A. G. Barriuso, J. J. Monzon, L. L. Sanchez-Soto, A. Felipe
We determine the range of thicknesses and refractive indices for which omnidirectional reflection from quasiperiodic multilayers occurs. By resorting to the notion of area under the transmittance curve, we assess in a systematic way the performance of the different quasiperiodic Fibonacci multilayers.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
We have designed, optimized, fabricated and characterized highly reflective quasi-omnidirectional (angular range of $0-60^\circ$) multilayered structures with a wide spectral range. Two techniques, chirping (a continuous change in thicknesses) and stacking of Bragg-type sub-structures, have been used to enhance the reflectance with minimum thickness for a given pair of refractive indices. Numerical calculations were carried out employing the transfer matrix method and we optimized the design parameters to obtain maximal reflectance averaged over different spectral ranges for all angles. We fab…
We theoretically investigate the possibility of realizing a nonlinear all-optical diode by using the unique features of quasiperiodic 1D photonic crystals. The interplay between the intrinsic spatial asymmetry in odd-order Thue-Morse lattices and Kerr nonlinearity, combined with the unconventional field localization properties of this class of quasiperiodic sequences, gives rise to sharp resonances that can be used to give a polarization-insensitive, nonreciprocal propagation with a contrast close to unity for low optical intensities.
Photonic bandgap design is one of the most basic ways to effectively control the interaction between light and matter. However, the traditional photonic bandgap is always dispersive (blueshift with the increase of the incident angle), which is disadvantageous to the construction of wide-angle optical devices. Hypercrystal, that the photonic crystal with layered hyperbolic metamaterials (HMMs), can strongly modify the bandgap properties based on the anomalous wavevector dispersion of the HMM. Here, based on phase variation compensation between HMM and isotropic dielectric layers, we propose for…
We measured and calculated transmission spectra of two-dimensional quasiperiodic photonic crystals (PCs) based on a 5-fold (Penrose) or 8-fold (octagonal) symmetric quasiperiodic pattern. The photonic crystal consisted of dielectric cylindrical rods in air placed normal to the basal plane on vertices of tiles composing the quasiperiodic pattern. An isotropic photonic band gap (PBG) appeared in the TM mode, where electric fields were parallel to the rods, even when the real part of a dielectric constant of the rod was as small as 2.4. An isotropic PBG-like dip was seen in tiny Penrose and octag…
The light propagation through a stack of two media with different refractive indices, which are aligned according to different quasiperiodic sequences determined by metallic means, is studied using the transfer matrix method. The focus lies on the investigation of the influence of the underlying quasiperiodic sequence as well as the dependence of the transmission on the frequency, the incidence angle of the light wave and different ratios of the refractive indices. In contrast to a periodically aligned stack we find complete transmission for the quasiperiodic systems for a wide range of differ…
Omnidirectional photonic chiral flatband in nonlocal membrane metasurfaces
通过弱耦合紧束缚模型在非局域硅膜超表面中实现全向平带共振，并通过打破空气孔镜面对称性赋予其手性，获得高Q因子和圆二色性，驱动高效三次谐波产生和手性上转换成像。
Probing the Topological Anderson Transition in Quasiperiodic Photonic Lattices via Chiral Displacement and Wavelength Tuning
研究通过准周期调制光子SSH晶格的胞内耦合实现拓扑Anderson转变，利用波长调谐测量光在晶格体内传输的平均手位移，揭示了系统在平庸相与拓扑相间的重入转变。
The surface of thin-film solar cells can be tailored with photonic nanostructures to allow light trapping in the absorbing medium. This in turn increases the optical thickness of the film and thus enhances their absorption. Such a coherent light trapping is generally accomplished with deterministic photonic architectures. Here, we experimentally explore the use of a different nanostructure, a disordered one, for this purpose. We show that the disorder-induced modes in the film allow improvements in the absorption over a broad range of frequencies and impinging angles.
Reentrant phase transition in quasiperiodic photonic waveguides
本研究利用准周期光子波导观测到次近邻格点跳跃诱导的局域化-退局域化重入相变，发现其临界指数ν≃1/3且在L~10³-10⁴系统尺寸下可实验观测，为安德森相变机制研究提供关键见解。
Multistable localized states in highly photonic polariton rings with a quasiperiodic modulation
该理论研究准周期调制的极化激元环形微腔，发现强调制产生迁移率边分离局域态，局域模式可由共振泵浦激发，相互作用导致多稳态及迟滞，并可在双环腔中实现。
Waves propagating in certain one-dimensional quasiperiodic lattices are known to exhibit a sharp localization transition. We theoretically predict and experimentally observe that the localization of light in one-dimensional photonic quasicrystals may be followed by a second delocalization transition for some states on increasing quasiperiodic modulation strength - an example of a reentrant transition. We further propose that this phenomenon can be qualitatively captured by a dimerized tight-binding model with long-range couplings.
Observation of end-to-end pumping in a quasiperiodic Fibonacci-type photonic chain
研究通过准周期斐波那契型光子链实现端到端泵送，利用紧束缚模型和实验验证，展示其在结构变形下的鲁棒性，为抗干扰态传输提供实验可行平台。
Quantum walk is a key operation in quantum computing, simulation, communication and information. Here, we report for the first time the demonstration of quantum walks and localized quantum walks in a new type of optical fibers having a ring of cores constructed with both periodic and quasiperiodic Fibonacci sequences, respectively. Good agreement between theoretical and experimental results have been achieved. The new multicore ring fibers provide a new platform for experiments of quantum effects in low-loss optical fibers which is critical for scalability of real applications with large-size …
Topological Pumping Through a Localized Bulk in a Photonic Hofstadter System
本文通过光子霍夫曼-阿夫鲁-安德烈模型研究强无序与鲁棒拓扑输运的相互作用，利用多层光子晶体实现霍夫曼蝴蝶图和手性边态，并通过数值模拟和实验验证了准周期调制诱导的波长选择性局域化转变。
Observation of Thouless pumping of light in quasiperiodic photonic crystals
本研究在连续非公度光折变准晶体中实验观测到光束的Thouless泵浦，发现输运由子晶格周期比、滑动角和陈数决定，表明准周期系统与周期近似的物理联系可实验验证。
Spectral Distribution of one-dimensional Photonic Quasicrystals: The Role of Irrational Numbers
本文研究了一维光子准晶体的谱分布，发现其谱结构受无理数参数β的大小影响，呈现出与β相关的线性关系。
Structural hierarchy and complex 3D architecture are characteristics of biological photonic designs that are challenging to reproduce in synthetic materials. Top-down lithography allows for designer patterning of arbitrary shapes, but is largely restricted to planar 2D structures. Self-assembly techniques facilitate easy fabrication of 3D photonic crystals, but controllable defect-integration is difficult. In this paper we combine the advantages of top-down and bottom-up fabrication, developing two techniques to deposit 2D-lithographically-patterned planar layers on top of or in between invers…
The propagation of s- and p-polarized light through quasiperiodic multilayers, consisting of layers with different refractive indices, is studied by the transfer matrix method. In particular, we focus on the transmission coefficient of the systems in dependency on the incidence angle and on the ratio of the refractive indices. We obtain additional bands with almost complete transmission in the quasiperiodic systems at frequencies in the range of the photonic band gap of a system with a periodic alignment of the two materials for both types of light polarization. With increasing incidence angle…
In this chapter, first we will address principal aspects of 1D quasiperiodicity with a particular focus on 1D Fibonacci chains. Further, the rest of the chapter will be dedicated to the electromagnetic counterpart of 1D Fibonacci structures as a relatively simplest case of the large class of photonic quasicrystals.
Originally emerged within the context of string and quantum field theory, and later fruitfully extrapolated to photonics, the algebraic transformations of quantum-mechanical supersymmetry were conceived in the space realm. Here, we introduce a paradigm shift, demonstrating that Maxwell's equations also possess an underlying supersymmetry in the time domain. As a result, we obtain a simple analytic relation between the scattering coefficients of a large variety of time-varying optical systems and uncover a wide new class of reflectionless, three dimensional, all-dielectric, isotropic, omnidirec…
We investigate the optical transmission spectra for $s$-polarized (TE) and $p$-polarized (TM) waves in one-dimensional photonic quasicrystals on a quasiperiodic multilayer structure made up by alternate layers of SiO$_{2}$ and \textit{metamaterials}, organized by following the Octonacci sequence. Maxwell's equations and the transfer-matrix technique are used to derive the transmission spectra for the propagation of normaly and obliquely incident optical fields. We assume Drude-Lorentz-type dispersive response for the dielectric permittivity and magnetic permeability of the metamaterials. For n…
Omnidirectional wave impedance matching and Goos-Hanchen shifts in non-Hermitian balanced positive-negative index metamaterials
研究非厄米反宇称-时间（APT）光子学中由平衡正折射率材料（PIM）和负折射率材料（NIM）构成的波反射，发现全向波阻抗匹配（WIM）可在无极化依赖下实现，而反射谷伴随相位跳变导致显著古斯-汉欣（GH）位移。
In the recent years, there has been a drive towards the realization of topological phases beyond conventional electronic materials, including phases defined in more than three dimensions. We propose a way to realize 2nd Chern number topological phases with photonic crystals simply made up of defect resonators embedded within a regular lattice of resonators. In particular, through a novel quasiperiodic spatial modulations in the defect radii, a defect lattice possessing topologically nontrivial Chern bands with non-abelian berry curvature living in four-dimensional synthetic space is proposed. …
We report on the first experimental evidence of guided resonances (GRs) in photonic crystal slabs based on aperiodically-ordered supercells. Using the Ammann-Beenker (quasiperiodic, 8-fold symmetric) tiling geometry, we present our study on the fabrication, experimental characterization, and full-wave numerical simulation of two representative structures (with different filling parameters) operating at near-infrared wavelengths (1300-1600 nm). Our results show a fairly good agreement between measurements and numerical predictions, and pave the way for the development of new strategies (based, …
Aperiodic-quasiperiodic-periodic properties and topological transitions in twisted nested Moiré patterns
本文研究了扭曲嵌套Moiré图案的非周期-准周期-周期性质，基于提出的TNPC推导了SGFs和SSHϕ哈密顿量，揭示了其与拓扑转变的关联，获得了具有C2z对称性的高阶拓扑态。
Three-dimensional non-reciprocal transport in photonic topological heterostructure of arbitrary shape
本文利用陈向量构建任意截面形状的光子拓扑异质结构，实验实现了三维大体积非互易拓扑传输，并展示了电磁波无反射穿越障碍物和突变结构的能力。
Quasiperiodic lattices have recently been shown to be a non-trivial topological phase of matter. Charge pumping -- one of the hallmarks of topological states of matter -- was recently realized for photons in a one-dimensional (1D) off-diagonal Harper model implemented in a photonic waveguide array. The topologically nontrivial 1D Fibonacci quasicrystal (QC) is expected to facilitate a similar phenomenon, but its discrete nature and lack of pumping parameter hinder the experimental study of such topological effects. In this work we overcome these obstacles by utilizing a family of topologically…
Formation of nonlinear modes in one-dimensional quasiperiodic lattices with a mobility edge
研究一维准周期晶格中玻色-爱因斯坦凝聚体的稳态形成，揭示线性与非线性模式转变规律，发现对称势中非线性模式的分岔行为，其结果可推广至准周期光子晶格的光学模式。
We perform full 3D topology optimization (in which "every voxel" of the unit cell is a degree of freedom) of photonic-crystal structures in order to find optimal omnidirectional band gaps for various symmetry groups, including fcc (including diamond), bcc, and simple-cubic lattices. Even without imposing the constraints of any fabrication process, the resulting optimal gaps are only slightly larger than previous hand designs, suggesting that current photonic crystals are nearly optimal in this respect. However, optimization can discover new structures, e.g. a new fcc structure with the same sy…
Scattering Singularity in Topological Dielectric Photonic Crystals
本研究通过平面波展开计算二维光子晶体反射谱，揭示零散射线作为非平凡Zak相的拓扑起源，为表征拓扑相提供新视角并指导器件设计。
Analytic representation formulas and power series are developed describing the band structure inside non-magnetic periodic photonic three-dimensional crystals made from high dielectric contrast inclusions. Central to this approach is the identification and utilization of a resonance spectrum for quasiperiodic source-free modes. These modes are used to represent solution operators associated with electromagnetic and acoustic waves inside periodic high contrast media. A convergent power series for the Bloch wave spectrum is recovered from the representation formulas. Explicit conditions on the c…
10 dB emission suppression in a structured low index medium
本研究提出一种由多个重叠光栅组成的准周期 3D 结构，在倒易空间球面上均匀分布 Bragg 峰，在低折射率（低至 1.30）介质中实现了 -10 dB 的发射抑制，且该抑制效果几乎与折射率对比度无关。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。