OPTICAL 2ND-HARMONIC GENERATION OF (DIMETHYLAMINO)BENZONITRILE MOLECULES INCORPORATED IN THE MOLECULAR-SIEVE ALPO4-5

Citation
F. Marlow et al., OPTICAL 2ND-HARMONIC GENERATION OF (DIMETHYLAMINO)BENZONITRILE MOLECULES INCORPORATED IN THE MOLECULAR-SIEVE ALPO4-5, Journal of physical chemistry, 97(43), 1993, pp. 11286-11290
Citations number
18
Categorie Soggetti
Chemistry Physical
ISSN journal
00223654
Volume
97
Issue
43
Year of publication
1993
Pages
11286 - 11290
Database
ISI
SICI code
0022-3654(1993)97:43<11286:O2GO(M>2.0.ZU;2-9
Abstract
For (dimethylamino)benzonitrile (DMABN) in the straight Pores of the a luminophosphate molecular sieve AlPO4-5, two components of the second harmonic generation (SHG) have been found. One component of the freque ncy-doubled radiation is polarized parallel to the length axis (z axis , phi2 = 0-degrees) of the crystal and exhibits the maximum intensity when the excitation beam has the same polarization. The second compone nt, however, is polarized perpendicularly to the z axis (phi2 = 90-deg rees) and shows the maximum efficiency for mixed excitation (phi = 45- degrees). Obviously, different components of the hyperpolarizability t ensor contribute to the resulting SHG. The reason for the different te nsor elements are the two close-lying lowest excited states in DMABN h aving transition dipole matrix elements perpendicular to each other. I n contrast to molecular sieves loaded with p-nitroaniline which arc ab le to mix waves of the same polarization only, for the DMABN-based mat erials a mixing of waves of different polarizations is observed. This is a promising property for phase-matching as a prerequisite for a tec hnical application.