Fabrication of high-quality three-dimensional photonic crystal heterostructures

• 来源期刊: 中国物理B（英文版）
• 关键词: photonic crystal heterostructure pressure controlled isothermal heating vertical deposition finite-difference time-domain technique
• 年，卷（期）: 2009,（6）
• 页码范围: 2383-2388
• 页数: 6页
• 语种: 英文

摘要

Three-dimensional photonic crystal (PC) heterostructures with high quality are fabricated by using a pressure controlled isothermal heating vertical deposition technique. The formed heterostructures have higher quality, such as deeper band gaps and sharper band edges, than the heterostructures reported so far. Such a significant improvement in quality is due to the introduction of a thin TiO2 buffer layer between the two constitutional PCs. It is revealed that the disorder caused by lattice mismatch is successfully removed if the buffer layer is used once. As a result, the formed heterostructures possess the main features in the band gap of constitutional PCs. The crucial role of the thin buffer layer is also verified by numerical simulations based on the finite-difference time-domain technique.