Recent applications in the field of photonics require materials with a large, non-linear response to applied fields. Among the tools that can indicate which organic material has a large hyperpolarizability, there is vibrational spectroscopy. It is shown here that materials with very large Raman intensities have a large, second hyperpolarizability accounted for in terms of relaxation mechanism; it is also suggested that doped materials, which have an anomalously large infrared intensity, can have a large, first hyperpolarizability. Moreover, the relaxation mechanism involved in hyperpolarizabilities can be explained in terms of changes in geometries along the direction of the 'effective conjugation coordinate' R.
NONLINEAR OPTICAL-RESPONSE TO STRONG APPLIED ELECTROMAGNETIC-FIELDS IN POLYCONJUGATED MATERIALS
DEL ZOPPO, MIRELLA ELVIRA ANGELA;CASTIGLIONI, CHIARA;ZERBI, GIUSEPPE;
1992-01-01
Abstract
Recent applications in the field of photonics require materials with a large, non-linear response to applied fields. Among the tools that can indicate which organic material has a large hyperpolarizability, there is vibrational spectroscopy. It is shown here that materials with very large Raman intensities have a large, second hyperpolarizability accounted for in terms of relaxation mechanism; it is also suggested that doped materials, which have an anomalously large infrared intensity, can have a large, first hyperpolarizability. Moreover, the relaxation mechanism involved in hyperpolarizabilities can be explained in terms of changes in geometries along the direction of the 'effective conjugation coordinate' R.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
