  We have discovered significant temperature anomalies of the linear
electrooptical (EOE) coefficients for the K2ZnCl4 nanocrystallites embedded
into the polymer matrices. The EOE efficiency was operated by external
dc-electric field and UV polarized laser light. The maximal enhancement of EOE
output was achieved within the temperature range 375 K-420 K. This temperature
range corresponds to existence of incommensurate structural modulation. The
maximally achieved field induced EOE efficiency was equal to about 1.4 pm/V for
off-diagonal EOE tensor component. The size and NC content dependences have
been explored for the size range (20 nm-1500 nm) and contents varying within
the 25%-35%. For the sizes about 1200 nm, the EOE is commensurable with the EOE
of the bulk crystals and is equal to about 0.6 pm/V.
