Far-field probing of leaky topological states in all-dielectric metasurfaces.
Far-field probing of leaky topological states in all-dielectric metasurfaces.
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DOI：
10.1038/s41467-018-03330-9
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发表时间：
2018-03-02
影响因子：
16.6
通讯作者：
Khanikaev AB
中科院分区：
文献类型：
--
作者：
Gorlach MA;Ni X;Smirnova DA;Korobkin D;Zhirihin D;Slobozhanyuk AP;Belov PA;Alù A;Khanikaev AB
在凝聚态系统中的拓扑相变产生了奇异的物质状态，如拓扑绝缘体，超导体和超流体。光子拓扑系统开辟了一个全新的研究领域和技术机会，展示了一些重要的区别，从他们的凝聚态同行。光子模可以泄漏到自由空间，这使得通过Fano共振的光谱手段探测拓扑光子相位成为可能。基于这一思想，我们开发了一种技术，从测量的远场散射特性检索的拓扑特性的全介质超颖表面。收集的角度分辨光谱提供动量相关的频率和寿命的光子模式，使检索的有效哈密顿量和提取的拓扑不变量。我们的研究结果表明，如何开放的非厄米系统的拓扑状态可以通过远场测量探索，从而铺平了道路，通过拓扑效应控制独特的散射特性的超颖表面的设计。光子学系统中的拓扑模式并不完全局限于结构中，而是可以泄漏到自由空间中。在这里，Gorlach等人利用这些泄漏模式来探测来自远场散射测量的电介质超颖表面的拓扑特性。
Topological phase transitions in condensed matter systems give rise to exotic states of matter such as topological insulators, superconductors, and superfluids. Photonic topological systems open a whole new realm of research and technological opportunities, exhibiting a number of important distinctions from their condensed matter counterparts. Photonic modes can leak into free space, which makes it possible to probe topological photonic phases by spectroscopic means via Fano resonances. Based on this idea, we develop a technique to retrieve the topological properties of all-dielectric metasurfaces from the measured far-field scattering characteristics. Collected angle-resolved spectra provide the momentum-dependent frequencies and lifetimes of the photonic modes that enable the retrieval of the effective Hamiltonian and extraction of the topological invariant. Our results demonstrate how the topological states of open non-Hermitian systems can be explored via far-field measurements, thus paving a way to the design of metasurfaces with unique scattering characteristics controlled via topological effects. Topological modes in photonics systems are not completely confined to the structure but can leak into free space. Here, Gorlach et al. exploit these leaky modes to probe the topological properties of a dielectric metasurface from far-field scattering measurements.
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影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
41.2
作者：
Khanikaev, Alexander B.;Mousavi, S. Hossein;Shvets, Gennady
通讯作者：
Shvets, Gennady
用于控制自旋和拓扑的谷光子晶体
影响因子：
41.2
作者：
Dong, Jian-Wen;Chen, Xiao-Dong;Zhang, Xiang
通讯作者：
Zhang, Xiang
影响因子：
2.9
作者：
Raghu, S.;Haldane, F. D. M.
通讯作者：
Haldane, F. D. M.
DOI：
10.1088/0022-3719/6/7/010
发表时间：
1973-01-01
期刊：
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS
影响因子：
--
作者：
Kosterlitz, JM;Thouless, DJ
通讯作者：
Thouless, DJ