Complete photonic bandgaps in 12-fold symmetric quasicrystals
Complete photonic bandgaps in 12-fold symmetric quasicrystals
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DOI：
10.1038/35008023
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发表时间：
2000-04
期刊：
影响因子：
64.8
通讯作者：
M. Zoorob;M. Charlton;G. Parker;J. Baumberg;M. Netti
中科院分区：
文献类型：
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作者：
M. Zoorob;M. Charlton;G. Parker;J. Baumberg;M. Netti
光子晶体由于各种原因引起了人们的兴趣，例如它们能够抑制光的自发发射。这种特性和相关的特性源于光子带隙的形成，光子通过周期性变化折射率的晶格的多次散射来阻止具有特定波长的电磁波的传播。形成光子晶体的一种途径是在介质板波导中蚀刻垂直空气孔的二维周期性晶格，，，，。这种结构可以显示出完整的光子带隙，但仅适用于高折射率材料（如砷化镓，n= 3.69）中的大直径空气孔，不幸的是，当与低折射率光纤结合时，会导致光传输显著降低。有人提出，准晶体晶格（而不是周期晶格）也可以具有光子带隙。在这里，我们通过实验证明了这一概念，并表明它可以在氮化硅（n= 2.02）甚至玻璃（n= 1.45）中的小气孔中实现完全的光子带隙-非定向和任何极化。这些特性使得光子准晶体有望应用于一系列光学器件，，，，。
Photonic crystals are attracting current interest for a variety of reasons, such as their ability to inhibit the spontaneous emission of light,. This and related properties arise from the formation of photonic bandgaps, whereby multiple scattering of photons by lattices of periodically varying refractive indices acts to prevent the propagation of electromagnetic waves having certain wavelengths. One route to forming photonic crystals is to etch two-dimensional periodic lattices of vertical air holes into dielectric slab waveguides,,,,. Such structures can show complete photonic bandgaps,,, but only for large-diameter air holes in materials of high refractive index (such as gallium arsenide,n= 3.69), which unfortunately leads to significantly reduced optical transmission when combined with optical fibres of low refractive index. It has been suggested that quasicrystalline (rather than periodic) lattices can also possess photonic bandgaps,,,. Here we demonstrate this concept experimentally and show that it enables complete photonic bandgaps—non-directional and for any polarization—to be realized with small air holes in silicon nitride (n= 2.02), and even glass (n= 1.45). These properties make photonic quasicrystals promising for application in a range of optical devices,,,,.