Article
Materials Science, Multidisciplinary
Liyan Wang, Fanghua Liu, Fangmei Liu, Zhongli Qin, Yong Zhang, Dong Zhong, Hao Ni
Summary: The study explores the non-Hermiticity in PT-symmetric dielectric multilayers following the T-M sequence, which leads to the emergence of optical fractal phenomenon and exceptional points in transmission and reflection spectra. By increasing the gain-loss factor of dielectrics, the exceptional points split and degenerate, affecting the optical fractal states. This research opens up possibilities for applications in wavelength sensors and phase modulators.
Article
Physics, Multidisciplinary
Ziyao Feng, Xiankai Sun
Summary: In this study, we demonstrated the encircling of an exceptional point with a fixed loss rate in a compact anti-PT-symmetric integrated photonic system, achieving chiral mode switching within a shorter length compared to PT-symmetric systems. Based on this, we proposed a topologically protected mode (de)multiplexer that is robust against fabrication errors and operates over a wide wavelength range, with simplified fabrication and characterization processes.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Shiqiang Xia, Carlo Danieli, Yingying Zhang, Xingdong Zhao, Hai Lu, Liqin Tang, Denghui Li, Daohong Song, Zhigang Chen
Summary: The study proposes a scheme to realize PT symmetric photonic Lieb lattices, demonstrating higher-order EP and LZB oscillations with a refractive index gradient. The spectra of quasi-one-dimensional Lieb lattices have real values when the index gradient is perpendicular to the ribbon, while interesting characteristics like asymmetric energy transition and pseudo-Hermitian propagation are observed when the index gradient is parallel to the ribbon.
Article
Optics
D. Kaltsas, I. Komis, K. G. Makris
Summary: This paper presents a systematic method to construct infinite optical waveguide lattices that exhibit higher order exceptional points. The spectral properties and sensitivity of these lattices around such points are investigated using the pseudospectra method.
Article
Optics
Yanyan He, Jinze Wu, Yaodong Hu, Jun-Xiang Zhang, Shi-Yao Zhu
Summary: We experimentally demonstrate an anti-PT-symmetric photonic lattice in thermal cesium atoms driven by two standing-wave laser fields. By manipulating the intensities and phases of the two standing-wave fields, we observe unidirectional reflectionless propagation at the exceptional points. Our work provides a platform to study the scattering property of anti-PT-symmetric systems.
Article
Chemistry, Multidisciplinary
Yi-Jun Chang, Yong-Heng Lu, Ying-Yue Yang, Yao Wang, Wen-Hao Zhou, Xiao-Wei Wang, Xian-Min Jin
Summary: This study experimentally demonstrates the inhibition and reconstruction of Zener tunneling in photonic honeycomb lattices. By structurally controlling Zener tunneling, the coherence of photons is protected, paving the way for flexible quantum engineering of large-scale artificial quantum materials.
ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
K. Komagata, A. Tusnin, J. Riemensberger, M. Churaev, H. Guo, A. Tikan, T. J. Kippenberg
Summary: This paper analyzes the role of exceptional points in nonlinear multimode photonics, specifically examining the complex nonlinear dynamics in a continuous wave-driven pair of strongly coupled microresonators. The study demonstrates mechanisms of dissipative Kerr soliton formation in two fundamentally different regimes separated by a line of exceptional points, highlighting the diverse emergent nonlinear effects such as the on-demand generation of single-solitons, perfect soliton crystals, and bright-dark soliton pairs.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Yanghao Fang, Tsampikos Kottos, Ramathasan Thevamaran
Summary: The research introduces a class of parity-time symmetric elastodynamic metamaterials with unfolding (fractal) spectral symmetries, revealing a scale-free formation of exceptional points. By using finite element models and a coupled mode theory model, the study establishes a universal route for exceptional point formation in Ed-MetaMaters with specific fractal spectra, which may enable the rational design of novel Ed-MetaMater for hypersensitive sensing and elastic wave control.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Lucas J. Fernandez-Alcazar, Rodion Kononchuk, Tsampikos Kottos
Summary: The proposal introduces a family of autonomous motors that rely on exceptional points for high efficiency and maximum work, showing potential applications in photonic systems for micro-robots and microfluidic pumps in biological environments. These designs can also be implemented with electromechanical elements to harvest ambient mechanical noise for powering auxiliary systems.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Tiecheng Wang
Summary: We reveal that a special exceptional point can act as a Dirac point in a one-dimensional system.
NEW JOURNAL OF PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Zhicheng Xiao, Andrea Alu
Summary: The study explores a hybrid parity-time and anti-parity-time symmetric system that supports highly tunable Fano resonances. This system can be implemented in nanophotonic and microwave circuits for real-time control of scattering line shapes, demonstrating the opportunities enabled by non-Hermitian platforms in controlling scattering line shapes for various photonic, electronic, and quantum systems. The potential applications include high-resolution imaging, switching, sensing, and multiplexing.
Article
Optics
Kenta Takata, Kengo Nozaki, Eiichi Kuramochi, Shinji Matsuo, Koji Takeda, Takuro Fujii, Shota Kita, Akihiko Shinya, Masaya Notomi
Summary: This study presents the first non-Hermitian nanophotonic platform, demonstrating spontaneous emission at exceptional points (EPs) through systematic tuning and independent current injection, revealing a clear EP phase transition and unique spectral features.
Article
Physics, Applied
Kaiyun Zhan, Tingjun Zhao, Qixuan Chen, Qian Zhang, Xinyue Kang
Summary: The study demonstrates that photonic lattices can support optical Zitterbewegung motion with controllable oscillation amplitude. The nonorthogonality of the Floquet-Bloch modes imposed by the non-Hermitian nature of the dynamics significantly affects the wave oscillation dynamics, with the phenomenon showing robustness to perturbations of the gain parameter.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Rafi Ud Din, Amin Ur Rashid, Hazrat Ali, Xiaodong Zeng, Ghaus Ur Rehman
Summary: This study investigates the properties of surface plasmon polaritons (SPPs) at the interface between a metal and an optical lattice, using cold rubidium atoms. The findings show that under certain conditions, the backscattering and modes of SPPs can be improved significantly. These results are significant for low-loss plasmonic routers and lasers.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Materials Science, Multidisciplinary
Shenyi Gao, Limin Song, Wenchao Yan, Yichi Wang, Shiqi Xia, Liqin Tang, Daohong Song, Jingjun Xu, Zhigang Chen
Summary: This study demonstrates a photonic honeycomb lattice with two singular flat bands, showing two distinct robust boundary modes associated with each flat band. These findings provide an important model platform for studying flatband phenomena and topological insulating phases in optics and other fields.
ADVANCED OPTICAL MATERIALS
(2022)
