Lieb晶格等离子体光子晶体基元结构原位调控  

In-Situ Control of Element Structure in Lieb Lattice Plasma Photonic Crystals

作　　者：贾萌萌 侯笑含 武振宇 刘富成[1] 范伟丽[1] Jia Mengmeng;Hou Xiaohan;Wu Zhenyu;Liu Fucheng;Fan Weili(College of Physics Science and Technology,Hebei University,Baoding 071002,Hebei,China)

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《光学学报》2023年第4期147-156,共10页Acta Optica Sinica

基　　金：国家自然科学基金(11875014,11975089);河北省自然科学基金(A2021201010,A2021201003);河北大学自然科学多学科交叉研究计划资助项目(DXK202010,DXK202108)。

摘　　要：利用独特设计的阵列-液体电极介质阻挡放电装置,率先获得了Lieb晶格等离子体光子晶体,并实现了其基元大小、形状和微观形貌的多自由度原位调控。采用光电倍增管对Lieb晶格等离子体光子晶体的时空动力学行为进行了时空分辨测量。基于有限元计算,对不同基元结构的Lieb晶格等离子体光子晶体的色散关系和能带变化规律进行了系统研究。结果表明:Lieb晶格等离子体光子晶体由两套不同四方子晶格相互嵌套形成,具有优异的时空稳定性和周期性;随着Lieb晶格基元构型的改变,光子带隙发生显著变化,形成了偶然简并的类狄拉克锥结构,以及不同频段的完全带隙和非完全带隙;基元的几何形状对光子带隙数目、位置和宽度均具有重要影响。Objective Lieb lattice has been demonstrated to have many striking properties due to its unique Dirac-flat band structure.It has been realized in various systems,such as photonic waveguide arrays,cold atom systems,condensed matter physics,and organic materials.Since the Dirac-flat band structure relies heavily on the structural configurations of the Lieb lattice,it is essential to fabricate tunable Lieb lattices,so as to allow for on-demand control of band structures.Recently,there is a growing interest in plasma photonic crystals(PPCs)comprised of periodic arrays of plasmas and dielectrics.By modulating the plasma density,lattice constant,or lattice symmetry,the PPCs can be tuned dynamically.Various onedimensional PPCs,two-dimensional PPCs with square or triangular geometries,and three-dimensional woodpile-type PPCs have been realized in previous studies,which possess band gaps to manipulate microwaves.However,the PPCs with a Lieb lattice structure have been less concerned so far.Particularly,it is still a challenge to realize PPCs with tunable scattering elements,whose size,shape,and microstructure can be controlled dynamically.In this study,the Lieb plasma photonic crystals(LPPCs)and the in-situ manipulation of plasma scattering elements in dielectric barrier discharge(DBD)are realized.It provides an effective platform to investigate the universal properties of Lieb lattices and may offer inspiration for designing tunable Lieb lattices in other systems.Methods The LPPCs have been studied both experimentally and numerically.In the experiment,a uniquely designed DBD system with array-liquid electrodes is proposed.The array electrode induces a two-dimensional periodic electric field to give a constrained symmetry and lattice constant for the Lieb lattice.The water not only serves as the coolant medium to ensure high stability of the plasma structure but also is a transparent medium beneficial for optical detection.By changing the discharge parameters such as the applied voltage,gas pressure,gas composition,and so

关 键 词：材料 光子带隙材料 介质阻挡放电 等离子体光子晶体 Lieb晶格 基元形貌 

分 类 号：O531[理学—等离子体物理] O539[理学—物理]