J. Zhou et al., Thermally tuning of the photonic band gap of SiO2 colloid-crystal infilledwith ferroelectric BaTiO3, APPL PHYS L, 78(5), 2001, pp. 661-663
SiO2 colloid crystal infilled with BaTiO3 was synthesized by a process of s
elf-assembly in combination of a sol-gel technique. It is found that infill
ing of the fully crystallized BaTiO3 into the colloid assembly can enhance
the photonic band gap significantly. In the vicinity of the ferroelectric p
hase transition point of BaTiO3 (100-150 degreesC), the photonic band gap o
f the assembly exhibits a strong temperature dependence. At the Curie point
, the band gap has a 20 nm redshift, and the optical transmittance reaches
its minimum. Such a temperature-tuning effect in the photonic band gap shou
ld be of high interest in device applications. (C) 2001 American Institute
of Physics.