Fe3O<.sub>4/TiO2核壳结构胶体光子晶体的光学传输特性分析
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西安交通大学,西安交通大学,西安交通大学,西安交通大学

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国家自然科学基金项目(面上项目,重点项目,重大项目);中央高校基础研究计划


Analysis for optical transmission characteristic of Fe3O<.sub>4@TiO2 core @shell colloidal photonic crystals
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Xi''an Jiaotong University,Xi''an Jiaotong University,Xi''an Jiaotong University,Xi''an Jiaotong University

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    摘要:

    通过时域有限差分方法(FDTD)计算了核壳结构胶体光子晶体的光学传输特性.这一核壳结构是由低介电的Fe3O4核与高介电的TiO2壳构成的.计算结果表明, 阻带的行为受到材料介电常数和核壳比的调控.随着材料介电常数的增加, 阻带不断红移, 并且带宽不断增大.当核壳结构的整体尺寸一定时, 随着核直径的增大, 阻带不断蓝移, 并且在核壳结构直径与核直径之比为150nm∶130nm时, 带宽最大, 达到33.4%; 当核尺寸一定时, 随着核壳结构整体尺寸的增大, 阻带红移.在Fe3O4@TiO2核壳结构中, 能够出现阻带的TiO2壳层的最小厚度是3nm.

    Abstract:

    The optical transmission characteristic of colloidal photonic crystals with core @shell structure has been calculated via the finite-difference time-domain (FDTD) method. The core @shell structure has been designed using the low-dielectric Fe3O4 core and high-dielectric TiO2 shell. The results show that the behaviors of stop band can be adjusted by the effective permittivity and core @shell size ratio of materials. With the increase of permittivity, the stop bands show redshift and bandwidth increase. When the overall size of core @shell is constant, the stop bands show blueshift with the increasing core diameter, and the maximum bandwidth (Δλ/λ) reaches 33.4% when the diameter ratio between core @shell and core is 150nm: 130nm. When the core size is constant, the stop bands show redshift with the increase of the overall size of the core @shell structure. The minimum thickness of TiO2 shell that can make the stop bands appear is 3nm in the Fe3O4@TiO2 core @shell structure.

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黄岩,梁工英,霍格,卢学刚. Fe3O<. sub>4/TiO2核壳结构胶体光子晶体的光学传输特性分析[J].红外与毫米波学报,2015,34(2):150~156]. HUANG Yan, LIANG Gong-Ying, HUO Ge, LU Xue-Gang. Analysis for optical transmission characteristic of Fe3O<. sub>4@TiO2 core @shell colloidal photonic crystals[J]. J. Infrared Millim. Waves,2015,34(2):150~156.]

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  • 收稿日期:2013-12-11
  • 最后修改日期:2015-01-25
  • 录用日期:2014-02-25
  • 在线发布日期: 2015-05-18
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