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The Ultra-Wide Band Gap Property Induced by Lattice Period Gradually Changing in Three-Dimensional Photonic Crystals

Authors

  • Wei Dai,

    1. Electronic Materials Research Laboratory, Key Lab of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
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  • Hong Wang,

    Corresponding author
    1. Electronic Materials Research Laboratory, Key Lab of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
      †Author to whom correspondence should be addressed. e-mail: hwang@mail.xjtu.edu.cn
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  • Di Zhou,

    1. Electronic Materials Research Laboratory, Key Lab of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
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  • Zhiyuan Shen,

    1. Micromachines Center, School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
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  • Yong Li,

    1. Electronic Materials Research Laboratory, Key Lab of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
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  • Dichen Li

    1. Rapid-prototyping Engineering Centre of the Ministry of Education Xi'an Jiaotong University, Xi'an 710049, China
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  • M. Sebastian—contributing editor

  • This work was supported by the NSFC project of China (60871044, 50835007), National 973 project of China (2009CB623302), and National Project of International Science and Technology Collaboration (2009DFA51820).

†Author to whom correspondence should be addressed. e-mail: hwang@mail.xjtu.edu.cn

Abstract

The lattice period gradually changing and its ultra-wide band gap property were studied in the three-dimensional diamond photonic crystals (PC) fabricated by rapid prototyping and gel casting techniques using alumina. The band gap width and center frequency of the band gap almost kept stable when the lattice period changed along the direction in vertical to the propagation direction of the electromagnetic wave. When the lattice period stretched along the propagation direction of the electromagnetic wave, the center frequency of the band gap shifted to the lower frequency range while the band gap width increased slightly. Several PCs that stretched along the electromagnetic wave propagation direction were combined together to investigate their complex band gap properties. The band gap width increased with the period change of the combined PCs. When the period change reached 134%, the band gap width became the widest and was 153% of that of the perfect PC, which agreed well with the simulation results by Ansoft HFSS.

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