共查询到20条相似文献，搜索用时 62 毫秒
1.
在传统光学原理框架下,高效光传输问题在集成光电子领域的发展受到了制约。人们希望从物理源头出发,提出新型原理机制或设计方法,来获得整体上的高保真光传输性能。这正好与近年兴起的拓扑光子学内涵相吻合。近年来,光子晶体和超构材料等多种电磁系统都被用于拓扑光子学的研究中,并受到了广泛关注。文章简要回顾拓扑光子学的发展历程,重点介绍能谷光子晶体的物理特性和最新研究进展,集中论述了电磁对偶能谷光子晶体的理论提出、能谷光子晶体分类与微波实验观测、硅基能谷光子晶体与光波段传输实现等方面。最后,将讨论该领域的未来,并展望其在微纳集成光子学领域的可能发展方向。 相似文献
2.
Valley pseudospin, a new degree of freedom in photonic lattices, provides an intriguing way to manipulate photons and enhance the robustness of optical networks. Here, topological waveguiding, refracting, resonating, and routing of valley‐polarized photons in integrated circuits are experimentally demonstrated. Specifically, it is shown that at the domain wall between photonic crystals of different topological valley phases, there exists a topologically protected valley kink state that is backscattering‐free at sharp bends and terminals. These valley kink states are further harnessed for constructing high‐Q topological photonic crystal cavities with tortuously shaped cavity geometries. A novel optical routing scheme at an intersection of multiple valley kink states is also demonstrated, where light splits counterintuitively due to the valley pseudospin of photons. These results can not only lead to robust optical communication and signal processing, but also open the door for fundamental research of topological photonics in areas such as lasing, quantum photon‐pair generation, and optomechanics. 相似文献
3.
基于背散射抑制且对缺陷免疫的传输性质,光子拓扑绝缘体为电磁传输调控提供了一种新颖的思路.类比电子体系中的量子自旋霍尔效应,本文设计出一种简单的二维介电光子晶体,以实现自旋依赖的光子拓扑边界态.该光子晶体是正三角环形硅柱子在空气中排列而成的蜂窝结构.将硅柱子绕各自中心旋转60°,可实现二重简并的偶极子态和四极子态之间的能带翻转.这两对二重简并态的平均能流密度围绕原胞中心的手性可充当赝自旋自由度,其点群对称性可用来构建赝时间反演对称.根据k·p微扰理论,给出了布里渊区中心附近的有效哈密顿量以及对应的自旋陈数,由此证实能带翻转的实质是拓扑相变.数值计算结果揭示,在拓扑非平庸和平庸的光子晶体分界面上可实现单向传输且对弯曲、空穴等缺陷免疫的拓扑边界态.本文中的光子晶体只由电介质材料组成并且晶格结构简单,实现拓扑相变时无需改变柱子的填充率或位置,只需转动一个角度.因此,这种结构在拓扑边界态的应用中更为有效. 相似文献
4.
Qiaolu Chen Li Zhang Mengjia He Zuojia Wang Xiao Lin Fei Gao Yihao Yang Baile Zhang Hongsheng Chen 《Advanced Optical Materials》2019,7(15)
Extensive researches have revealed that valley, a binary degree of freedom (DOF), can be an excellent candidate of information carrier. Recently, valley DOF is introduced into photonic systems, and several valley‐Hall photonic topological insulators (PTIs) are experimentally demonstrated. However, in the previous valley‐Hall PTIs, topological kink states only work at a single frequency band, which limits potential applications in multiband waveguides, filters, communications, and so on. To overcome this challenge, here a valley‐Hall PTI, where the topological kink states exist at two separated frequency bands, is experimentally demonstrated in a microwave substrate‐integrated circuitry. Both the simulated and experimental results demonstrate the dual‐band valley‐Hall topological kink states are robust against the sharp bends of the internal domain wall with negligible intervalley scattering. This work may pave the way for multichannel substrate‐integrated photonic devices with high efficiency and high capacity for information communications and processing. 相似文献
5.
6.
Qiuchen Yan Xiaoyong Hu Yulan Fu Cuicui Lu Chongxiao Fan Qihang Liu Xilin Feng Quan Sun Qihuang Gong 《Advanced Optical Materials》2021,9(15):2001739
Quantum topological photonics is a new research field with great potential that is based on developments in both quantum optics and topological photonics. Topological photonics offers unique properties, including topological robustness and an anti-backscattering property, and these advantages are strongly required in quantum optics. Quantum technology, which includes quantum optics, represents an important direction for future technological development. However, existing quantum light sources are unstable and quantum information may easily be lost during transmission. These disadvantages have troubled researchers for a long time and no perfect solution is available thus far. Fortunately, application of topological photonics to quantum optics can help to generate robust quantum light sources and protect photons from decoherence during photon propagation. This allows the correlation and entanglement to be maintained even when photons travel over long distances. To date, quantum topological photonics has provided major breakthroughs in certain quantum devices. This Review presents the basic concepts of quantum topological photonics and summarizes how the topological protection property works in quantum light sources, quantum information transmission, and other quantum devices. Finally, an outlook is provided on the remaining challenges and potential future directions of quantum topological photonics, which can aid in exploration of additional new phenomena. 相似文献
7.
8.
Dirac费米子作为粒子物理中的基本粒子之一,其理论在近年来蓬勃发展的拓扑电子理论领域中被广泛提及并用来刻画具有Dirac费米子性质的电子态.这种特殊的能态通常被称为Dirac点,在能谱上表现为两条不同能带之间的线性交叉点.由于Dirac点往往是发生拓扑相变的转变点,因而也被视为实现各种拓扑态的重要母态.作为可与拓扑电子体系类比的拓扑光子晶体因其独特的潜在应用价值也受到人们的广泛关注,实现包含Dirac点的光子能带已成为研究拓扑光子晶体的核心课题.本文基于电子的拓扑理论,简要地回顾了Dirac点在光子系统中的研究进展,特别介绍了如何在光子晶体中利用不同晶格对称性实现在高对称点/线上的Dirac点,以及由Dirac点衍生的Weyl点. 相似文献
9.
10.
11.
《Advanced Optical Materials》2018,6(18)
The gyroid “srs” network is a bio‐inspired, 3D periodic network with both cubic symmetry and chirality, which is modeled (and named) after the SrSi2 crystal. It is an excellent starting point for the development of chiral photonic materials and a powerful platform for the study of complex morphologies and novel photonic topological states. In this Progress Report, the most advanced top‐down fabrication techniques, characterization methods, and applications of metallic and dielectric gyroid micro and nanostructures are reviewed. More importantly, new research directions involving these bio‐inspired photonic materials are presented and their potential applications in integrated photonics, topological photonics, and medical sciences are discussed. 相似文献
12.
近年来,新材料结构、新理论观点、新器件架构等各个前沿方向的通力合作促使了智能光子学的迅猛发展。具有优异非线性特性的光学平台奠定了光子芯片丰富性能的基础,非厄米拓扑光子学等新理论的引入为高性能片上处理方案开辟了新的可能性,各类光学神经网络架构的新器件也为全光计算及全光大规模集成提供了有效的实现途径。基于上述背景,文章介绍了近年来对于智能光子学发展至关重要的非线性材料、非厄米拓扑光子学以及基于光学神经网络的新器件架构等领域的研究进展,并指出相关研究的发展对于未来更大规模、更高集成度、更复杂计算性能的智能光子芯片的实现将产生深远影响,在全光计算、全光信号处理、量子技术等领域有广泛的应用前景。 相似文献
13.
The recent realization of photonic topological insulators has brought the discovery of fundamentally new states of light and revolutionary applications such as nonreciprocal devices for photonic diodes and robust waveguides for light routing. The spatially distinguished layer pseudospin has attracted attention in two‐dimensional electronic materials but it is yet to be discovered in topological photonic structures. Here, all‐dielectric layered photonic topological insulators based on bilayer photonic crystal slabs are reported. The introduction of layer pseudospin offers more dispersion engineering capability, leading to the layer‐polarized and layer‐mixed photonic topological insulators. Their phase transition is demonstrated with a model Hamiltonian by considering the nonzero interlayer coupling. Layer‐direction locking behavior of layer‐polarized photonic topological insulators results in the selective light refraction. High transmission is observed in the bilayer domain wall between two layer‐mixed photonic topological insulators, even when a large defect is introduced. Layered photonic topological insulators not only offer a route toward the observation of richer nontrivial phases, but also open a way for device applications in integrated photonics and information processing by using the additional layer pseudospin. 相似文献
14.
15.
Smith-Purcell radiation from a charge running near a photonic crystal is calculated for a slab system of a periodic array of dielectric spheres, with the photonic band effect taken into account exactly. The radiation spectrum has a series of resonantly enhanced structures, which are shown to arise accompanying the excitation of the photonic bands. It is also shown that the overall intensity of the emission band does not depend very strongly on the slab thickness but the height of the resonant peaks increases progressively with thickness due to the enhanced Q value of excited photonic bands. 相似文献
16.
17.
18.
Topological edge solitons represent a significant research topic in the nonlinear topological photonics. They maintain their profiles during propagation, due to the joint action of lattice potential and nonlinearity, and at the same time are immune to defects or disorders, thanks to the topological protection. In the past few years topological edge solitons were reported in systems composed of helical waveguide arrays, in which the time-reversal symmetry is effectively broken. Very recently, topological valley Hall edge solitons have been demonstrated in straight waveguide arrays with the time-reversal symmetry preserved. However, these were scalar solitary structures. Here, for the first time, we report vector valley Hall edge solitons in straight waveguide arrays arranged according to the photonic lattice with innate type-II Dirac cones, which is different from the traditional photonic lattices with type-I Dirac cones such as honeycomb lattice. This comes about because the valley Hall edge state can possess both negative and positive dispersions, which allows the mixing of two different edge states into a vector soliton. Our results not only provide a novel avenue for manipulating topological edge states in the nonlinear regime, but also enlighten relevant research based on the lattices with type-II Dirac cones. 相似文献
19.
研究了零折射率材料微腔中人造原子与腔模的相干耦合现象.首先通过数值模拟的方法研究了在二维光子晶体微腔中填充阻抗匹配的零折射率材料后腔模的场分布.结果表明零折射率材料的引入使得原本以驻波场形式存在的腔模分布在整个微腔中变得近似均匀且值最大.其次,将人造原子放入腔中的不同位置并与腔模耦合,结果从频谱上观察到腔模的劈裂与人造原子在腔中的位置无关.最后,利用微波实验,通过开口谐振环等效的人造原子与一维复合左右手传输线等效的零折射率材料微腔之间的耦合验证了仿真结果的准确性.该结果为腔量子电动力学中量子点对位难的问题提供了新的方案,同时零折射率材料微腔也为今后研究原子与光子之间的相互作用提供了一个新的平台. 相似文献
20.