electro-optic responses and that can be readily fabricated into devices at low cost. We report here on the realization of high-response heteroaromatic organic chromophores that can be straightforwardly self-organized from the vapour phase into intrinsically acentric, high-quality, micrometre-scale films. These pi-conjugated electrooptically active films (with second-order susceptibilities up to similar to 100 pm V-1) are thermally stable and conveniently grown by a simple physical vapour deposition process in a few hours. Supramolecular acentricity is achieved without electric field poling, enforced by biomimetic heterocycle hydroxycarbonyl head-to-tail hydrogen-bonding.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.