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Abstract:
For (dimethylamino)benzonitrile (DMABN) in the straight pores of the aluminophosphate molecular sieve
A1P04-5, two components of the second harmonic generation (SHG) have been found. One component of the
frequency-doubled radiation is polarized parallel to the length axis (z axis, Ø
2
= 0°) of the crystal and exhibits
the maximum intensity when the excitation beam has the same polarization. The second component, however,
is polarized perpendicularly to the z axis (Ø2
= 90°) and shows the maximum efficiency for mixed excitation
(Ø = 45°) . Obviously, different components of the hyperpolarizability tensor contribute to the resulting SHG.
The reason for the different tensor elements are the two close-lying lowest excited states in DMABN having
transition dipole matrix elements perpendicular to each other. In contrast to molecular sieves loaded with
p-nitroaniline which are able to mix waves of the same polarization only, for the DMABN-based materials a
mixing of waves of different polarizations
