Fabrication of high-quality three-dimensional photonic crystal heterostructures |
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Authors: | Liu Zheng-Qi Feng Tian-Hu Dai Qiao-Feng Wu Li-Jun and Lan Sheng |
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Institution: | Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China |
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Abstract: | 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. |
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Keywords: | photonic crystal
heterostructure pressure controlled isothermal heating vertical
deposition finite-difference time-domain technique |
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