Article
Materials Science, Multidisciplinary
Ying Chen, Ze-Huan Zheng, Hai-Xiao Wang, Feng Wu, Huanyang Chen
Summary: We design bilayer mirror-symmetric photonic crystal slabs (I-shaped) that support dual-band topological edge states simultaneously, confirmed by topological phases and localized field distributions. By adjusting the coupling strengths at different positions of the I-shaped structure, the band structures can exhibit different topology in different frequency bands, enabling flexible emergence of dual-band or single-band edge states at two or one band gaps, respectively. Furthermore, we investigate the influence of broken mirror symmetry Mz on the dual-band states. This study offers a promising approach to realize multiband topological states and enhance the efficiency of robust light transport.
RESULTS IN PHYSICS
(2023)
Article
Optics
Shaolin Ke, Wanting Wen, Dong Zhao, Yang Wang
Summary: The non-Hermitian skin effect (NHSE) reveals unprecedented topological physics by collapsing bulk modes to open boundaries as skin modes. Achieving this effect in photonic waveguides has been challenging due to the difficulty of establishing non-Hermitian asymmetric couplings. In this study, NHSE in photonic waveguide arrays is investigated via Floquet engineering, creating an artificial gauge field (AGF) that interacts with on-site dissipation, resulting in NHSE.
Article
Materials Science, Multidisciplinary
Francis Segovia-Chaves, Herbert Vinck-Posada, E. Petrovish Navarro-Baron
Summary: This paper calculates the local density of states in a defective one-dimensional photonic crystal composed of alternating air and semiconductor layers, finding that increased pressure affects the density of confined modes. The results show that GaAs cavities exhibit a higher number of confined modes with increased pressure.
RESULTS IN PHYSICS
(2022)
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.
Article
Physics, Multidisciplinary
Liat Nemirovsky, Moshe-Ishay Cohen, Yaakov Lumer, Eran Lustig, Mordechai Segev
Summary: Synthetic-space topological insulators are topological systems where at least one spatial dimension is replaced by a periodic arrangement of modes. These systems can enrich the physics of topological insulators by enabling higher dimensions and nonlocal coupling. This new mechanism can be realized in photonics and cold atoms, showcasing robust unidirectional propagation in the presence of defects and disorder.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Yongkang Gong, Liang Guo, Stephan Wong, Anthony J. Bennett, Sang Soon Oh
Summary: In this study, a photonic topological insulator strategy based on SSH photonic crystal nanobeam cavities is developed to tailor TESs by manipulating mode coupling in a two-dimensional manner. It is revealed that hole-array based nanobeams in a dielectric membrane can selectively tailor single or double TESs in the telecommunication region by controlling the coupling strength of the adjacent SSH nanobeams in both transverse and axial directions. This finding provides an additional degree of freedom in exploiting the SSH model for integrated topological photonic devices and functionalities on established photonic crystal nanobeam cavity platforms.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Shirong Lin, Luojia Wang, Luqi Yuan, Xianfeng Chen
Summary: This study introduces an alternative method to realize an artificial magnetic field in the frequency dimension using cross-phase modulation in a one-dimensional four-waveguide array. The dynamics of the topological chiral edge state and the influence of pump field crosstalk have been explored.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Chao Chen, Run-Ze Liu, Jizhou Wu, Zu-En Su, Xing Ding, Jian Qin, Lin Wang, Wei-Wei Zhang, Yu He, Xi-Lin Wang, Chao-Yang Lu, Li Li, Barry C. Sanders, Xiong-Jun Liu, Jian-Wei Pan
Summary: In this study, we reconstruct the Berry curvature in a photonic quantum anomalous Hall system through Hall transport measurements. By integrating the measured Berry curvature, we obtain the corresponding Chern numbers and verify the bulk-boundary correspondence by measuring chiral edge states. This research provides an important platform for further studying novel topological physics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Xing-Xiang Wang, Zhiwei Guo, Juan Song, Haitao Jiang, Hong Chen, Xiao Hu
Summary: We revealed the unique electromagnetic transport properties of a topological photonic crystal, which is originated from the Dirac frequency dispersion and multicomponent spinor eigenmodes. By precisely measuring the local Poynting vectors in microstrips of honeycomb structure, we showed that a chiral wavelet induces a global electromagnetic transportation circulating in the direction counter to the source, which is intimately related to the topological band gap specified by a negative Dirac mass. This brand-new Huygens-Fresnel phenomenon can be considered as the counterpart of negative refraction of electromagnetic plane waves associated with upwardly convex dispersions of photonic crystals, and our present finding is expected to open a new window for photonic innovations.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Xiao-Liu Chu, Camille Papon, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Nir Rotenberg, Peter Lodahl
Summary: Efficient light-matter interaction at the single-photon level is achieved by coupling two semiconductor quantum dot emitters to a photonic-crystal waveguide and individually controlling them using a local electric Stark field. Resonant transmission and fluorescence spectra confirm the coupling of the two emitters to the waveguide. The single-photon stream from one quantum dot is utilized for spectroscopy on the second quantum dot positioned 16 μm away, and power-dependent resonant transmission measurements indicate coherent coupling between the emitters. This work presents a scalable route to achieve multiemitter collective coupling for solid-state deterministic photon emitters.
PHYSICAL REVIEW LETTERS
(2023)
Review
Physics, Multidisciplinary
Jianfeng Chen, Zhi-Yuan Li
Summary: This paper reviews the fundamental physics, novel properties, and practical applications of topological photonic states (TPSs) based on gyromagnetic photonic crystals (GPCs). Various types of TPSs are examined, and the coupling effect between TPSs is discussed. Future development trends are also analyzed.
Article
Optics
Hongwei Wang, Guojing Tang, Yu He, Zhen Wang, Xingfeng Li, Lu Sun, Yong Zhang, Luqi Yuan, Jianwen Dong, Yikai Su
Summary: In this study, the phase-shifting theory of topological edge modes based on valley photonic crystals (VPCs) is investigated, leading to the demonstration of an ultracompact thermo-optic topological switch (TOTS) with high-efficiency phase-shifting properties and sharp-turn features. The research findings are significant for the development of topological functional devices in the fields of optical communications, nanophotonics, and quantum information processing.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
Christian Leefmans, Avik Dutt, James Williams, Luqi Yuan, Midya Porto, Franco Nori, Shanhui Fan, Alireza Marandi
Summary: This study reveals the emergence of non-trivial topological invariants in dissipatively coupled systems, opening up new opportunities for dissipative engineering and future research in synthetic dimensions.
Article
Materials Science, Multidisciplinary
Faezeh Pirmoradian, MirFaez Miri, Babak Zare Rameshti, Shahpoor Saeidian
Summary: We investigate the topological properties of a bipartite chain of magnetic spheres in a metallic waveguide. The chain, coherently coupled via the waveguide mode, exhibits two distinct phases distinguished by the Zak phase. In the presence of strong intercoupling, a finite chain supports doubly degenerate topological edge states within the gap, showing the preservation of the bulk-edge correspondence despite the strong coupling to the waveguide mode. The nontrivial (trivial) topological phase is determined by the intracell and intercell coupling of magnetic spheres, which depend on the separation, external magnetic inductions, and waveguide dimensions. Magnetically tunable topological magnon modes could enable novel topological photonic devices.
Article
Physics, Multidisciplinary
Guo-Chao Wei, Zhen-Zhen Liu, Da-Sen Zhang, Jun-Jun Xiao
Summary: This study focuses on introducing edge states in topological photonic crystals by constructing interfaces with distinct topological phases to achieve two topological protected bandgaps for flexible wave routing. The routing path of valley edge states highly depends on the operating frequency and inputting port of the excitation source in different meta-structures, providing an alternative way to design topological devices such as wave splitters and frequency division devices.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Atefeh Shadmani, Rodrigo A. Thomas, Zhe Liu, Camille Papon, Martijn J. R. Heck, Nicolas Volet, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Peter Lodahl, Leonardo Midolo
Summary: We present a method for integrating GaAs waveguide circuits containing self-assembled quantum dots on a Si/SiO2 wafer using die-to-wafer bonding. The large refractive-index contrast between GaAs and SiO2 allows the fabrication of single-mode waveguides without compromising the photon-emitter coupling. We observe anti-bunched emission from individual quantum dots and achieve a waveguide propagation loss of <7 dB/mm, which is comparable to the performance of suspended GaAs circuits. These results enable the integration of quantum emitters with different material platforms, paving the way for scalable quantum photonic integrated circuits.
Article
Physics, Multidisciplinary
G. Arregui, R. C. Ng, M. Albrechtsen, S. Stobbe, C. M. Sotomayor-Torres, P. D. Garcia
Summary: Confining photons in cavities enhances the interaction between light and matter. We have demonstrated how sidewall roughness in air-slot photonic-crystal waveguides can induce Anderson-localized modes with high quality factors and mode volumes below the diffraction limit. The interaction between these disorder-induced optical modes and in-plane mechanical modes is governed by a distribution of coupling rates, leading to mechanical amplification via optomechanical backaction. This study opens up new possibilities for exploring complex systems with mutually coupled degrees of freedom.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Alexey Tiranov, Vasiliki Angelopoulou, Bjorn Schrinski, Cornelis Jacobus van Diepen, Oliver August Dall Alba Sandberg, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas Dirk Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: Photon emission is fundamental for light-matter interaction and photonic quantum science. This study demonstrates distant dipole-dipole radiative coupling in solid-state optical quantum emitters embedded in a nanophotonic waveguide. The collective response and emission dynamics can be controlled by proper excitation techniques. This work is a foundational step towards multiemitter applications for scalable quantum-information processing.
Article
Nanoscience & Nanotechnology
Melissa J. Goodwin, Cornelis A. M. Harteveld, Meint J. de Boer, Willem L. Vos
Summary: Periodic arrays of deep nanopores in silicon are important for silicon nanophotonics. Previous studies focused on achieving deep nanopores with high aspect ratios, but resulted in structural imperfections. This study aims to realize cylindrical nanopores for better comparison with theory and simulations. By optimizing etching parameters and implementing a multistep process, cylindrical nanopores with high aspect ratios were achieved, suitable for silicon nanophotonic structures.
Article
Optics
Christian Anker Rosiek, Guillermo Arregui, Anastasiia Vladimirova, Marcus Albrechtsen, Babak Vosoughi Lahijani, Rasmus Ellebaek Christiansen, Soren Stobbe
Summary: This study investigates the practical value of topological protection in reciprocal photonics. Measurements of propagation losses in valley-Hall topological waveguides in the slow-light regime show no evidence of topological protection against backscattering on structural defects. Light's unique properties support the development of photonic quantum technologies, optical interconnects, and novel sensors, but losses due to absorption or backscattering are a key limitation.
Article
Optics
Soren Engelberth Ansen, Guillermo Arregui, Ali Nawaz Babar, Marcus Albrechtsen, Babak Vosoughi Lahijani, Rasmus Ellebaek Christiansen, Soren Stobbe
Summary: We designed and fabricated a grating coupler that can interface suspended silicon photonic membranes with free-space optics in a single-step lithography and etching process in 220 nm silicon device layers. The coupler design achieved high transmission and low reflection by combining two-dimensional shape optimization and three-dimensional parameterized extrusion. The experimentally verified coupler had a transmission of -6.6 dB (21.8%), a 3 dB bandwidth of 75 nm, and a reflection of -27 dB (0.2%).
Article
Optics
Marek Kozon, Rutger Schrijver, Matthias Schlottbom, Jaap J. W. van der Vegt, Willem L. Vos
Summary: This study proposes a rigorous method to classify the dimensionality of wave confinement by utilizing unsupervised machine learning, aiming to enhance the accuracy of the recently presented scaling method. The standard k-means++ algorithm and a model-based algorithm are applied to 3D superlattices of resonant cavities embedded in a 3D inverse woodpile photonic band gap crystal. The results are compared with each other and with the direct usage of the scaling method without clustering. Cluster validity indices are investigated to find the set of confinement dimensionalities present in the system. The study concludes that the most accurate outcome is obtained by first applying direct scaling and subsequently utilizing a model-based clustering algorithm.
Article
Physics, Multidisciplinary
Guilhem Madiot, Ryan C. Ng, Guillermo Arregui, Omar Florez, Marcus Albrechtsen, Soren Stobbe, Pedro D. Garcia, Clivia M. Sotomayor-Torres
Summary: This study investigates the optomechanical generation of coherent phonons at 6.8 GHz frequency, operating at room temperature. By using a suspended 2D silicon phononic crystal cavity with an air-slot, the phononic waveguide is turned into an optomechanical platform that allows for fine control of phonons using light. This development could potentially lead to the advancement of phononic circuitry and coherent manipulation of other solid-state properties.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Ming Lai Chan, Alexey Tiranov, Martin Hayhurst Appel, Ying Wang, Leonardo Midolo, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Anders Sondberg Sorensen, Peter Lodahl
Summary: We have demonstrated high-fidelity on-chip entanglement between an incoming photon and a stationary quantum-dot hole spin qubit using self-assembled quantum dots integrated into nanostructures. The entanglement is induced by sequential scattering of the time-bin encoded photon interleaved with active spin control within a microsecond, two orders of magnitude faster than other solid-state platforms. The entanglement fidelity is immune to the spectral wandering of the emitter when conditioned on the detection of a reflected photon. These results represent a major step towards realizing a quantum node capable of interchanging information with flying photons and on-chip quantum logic for quantum networks and repeaters.
NPJ QUANTUM INFORMATION
(2023)
Article
Multidisciplinary Sciences
Patrik I. Sund, Emma Lomonte, Stefano Paesani, Ying Wang, Jacques Carolan, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Wolfram H. P. Pernice, Peter Lodahl, Francesco Lenzini
Summary: Scalable photonic quantum computing requires low-loss high-speed reconfigurable circuits and near-deterministic resource state generators. In this study, we developed an integrated photonic platform based on thin-film lithium niobate and combined it with deterministic solid-state single-photon sources based on quantum dots in nanophotonic waveguides. The generated photons were processed using low-loss circuits programmable at speeds of several gigahertz, enabling various key photonic quantum information processing functionalities. This approach shows promise for scalable photonic quantum technologies by merging integrated photonics with solid-state deterministic photon sources.
Article
Physics, Multidisciplinary
Xiao-Liu Chu, Camille Papon, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Nir Rotenberg, Peter Lodahl
Summary: Efficient light-matter interaction at the single-photon level is achieved by coupling two semiconductor quantum dot emitters to a photonic-crystal waveguide and individually controlling them using a local electric Stark field. Resonant transmission and fluorescence spectra confirm the coupling of the two emitters to the waveguide. The single-photon stream from one quantum dot is utilized for spectroscopy on the second quantum dot positioned 16 μm away, and power-dependent resonant transmission measurements indicate coherent coupling between the emitters. This work presents a scalable route to achieve multiemitter collective coupling for solid-state deterministic photon emitters.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
C. Papon, Y. Wang, R. Uppu, S. Scholz, A. D. Wieck, A. Ludwig, P. Lodahl, L. Midolo
Summary: We achieve on-chip single-photon generation in multiple spatial modes by resonantly exciting two quantum dots in a photonic integrated circuit. The emission wavelength of the two quantum dots is tuned to be the same using isolated p-i-n junctions, and they are excited by a resonant pump laser via dual-mode waveguides. Under continuous-wave excitation of narrow-linewidth quantum dots, we demonstrate a two-photon quantum interference visibility of (79 ± 2)%. Our work solves a significant challenge in quantum photonics by realizing how to scale up deterministic single-photon sources.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Eva M. Gonzalez-Ruiz, Freja T. Ostfeldt, Ravitej Uppu, Peter Lodahl, Anders S. Sorensen
Summary: We analyzed the entanglement properties of deterministic path-entangled photonic states generated by coupling the emission of a quantum-dot biexciton cascade to a chiral nanophotonic waveguide. Our analysis considered realistic experimental imperfections, such as imperfect chiral emitter-photon interactions and asymmetric coupling of exciton levels due to fine-structure splitting, along with time jitter in photon detection. The results showed that this approach offers a promising platform for generating entanglement in integrated nanophotonic systems despite the presence of these imperfections.
Article
Optics
Xiao-Liu Chu, Vasiliki Angelopoulou, Peter Lodahl, Nir Rotenberg
Summary: The study found that as dephasing increases, the signatures of subradiance quickly vanish in intensity measurements, yet remain pronounced in photon correlation measurements, especially when the two emitters are pumped separately to efficiently populate the subradiant state. The work provides a route to experimentally realize subradiant states in nanophotonic waveguides with solid-state emitters by using the applied Green's tensor approach.
Article
Optics
Eva M. Gonzalez-Ruiz, Sumanta K. Das, Peter Lodahl, Anders S. Sorensen
Summary: This paper investigates the possibility of violating Bell's inequality using deterministic single-photon sources. A detailed analysis of a scheme for achieving such violations over long distances is provided, with immediate extensions to device-independent quantum key distribution. The effects of experimental imperfections on real-world single-photon sources are also investigated. The performance requirements for state-of-the-art deterministic single-photon sources based on quantum dots are benchmarked, and it is found that experimental realizations seem to be feasible. The requirements for a postselected version of the protocol are also evaluated.
