Measurement of the Zak phase of photonic bands through the interface states of a metasurface/photonic crystal
Measurement of the Zak phase of photonic bands through the interface states of a metasurface/photonic crystal
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通过超表面/光子晶体的界面态测量光子带的 Zak 相
DOI：
10.1103/physrevb.93.041415
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发表时间：
2016-01-21
影响因子：
3.7
通讯作者：
Chan, C. T.
中科院分区：
文献类型：
--
作者：
Wang, Qiang;Xiao, Meng;Chan, C. T.
Zak相标记了一维Bloch带的拓扑性质。在这里，我们提出了一种方案，并实验测量了光子系统中的Zak位相。的体带的Zak相与夹在该带中的两个带隙的拓扑性质有关，而这又可以从界面态的存在或不存在来推断。通过反射光谱测量，我们确定了禁带中界面态的存在，进而得到了Zak相。Zak相的知识还可以帮助我们预测准表面和光子晶体之间界面态的存在。通过操纵亚表面的性质，我们可以进一步调节激发频率和界面态的极化。
Zak phase labels the topological property of one-dimensional Bloch Bands. Here we propose a scheme and experimentally measure the Zak phase in a photonic system. The Zak phase of a bulk band of is related to the topological properties of the two band gaps sandwiching this band, which in turn can be inferred from the existence or absence of an interface state. Using reflection spectrum measurement, we determined the existence of interface states in the gaps, and then obtained the Zak phases. The knowledge of Zak phases can also help us predict the existence of interface states between a metasurface and a photonic crystal. By manipulating the property of the metasurface, we can further tune the excitation frequency and the polarization of the interface state.