Novel phenomena in flatband photonic structures: from localized states to real-space topology

Xia Shi-Qiang; Tang Li-Qin; Xia Shi-Qi; Ma Ji-Na; Yan Wen-Chao; Song Dao-Hong; Hu Yi; Xu Jing-Jun; Chen Zhi-Gang

doi:10.7498/aps.69.20200384

Abstract

In recent years, flatband systems have aroused considerable interest in different branches of physics, from condensed-matter physics to engineered flatband structures such as in ultracold atoms, various metamaterials, electronic materials, and photonic waveguide arrays. Flatband localization, as an important phenomenon in solid state physics, is of broad interest in the exploration of many fundamental physics of many-body systems. We briefly review the recent experimental advances in light localization in engineered flatband lattices, with the emphasis on the optical induction technique of various photonic lattices and unconventional flatband states. The photonic lattices, established by various optical induction techniques, include quasi-one-dimensional diamond lattices and two-dimensional super-honeycomb, Lieb and Kagome lattices. Nontrivial flatband line states, independent of linear superpositions of conventional compact localized states, are demonstrated in photonic Lieb and super-honeycomb lattices, and they can be considered as an indirect illustration of the non-contractible loop states. Furthermore, we discuss alternative approaches to directly observing the non-contractible loop states in photonic Kagome lattices. These robust loop states are direct manifestation of real-space topology in such flatband systems. In this paper we do not intend to comprehensively account the vast flatband literature, but we briefly review the relevant work on photonic lattices mainly from our group. We hope that the mentioned concepts and techniques can be further explored and developed for subsequent applications in other structured photonic media such as photonic crystals, metamaterials, and other synthetic nanophotonic materials.

Keywords:

Authors and contacts

1.
TEDA Institute of Applied Physics, School of Physics, Nankai University, Tianjin 300457, China
2.
School of Physics, Henan Normal University, Xinxiang 453007, China
3.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China

Corresponding author: Song Dao-Hong, songdaohong@nankai.edu.cn ; Xu Jing-Jun, jjxu@nankai.edu.cn ; Chen Zhi-Gang, zgchen@nankai.edu.cn

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图 1 几种典型的平带晶格结构　(a) 菱形晶格; (b) Lieb晶格; (c) Kagome晶格; (d) 超级蜂窝型晶格; 彩色点为常规紧凑排列的局域本征模式示意图, 灰色点振幅为0, 红色点代表振幅为1, 蓝色点为–1, 即两者振幅大小相同而相位差为π

Figure 1. Typical examples of flatband lattices: (a) Quasi-one-dimensional (1D) rhombic lattice; (b) Lieb lattice; (c) Kagome lattice; (d) super-honeycomb lattice (sHCL). Compact localized states (CLSs) are depicted as colored sites, where zero amplitudes are denoted by gray color, and those with non-zero amplitudes of opposite phase are denoted by red and blue colors.

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图 2 光子系统中平带研究的典型实例　(a) 左图为表面等离激元平带的金属Kagome超构材料, 右图为对应的太赫兹波透射图, 存在一个全角度的无辐射平带(水平虚线所示)^[48]; (b) 左图为四方结构的全介质零折射率超构材料实现隐身效应实验装置, 右图为适当介质参数时得到的四方结构色散关系, 含有一个狄拉克锥与一个无色散平带^[50]; (c) 一维“枕”型结构的微柱光学腔及其色散关系, 中间为平带^[51]

Figure 2. Examples of photonic flatband structures: (a) Kagome lattice for terahertz spoof plasmons, displaying an omnidirectional minimum in the transmission at the flatband frequency (dashed line) in the right panel^[48]; (b) experimental setup exposing the zero-refractive-index all-dielectric metamaterials with a square lattice to realize cloaking inside a channel with the Dirac point, and the right panel shows corresponding three-dimensional dispersion diagrams consisting of a Dirac cone and a flatband^[50]; (c) structured microcavity forming a 1D stub lattice and its photoluminescence spectrum, revealing a flatband in the middle^[51].

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图 3 利用飞秒激光直写技术制备的平带光子晶格　(a) 用于研究平带局域模式的Lieb光子晶格^[64,65]; (b) 用于研究拓扑角态的Kagome光子晶格^[66]; (c) 用于实现Aharonov-Bohm效应的纵向弯曲菱形光子晶格^[67,68]

Figure 3. Examples of femtosecond laser-writing flatband photonic lattices: (a) A photonic Lieb lattice for demonstration of flatband compact localized states^[64,65]; (b) a photonic Kagome lattice established for demonstration of topological corner states^[66]; (c) a driven photonic rhombic lattice for experimental observation of Aharonov-Bohm cages^[67,68].

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图 4 多光束干涉光诱导技术制备光子晶格^[80,83], 其中第一排为实验光路图(PBS, 偏振分光棱镜; Mask, 掩膜板; SBN, 铌酸锶钡晶体); 第二排为实验制作的典型光子晶格　(a) 蜂窝型光子晶格; (b) 对称破缺的蜂窝型光子晶格; (c) 涡旋晶格; (d) Kagome晶格

Figure 4. Examples of photonic lattices created by multiple-beam optical induction method^[80,83]. Top panel shows schematic of experimental setup. PBS, polarized beam splitter; SBN, strontium barium niobite. Bottom panel shows typical examples of photonic lattices realized in experiment: (a) A “perfect” honeycomb lattice; (b) an inversion-symmetry-breaking honeycomb lattice; (c) a vortex lattice; (d) a Kagome lattice.

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图 5 连续激光直写技术制备不同平带光子晶格, 其中, 第一排为实验光路图(SLM, 空间光调制器; BS, 分光棱镜; FM, 傅里叶掩膜板); 第二排为典型的直写光子晶格　(a)“胡须”边界(“bearded” edges)的Lieb光子晶格^[89]; (b) 平滑边界的Kagome光子晶格^[90]; (c) 超级蜂窝晶格^[91]; (d) 横向折射率梯度变化的菱形光子晶格^[92]

Figure 5. Examples of photonic lattices created by direct cw-laser-writing technique in a nonlinear bulk crystal. Top panel shows illustration of experimental setup. SLM, spatial light modulator; BS, beam splitter; FM, Fourier mask. Bottom panel shows typical examples of photonic lattices created by direct cw-laser-writing method: (a) A photonic Lieb lattice with “bearded” edges^[89]; (b) a photonic Kagome lattice with flat boundary^[90]; (c) a photonic sHCL^[91]; (d) a driven photonic rhombic lattice with refractive index gradient parallel to the ribbon^[92].

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图 6 平带光子晶格常规紧凑局域模式的实验结果(从左至右: 实验制备的光诱导光子晶格结构、紧束缚近似下能带结构、入射面探测光、同相位输出以及反相位输出)　(a) Lieb光子晶格中基于平带模式的图像传输^[85]; (b) Kagome光子晶格中的平带局域模式^[104]; (c) 折射率梯度场下菱形光子晶格中U = 2的局域本征模式^[92]

Figure 6. Experimental results of CLSs in flatband lattices: (a) Linear image (formed by CLSs) propagation through an optically induced Lieb photonic lattice^[85]; (b) a bound-state transmission in a Kagome photonic lattice^[104]; (c) observation of a quincunx-shaped (U = 2) compact localized state which spans over two-unit cells in a photonic rhombic lattice^[92]. From left to right: shown are the lattices, calculated band structures in the tight-binding approximation, probe beam inputs, and their in-phase and out-of-phase outputs.

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图 7 Lieb与超级蜂窝光子晶格中非常规线形平带模式的实验结果^[89,91]　(a), (d)非常规线形平带局域模式的示意图, 其中图(d)右下插图为能带结构; (b1), (e1) 反相位入射的探测光; (b2), (e2) 无晶格时的输出; (b3), (e3) 有晶格时的输出; (b4), (e4) 长距离传输的数值模拟结果; 图(c1)−(c4)完全对应(b1)−(b4), 但为探测光同相位入射时的结果; 图(f1)−(f4)对应(e1)−(e4), 但为探测光同相位入射时的结果; (b5), (c5)为对应(b3), (c3)的k空间能谱, 虚线框为第一布里渊区边界; (e5) 为对应于图(e3)的k空间能量分布, 其中虚线框表示第一与第二布里渊区边界

Figure 7. Demonstration of unconventional line state in photonic Lieb and super-honeycomb lattices^[89,91]: (a), (d) Schematic of flatband line states in infinite lattices, and insect in (d) shows the band structure of sHCL; (b1), (e1) out-of-phase input line beam; (b2), (e2) out-of-phase output without the lattice; (b3), (e3) out-of-phase output through the lattice; (b4), (e4) simulation results showing the out-of-phase line beam remains intact but the in-phase line deteriorates after propagating a long distance through the lattice; (b5) measured k-space spectrum of (b3) with a dashed square marking the first Brillouin zone (BZ); (c1)−(c5) the same as in (b1)−(b5), and (f1)−(f4) the same as in (e1)−(e4) except that the line beam is in in-phase excitation condition; (e5) momentum space spectrum of (e3), where the white dashed lines outline the first and second BZs.

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图 8 (a) Kagome晶格中两种不可压缩环形态示意图; (b) 模拟无限Kagome晶格两个不可压缩环形态的圆环面; (c) 在平滑边界的Kagome晶格中两种稳定的平带边界局域模, 橘黄色线代表模式一, 绿色虚线代表模式二; (d) Corbino-Kagome结构示意图, 橘黄色圆环代表不可压缩的局域环形态; (e) 从左至右, (e1), (e2) 边界模式一的反相位输出与对应数值模拟结果; (e3), (e4) 边界模式二的反相位输出与对应数值模拟结果; (f1) 实验制备的Corbino-Kagome光子晶格; (f2), (f3)反相位激发的不可压缩环形态及其对应数值模拟结果; (f4) 40 mm传输时数值模拟结果; 图中所有插图均代表输入探测光; 同相位激发破坏所有平带局域模式的形成^[90]

Figure 8. (a) Illustration of the noncontractible loop states (NLSs) in an infinitely extended Kagome lattice; (b) a torus showing two NLSs mimicking the 2D infinite lattice; (c) two robust boundary modes (RBMs) in a Kagome lattice with flat cutting edges, where black sites are of zero-amplitude, while blue and red ones distinguish non-zero sites with opposite phase; (d) schematic diagram of the Corbino-shaped Kagome lattice, where the NLS is illustrated by the orange circle; (e) from left to right (e1), (e3) experimental results of RBM1 and RBM2 under out-of-phase condition; (e2), (e4) simulation result corresponding to (e1) and (e3); (f1) experimentally established finite-sized Kagome lattice in a Corbino-geometry; (f2)－(f4) the NLS observed in (f2) experiment and (f3) simulations after propagation to 10 mm and (f4) 40 mm under out-of-phase condition. All insets are from input ring necklace of the probe beam. In-phase excitation destroys all localized states^[90].

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