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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150 nm∶130 nm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3 nm.
The optical transmission properties of core-shell colloidal photonic crystals were calculated by the finite-difference time-domain method (FDTD). The core-shell structure consisted of a low dielectric Fe3O4 core and a high dielectric TiO2 shell. The behavior of the tape is governed by the permittivity of the material and the ratio of the core to the shell.With the increase of the dielectric constant of the material, the stopband keeps red-shifting and the bandwidth increases continuously.When the overall size of the core-shell structure is constant, , And the stopband is blue-shifted continuously. The maximum bandwidth is 33.4% when the ratio of core-shell diameter to core diameter is 150 nm: 130 nm. When the core size is constant, with the overall size of the core-shell structure Increase, stop band redshift.In the Fe3O4 @ TiO2 core-shell structure, the minimum thickness of the TiO2 shell capable of stopbanding is 3 nm.