Volume plasmon polaritons in semiconductor hyperbolic metamaterials
Volume plasmon polaritons in semiconductor hyperbolic metamaterials
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DOI：
10.1364/ome.7.002672
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发表时间：
2017-07
影响因子：
2.8
通讯作者：
Dongxia Wei;C. Harris;S. Law
中科院分区：
文献类型：
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作者：
Dongxia Wei;C. Harris;S. Law
层状双曲型超材料能够支持波矢远大于自由空间中光的体模。这些模式是许多提出的超材料器件的基础。在本文中，我们提出的实验数据测量这些模式的色散关系的红外半导体双曲型超材料。超材料的光学特性建模考虑到由于导带弯曲和有效质量的非抛物线性的样品中的载流子密度的函数形式。在两种不同的样品中，我们观察到了多个体等离子体极化激元模，并利用多周期光栅耦合器追踪了模色散。最后，我们讨论如何改进这些材料。
Layered hyperbolic metamaterials are able to support bulk modes with wavevectors much larger than light in free space. These modes are the foundation of many proposed metamaterial devices. In this paper, we present experimental data measuring the dispersion relationship of these modes in infrared semiconductor hyperbolic metamaterials. The metamaterial optical properties are modeled by taking into account the functional form of the carrier density in the sample due to conduction band bending and the non-parabolicity of the effective mass. In two different samples, we observe multiple volume plasmon polariton modes, and the mode dispersion is traced out by using grating couplers with multiple periodicities. We close by discussing ways to improve these materials.