Low-contrast bandgaps of a planar parabolic spiral lattice.
Low-contrast bandgaps of a planar parabolic spiral lattice.
复制标题
平面抛物线螺旋晶格的低对比度带隙。
DOI:
10.1364/ol.34.002805
复制
发表时间:
2009
期刊:
影响因子:
3.6
通讯作者:
G. Parker
中科院分区:
文献类型:
--
作者:
M. Pollard;G. Parker
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.