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中国物理学会期刊

含双曲超构材料的复合周期结构的带隙调控及应用

CSTR: 32037.14.aps.69.20200084

Band gap engineering and applications in compound periodic structure containing hyperbolic metamaterials

CSTR: 32037.14.aps.69.20200084
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  • 等频面的拓扑结构强烈影响光在材料中的行为. 通常组成光子晶体原胞的材料都是介电材料, 其等频面都具有相同的封闭拓扑结构. 结构最为简单的光子晶体是由两种介电材料交替组成的一维光子晶体. 然而, 这种传统的光子晶体在横磁和横电偏振下的光子带隙将随着入射角的增大而向短波方向移动, 既不利于全向带隙的产生与展宽, 又使得基于光子带隙的一些应用限制在很窄的入射角度范围内. 本综述利用双曲超构材料对电磁波相位的独特调控作用, 在由具有开放的等频面的双曲超构材料和具有封闭的等频面的普通介电材料交替组成的复合周期结构中实现了随入射角零移以及红移的特殊带隙, 为研制具有新型功能的光学器件提供了新机理. 基于零移带隙, 可设计具有固定带宽的全向反射器和宽角度的近完美光吸收器. 基于红移带隙, 可设计宽角度的偏振选择器和超灵敏折射率传感器.

     

    Behaviours of light in materials strongly depend on the topological structure of the iso-frequency surface (IFS). The usual materials, of which the unit cell of photonic crystal is made up, are dielectrics, whose IFSs have the same closed topological structure. As a simplest photonic crystal, one-dimensional photonic crystal (1DPC) has attracted intensive attention due to its simple fabrication technique as well as numerous applications. However, in a conventional all-dielectric 1DPC, photonic band gaps (PBGs) for both transverse magnetic (TM) and transverse electric (TE) polarizations will shift toward short wavelengths (i.e. blueshift) as incident angle increases. The underlying physical reason is that the propagating phase in isotropic dielectric will decrease as incident angle increases. The blueshift property of band gap for TM and TE polarization will limit the band width of omnidirectional band gap and the range of operating incident angles in some PBG-based applications, including near-perfect absorption, polarization selection and sensitive refractive index sensing. However, for TM polarization, the propagating phase in a hyperbolic metamaterial (HMM) will increase with incident angle increasing. This special phase property of HMM provides us with a way to flexibly tune the angle-dependent property of band gap in periodic compound structure composed of alternative HMM with open IFS and dielectric with close IFS. In this review, we realize zeroshift (i.e. angle-independent) band gaps as well as redshift band gaps in 1DPCs containing HMMs, which can be utilized to realize near-perfect absorption, sensitive refractive index sensing and polarization selection working in a wide range of incident angles.

     

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