Low-contrast bandgaps of a planar parabolic spiral lattice.

Low-contrast bandgaps of a planar parabolic spiral lattice.
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平面抛物线螺旋晶格的低对比度带隙。

DOI:
10.1364/ol.34.002805
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发表时间:
2009
期刊:
影响因子:
3.6
通讯作者:
G. Parker
G. Parker
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Pollard;G. Parker

文献摘要

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我们发现,一个平面的非周期性晶格,模仿向日葵的外观,支持弱介电对比度的光子带隙。该图案的高取向顺序和空间均匀的模态间距产生各向同性傅立叶空间。一个二维结构的圆柱体(=2)在空气中拥有一个宽的21% TM带隙,与5.6%的六重晶格或14%的12倍分形平铺。各向同性的间隙频率意味着平坦的带,因此在非线性光学和低阈值激光器中的应用,其中可能期望在所有方向上减小的群速度。
We show that a planar aperiodic lattice, mimicking the appearance of a sunflower, supports photonic bandgaps for weak dielectric contrast. The pattern's high orientational order and spatially uniform modal pitch yields an isotropic Fourier space. A 2D structure of cylinders (=2) in air possesses a wide 21% TM bandgap, versus 5.6% for a sixfold lattice or 14% for a 12-fold fractal tiling. The isotropic gap frequencies imply flat bands, and thus application in nonlinear optics and low threshold lasers, where a reduced group velocity in all directions may be desired.