Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3

Sun Changqing

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Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3

Sun Changqing 1 * #, 2

1.Nanyang Technological University

*Correspondence author

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Funding: none

Opened online:18 July 2005

Accepted by: none

Citation: Sun Changqing,.Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3[OL]. [18 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2475

SiO2 colloid crystal infilled with BaTiO3 was synthesized by a process of self-assembly in combination of sol-gel technique. It is found that infilling the fully crystallized BaTiO3 into the colloid assembly can enhance the photonic band gap significantly. In the vicinity of the ferroelectric phase transition point of BaTiO3 (100-150oC), the photonic band gap of 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 photonic band gap should be of high interest in device application.

Keywords:photonic crystal; sol-gel

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