Article
Optics
Yingfang Zhang, Zhihao Lan, Liyazhou Hu, Yiqing Shu, Xun Yuan, Penglai Guo, Xiaoling Peng, Weicheng Chen, Jianqing LI
Summary: In this work, the existence of chiral topological electromagnetic edge states in Penrose-tiled photonic quasicrystals made of magneto-optical materials is demonstrated, without relying on the concept of bulk Bloch bands in momentum space. Despite the absence of bulk Bloch bands, some bandgaps in these photonic quasicrystals still could host unidirectional topological electromagnetic edge states immune to backscattering. Employing a real-space topological invariant based on the Bott index, it is shown that the bandgaps hosting these chiral topological edge states possess a nontrivial Bott index, depending on the direction of the external magnetic field. This work opens new possibilities for the study of topological states in photonic quasicrystals.
Article
Optics
Jiale Yuan, Chenran Xu, Han Cai, Da-Wei Wang
Summary: The proposed scheme efficiently transfers photons in a scalable one-dimensional waveguide array by transporting the topological defect state of a Su-Schrieffer-Heeger model, using a constant energy gap for protected excitation transfer. Additionally, quasi-periodic oscillations induced by the non-adiabatic effect can further speed up the transport process.
Article
Multidisciplinary Sciences
Eran Lustig, Lukas J. Maczewsky, Julius Beck, Tobias Biesenthal, Matthias Heinrich, Zhaoju Yang, Yonatan Plotnik, Alexander Szameit, Mordechai Segev
Summary: The article introduces a method for achieving three-dimensional topological surface states in photonics, transforming a two-dimensional photonic waveguide array into a three-dimensional topological system by introducing the concepts of screw dislocation and synthetic dimensions, demonstrating protected edge state propagation in three dimensions.
Review
Physics, Multidisciplinary
Jiahao Fan, Huaqing Huang
Summary: This review summarizes the recent progress of topological states in quasicrystals, with a focus on one-dimensional and two-dimensional systems. In one-dimensional quasicrystals, the topological nature is attributed to the quasiperiodic order. In two-dimensional quasicrystals, real-space expressions are introduced to describe topological invariants due to the lack of translational symmetry. The unique quasicrystalline symmetry-protected topological states without crystalline counterpart are also discussed.
FRONTIERS OF PHYSICS
(2022)
Article
Optics
Kazuhiro Kuruma, Hironobu Yoshimi, Yasutomo Ota, Ryota Katsumi, Masahiro Kakuda, Yasuhiko Arakawa, Satoshi Iwamoto
Summary: This study reports single-photon sources using single quantum dots embedded in topological slow light waveguides based on valley photonic crystals. The experiment demonstrates Purcell-enhanced single-photon emission in a topological slow light mode with a group index over 20, showing robust propagation even under sharp bends.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Limin Song, Yuqing Xie, Shiqi Xia, Liqin Tang, Daohong Song, Jun-Won Rhim, Zhigang Chen
Summary: Noncontractible loop states (NLSs) are demonstrated in a system with isolated plane-touching flat bands. The conditions for the existence of NLSs are analyzed, and their existence is experimentally observed in a laser-written Corbino-shaped fractal-like lattice. This work provides a deep understanding of nontrivial flatband states and opens up new avenues for exploring fundamental phenomena.
LASER & PHOTONICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Rasoul Ghadimi, Takanori Sugimoto, K. Tanaka, Takami Tohyama
Summary: In this study, the realization of non-Abelian topological superconductivity in two-dimensional quasicrystals through the same mechanism as in crystalline counterparts is proposed and confirmed through various observations. The presence of topological superconductivity with broken time-reversal symmetry in both Penrose and Ammann-Beenker quasicrystals was shown, along with the existence of unique features like zero-energy bound states and Majorana zero modes. These findings indicate the non-Abelian character of the system when the Bott index is unity.
Article
Optics
Sai Yan, Jingnan Yang, Shushu Shi, Zhanchun Zuo, Can Wang, Xiulai Xu
Summary: We propose a design for integrated optical devices on-chip using a photonic crystal waveguide that has an extra width degree of freedom. By introducing Dirac points between two photonic crystals with opposite valley Chern numbers, we demonstrate the topologically protected photonic waveguide with an extra waveguide retains the properties of valley-locking and immunity to defects. The flexibility of the width-tunable topologically protected photonic waveguide enables the proposal of unique on-chip integrated devices, such as energy concentrators with a significant concentration efficiency improvement and a topological photonic power splitter with an arbitrary power splitting ratio. The topologically protected photonic waveguide with the width degree of freedom is beneficial for scaling up photonic devices and providing a flexible platform for implementing integrated photonic networks on-chip.
PHOTONICS RESEARCH
(2023)
Article
Optics
Meng Li, Chu Li, Linyu Yan, Qiang Li, Qihuang Gong, Yan Li
Summary: This paper reports the experimental realization of fractal photonic anomalous Floquet topological insulators, in which a lattice composed of dual Sierpinski carpet is fabricated using femtosecond laser direct writing. The fabricated lattice supports multiple chiral edge states and enables efficient hopping of quantum states. The generation of highly indistinguishable single-photon chiral edge states in the fractal lattice suggests its potential applications in various quantum operations and encoding of quantum information.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Qiaolu Chen, Li Zhang, Fujia Chen, Qinghui Yan, Rui Xi, Hongsheng Chen, Yihao Yang
Summary: The study introduces the research status and applications of photonic topological valley kink states, showing the effect of designing topological valley-locked waveguides with tunable mode widths. The research demonstrates the potential for unique applications in photon waveguides and devices.
Article
Optics
Sonakshi Arora, Thomas Bauer, Rene Barczyk, Ewold Verhagen, L. Kuipers
Summary: Topological on-chip photonics based on tailored photonic crystals that mimic quantum valley-Hall effects has gained interest for its potential in robust unidirectional transport of classical and quantum information. Experimental evaluation of topological photonic edge eigenstates using phase-resolved near-field optical microscopy demonstrates that protected edge states are two orders of magnitude more robust than modes of conventional photonic crystal waveguides, offering potential for error-free photonic quantum networks in integrated photonics.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Francis Segovia-Chaves, Youssef Trabelsi, T. A. Taha
Summary: The transfer matrix method is used to calculate the transmission spectra in one-dimensional photonic quasicrystal (1D-PQ) coupling via a superconducting cavity. Multichannel filter in the near-infrared spectral region is obtained due to the existence of localized modes with an increasing Fibonacci sequence in the proposed heterostructure. The proposed heterostructure operates in cryogenic temperature environments and is expected to be integrated into the optoelectronic circuit design.
Article
Optics
Hongxian Shao, Yueke Wang, Guofeng Yang, Tian Sang
Summary: We propose a heterogeneous structure that consists of two valley photonic crystals (VPCs) with opposite valley Chern numbers and an air channel. By analyzing energy bands, we discover valley-locked waveguide modes in the topological bandgap as the air channel width increases. Finite element method (FEM) simulations show that these modes propagate unidirectionally and possess higher flux compared to the valley-locked topological edge state in the domain wall. We also discuss the immunity to backscattering in bend and couplers, as well as the robustness to random disorders. Furthermore, we investigate the one-way multimode interference (MMI) effect based on valley-locked waveguide modes and design topological beam splitters.
Article
Multidisciplinary Sciences
Sebastian Weidemann, Mark Kremer, Stefano Longhi, Alexander Szameit
Summary: Phase transitions in non-Hermitian quasicrystals can be mutually interlinked, and the intertwinement of symmetry breaking, topology, and mobility phase transitions is observed in this study using photonic quantum walks.
Article
Physics, Applied
Z. Yu, H. Lin, R. Zhou, Z. Li, Z. Mao, K. Peng, Y. Liu, X. Shi
Summary: Progress in the study of two-dimensional materials has shown that valleys, as energy extrema in a hexagonal first Brillouin zone, offer a new degree of freedom for manipulating information. This paper proposes a two-dimensional valley crystal composed of tunable dielectric triangular pillars and establishes selection rules for valley-polarized states. Experimental results demonstrate the strong transmission capabilities of topologically protected edge states at sharp corners, providing a feasible approach for the development of valley photonic devices in the THz regime.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Marius Jurgensen, Sebabrata Mukherjee, Mikael C. Rechtsman
Summary: The topological protection of wave transport can apply broadly to different physical platforms and may behave differently in non-linear cases, where quantized transport can still be induced. The concept of a Thouless pump in a one-dimensional model captures the topological quantization of transport, showing that nonlinearity and interactions can induce quantized topological behavior in wave systems.
Article
Optics
Christina Joerg, Sachin Vaidya, Jiho Noh, Alexander Cerjan, Shyam Augustine, Georg von Freymann, Mikael C. Rechtsman
Summary: Weyl points are point degeneracies in the momentum space of 3D periodic materials, associated with a quantized topological charge. This study experimentally observed the splitting of a quadratic Weyl point into two linear Weyl points in a 3D micro-printed photonic crystal. The theoretical analysis showed that this splitting occurs along high-symmetry directions in the Brillouin zone, which is important for the development of robust topological devices in the near-infrared.
LASER & PHOTONICS REVIEWS
(2022)
Article
Physics, Multidisciplinary
Marius Juergensen, Mikael C. Rechtsman
Summary: The research reveals that under low-power conditions, the transport of nonlinear Thouless pumps for bosons is influenced by the Chern number of the soliton-separated band. By expanding the equation on the basis of Wannier states, it is demonstrated that the position of the soliton is determined by the position of the Wannier state throughout the pump cycle. Furthermore, soliton pumping in two dimensions is described.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Konrad Tschernig, Gabriel Martinez-Niconoff, Kurt Busch, Miguel A. Bandres, Armando Perez-Leija
Summary: Topological physics is utilized to create systems with unique wave-guiding properties. Photonic topological insulators have been developed to enable topologically protected light states that propagate along the system's edge without coupling into the bulk or backscattering. This study explores the interplay between topological protection and the degree of spatial coherence in classical light propagating in disordered photonic topological insulators, finding that there exists a well-defined spectral window in which partially coherent light is topologically protected.
PHOTONICS RESEARCH
(2022)
Editorial Material
Optics
Miguel A. Bandres, Oded Zilberberg, Andrey Sukhorukov
Article
Optics
Daniel Cruz-Delgado, Stephanos Yerolatsitis, Nicolas K. Fontaine, Demetrios N. Christodoulides, Rodrigo Amezcua-Correa, Miguel A. Bandres
Summary: In this article, we demonstrate a versatile approach to synthesize convoluted ultrafast light structures in which the spatial and temporal dimensions are precisely correlated. By utilizing a two-stage reconfigurable module, we generate separable and non-separable trains of ultrafast wavepackets with time-varying dynamic angular momentum and tailored spectral characteristics.
Article
Physics, Multidisciplinary
Marius Jurgensen, Sebabrata Mukherjee, Christina Jorg, Mikael C. Rechtsman
Summary: In many contexts, particle interactions can result in emerging phenomena. For example, the interaction between electrons leads to the fractional quantum Hall effect. In photonic systems, the nonlinear response of a medium mediates the interaction between photons, described by the nonlinear Schrodinger equation. Our study demonstrates that a strong nonlinearity can fractionally quantize soliton motion, leading to a rich fractional plateau structure.
News Item
Optics
Mikael C. Rechtsman
Summary: Topological photonics offers the potential for new devices with reduced backscattering, resulting in lower loss, higher nonlinearity, and smaller size. Recent research has shown that in reciprocal photonic crystals, backscattering cannot be avoided, highlighting the importance of breaking reciprocity for the development of photonic Chern insulators.
Article
Materials Science, Multidisciplinary
Wladimir A. Benalcazar, Jiho Noh, Mohan Wang, Sheng Huang, Kevin P. Chen, Mikael C. Rechtsman
Summary: This article demonstrates the topological nontriviality of adiabatic cycles in 2D crystals with zero overall particle transport, and diagnoses this topology through corner-to-corner transport. The experimental verification of corner-to-corner transport associated with this topological pump is provided.
Proceedings Paper
Engineering, Electrical & Electronic
Sebabrata Mukherjee, Mikael C. Rechtsman
Summary: The study demonstrates the first realization of soliton-like unidirectional edge modes on photonic Floquet topological insulators. These modes radiate power at a finite and controllable rate due to the intrinsic gaplessness of the topological spectrum.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Alexander Cerjan, Christina Jorg, Wladimir A. Benalcazar, Sachin Vaidya, Chia Wei Hsu, Georg von Freymann, Mikael C. Rechtsman
Summary: We demonstrate that photonic-crystal environments can generate symmetry-specific bandgaps that accommodate a wide variety of symmetry-protected lines of bound states in the continuum, which we prove to be impossible in homogeneous environments.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Christina Joerg, Sachin Vaidya, Jiho Noh, Alexander Cerjan, Shyam Augustine, Georg von Freymann, Mikael C. Rechtsman
Summary: In this experiment, we demonstrated the splitting of a charge-2 Weyl point into two charge-1 Weyl points in a 3D micro-printed photonic crystal. The angle-resolved spectrum was measured in the near-infrared using Fourier-transform infrared spectroscopy.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Marius Jurgensen, Sebabrata Mukherjee, Mikael Rechtsman
Summary: Researchers theoretically propose and experimentally demonstrate quantized nonlinear Thouless pumping, despite non-uniform occupation of topological bands; the effect has no analogue in the linear domain. The effect is observed in arrays of coupled waveguides.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Marius Jurgensen, Sebabrata Mukherjee, Mikael Rechtsman
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Alexander Cerjan, Christina Jorg, Wladimir A. Benalcazar, Sachin Vaidya, Chia Wei Hsu, Georg von Freymann, Mikael C. Rechtsman
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
