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Chiral transmission by an open evolution trajectory in a non-Hermitian system

Light(Science & Applications) 2024年第4期13卷 628-636页

作者： Xiaoqian Shu Qi Zhong Kai Hong Oubo You Jian Wang Guangwei Hu Andrea Alù Shuang Zhang demetrios n.christodoulides Lin Chen Wuhan national Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China. Zhejiang Lab Hangzhou 311121China. CREOL College of Optics and PhotonicsUniversity of Central FloridaOrlandoFlorida 32816USA. Department of Physics The University of Hong KongHong KongChina. School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore. Photonics Initiative Advanced Science Research CenterCity University of New YorkNew YorkNY 10031USA. Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518063China

Exceptional points(EPs),at which two or more eigenvalues and eigenstates of a resonant system coalesce,are associated with non-Hermitian Hamiltonians with gain and/or loss *** encircling of EPs has received significant interest in recent years,as it has been shown to lead to highly nontrivial phenomena,such as chiral transmission in which the final state of the system depends on the encircling ***,chiral transmission for a pair of eigenmodes has been realized by establishing a closed dynamical trajectory in parity-time-(PT-)or anti-PT-symmetric *** chiral transmission of symmetry-broken modes,more accessible in practical photonic integrated circuits,has been realized by establishing a closed trajectory encircling EPs in anti-PTsymmetric systems,the demonstrated transmission efficiency is very low due to path-dependent ***,we demonstrate chiral dynamics in a coupled waveguide system that does not require a closed ***,we explore an open trajectory linking two infinite points having the same asymptotic eigenmodes(not modes in PT-and anti-PT-symmetric systems),demonstrating that this platform enables high-efficiency chiral transmission,with each eigenmode localized in a single *** concept is experimentally implemented in a coupled silicon waveguide system at telecommunication *** work provides a new evolution strategy for chiral dynamics with superior performance,laying the foundation for the development of practical chiral-transmission devices.

关键词： chiral system symmetric

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Complex skin modes in non-Hermitian coupled laser arrays

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Light(Science & Applications) 2022年第12期11卷 3002-3007页

作者： Yuzhou G.n.Liu Yunxuan Wei Omid Hemmatyar Georgios G.Pyrialakos Pawel S.Jung demetrios n.christodoulides Mercedeh Khajavikhan Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCA 90089USA CREOL The College of Optics&PhotonicsUniversity of Central FloridaOrlandoFL 32816-2700USA Faculty of Physics Warsaw University of TechnologyKoszykowa 7500-662 WarsawPoland Department of Physics&Astronomy Dornsife College of LettersArts&SciencesUniversity of Southern CaliforniaLos AngelesCA 90089USA

From biological ecosystems to spin glasses,connectivity plays a crucial role in determining the function,dynamics,and resiliency of a *** the realm of non-Hermitian physics,the possibility of complex and asymmetric exchange interactions(|κ_(ij)|≠|κ_(ji)|)between a network of oscillators has been theoretically shown to lead to novel behaviors like delocalization,skin effect,and bulk-boundary *** archetypical lattice exhibiting the aforementioned properties is that proposed by Hatano and nelson in a series of papers in late *** the ramifications of these theoretical works in optics have been recently pursued in synthetic dimensions,the Hatano-nelson model has yet to be realized in real *** makes the implementation of these lattices challenging is the difficulty in establishing the required asymmetric exchange interactions in optical *** this work,by using active optical oscillators featuring non-Hermiticity and nonlinearity,we introduce an anisotropic exchange between the resonant elements in a lattice,an aspect that enables us to observe the non-Hermitian skin effect,phase locking,and near-field beam steering in a Hatano-nelson laser *** work opens up new regimes of phase-locking in lasers while shedding light on the fundamental physics of non-Hermitian systems.

关键词： Hermitian locking Complex

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Biophotonic rogue waves in red blood cell suspensions

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Photonics Research 2023年第11期11卷 1838-1846页

作者： YU-XUAn REn JOSHUA LAMSTEIn CHEnSOnG ZHAnG CLAUDIO COnTI demetrios nchristodoulides ZHIGAnG CHEn Institute for Translational Brain Research MOE Frontiers Center for Brain ScienceFudan UniversityShanghai 200032China Department of Physics and Astronomy San Francisco State UniversitySan FranciscoCalifornia 94132USA Center for Systems and Therapeutics Gladstone InstitutesSan FranciscoCalifornia 94158USA Division of CryoEM and Bioimaging Stanford Synchrotron Radiation LightsourceSLAC National Accelerator LaboratoryMenlo ParkCalifornia 94025USA Department of Physics University SapienzaI-00185 RomaItaly Department of Electrical Engineering University of Southern CaliforniaLos AngelesCalifornia 90089USA TEDA Applied Physics Institute and School of Physics Nankai UniversityTianjin 300457China

Rogue waves are ubiquitous in nature,appearing in a variety of physical systems ranging from acoustics,microwave cavities,optical fibers,and resonators to plasmas,superfluids,and Bose–Einstein *** nonlinear solitary waves,rogue waves are extreme events that can occur even without nonlinearity by,for example,spontaneous synchronization of waves with different spatial frequencies in a linear ***,we report the observation of rogue-wave-like events in human red blood cell(RBC)suspensions under weak light illumination,characterized by an abnormal L-shaped probability *** biophotonic extreme events arise mostly due to the constructive interference of Mie-scattered waves from the suspended RBCs,whose biconcave shape and mutable orientation give rise to a time-dependent random phase modulation to an incident laser *** numerically simulate the beam propagation through the colloidal suspensions with added disorder in both spatial and temporal domains to mimic random scattering due to Brownian *** addition,at high power levels,nonlinear beam self-focusing is also observed,leading to a dual-exponential probability distribution associated with the formation of multiple soliton-like *** rogue wave events should also exist in environments with cells of other species such as swimming bacteria,and understanding of their underlying physics may lead to unexpected biophotonic applications.

关键词： suspensions extreme soliton

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多艾里光束合成自聚焦光束的实验实现

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物理学报 2013年第3期62卷 180-185页

作者：张泽刘京郊张鹏倪培根 Prakash Jai 胡洋姜东升 christodoulides demetrios n 陈志刚哈尔滨工业大学航天学院可调谐激光国家重点实验室哈尔滨150001 旧金山州立大学物理与天文系美国94132 中弗罗里达大学光学与光子学学院美国32816 北京理工大学光电学院北京100081

多光束合成和单光束聚焦一直是提高激光束功率和功率密度的两个重要方法.结合艾里光束在自由空间中沿弯曲路径传播的特性,从数值模拟和实验两个方面,研究了利用多个一维艾里光束合成自由空间自聚焦光束的方法,并对所得到的模拟和实验结... 详细信息

多光束合成和单光束聚焦一直是提高激光束功率和功率密度的两个重要方法.结合艾里光束在自由空间中沿弯曲路径传播的特性,从数值模拟和实验两个方面,研究了利用多个一维艾里光束合成自由空间自聚焦光束的方法,并对所得到的模拟和实验结果进行了对比.采用分步束传播法,分别模拟了由四个和八个一维艾里光束合成的自聚焦光束在自由空间中的传播过程,给出了自聚焦光束在传播过程中横向和纵向的光强分布和变化趋势.采用计算全息和空间光调制器技术实验,实现了多个一维艾里光束合成的自聚焦光束.实验中分别测量了四个和八个一维艾里光束合成的自聚焦光束的横向光强分布.实验结果和理论结果符合得较好.另外,为了进一步增大自聚焦光束的功率,可以增加参与合成的一维艾里光束的数量.同时,自聚焦光束的焦距可以通过调整各个一维艾里光束的相对位置进行调节.

关键词：艾里光束自聚焦光束激光合成空间光调制

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Dispersive non-Hermitian optical heterostructures

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Photonics Research 2018年第4期6卷 I0001-I0005页

作者： O. V. SHRAMKOVA K. G. MAKRIS D. n. christodoulides G. P. TSIROnIS Research & Innovation Technicolor R&D France 975 avenue des Champs Blancs 35576 Cesson-Sevigne France CCQCn Department of Physics University of Crete P.O. Box 2208 71003 Heraklion Greece College of Optics & Photonics-CREOL University of Central Flonda Orlando Florida 32816 USA Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas P.O. Box 1527 71110 Heraklion Greece national University of Science and Technology MISiS Leninsky prosp. 4 Moscow 119049 Russia

The effect of material dispersion on the optical properties of one-dimensional non-Hermitian scattering systems is investigated in detail. In particular, multilayer heterostructures with gain and loss(parity-time symmetric or not)are examined by taking into account the dispersion of each layer. The exceptional points and phase transitions are characterized based on the spectrum of the corresponding scattering matrix. We demonstrate that an on-average lossy heterostructure can amplify an incident plane wave in the frequency range associated with the emission frequency of the layer with gain.

关键词：材料色散光学性质通讯技术技术创新

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Trapping aerosols with optical bottle arrays generated through a superposition of multiple Airy beams

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Chinese Optics Letters 2013年第3期11卷 84-86页

作者：张泽张鹏 Matthew Mills 陈志刚 D. n. christodoulides 刘京郊 national Key Laboratory of Tunable Laser Technology Harbin Institute of Technology Department of Physics and Astronomy San Francisco State UniversitySan Francisco CA 94132 USA nSF nanoscale Science and Engineering Center University of CaliforniaBerkeley CA 94720 USA CREOL/College of Optics University of Central FloridaOrlando Florida 32816 USA TEDA Applied Physics Schools Nankai University

We experimentally demonstrate the generation of an array of optical bottle beams by employing multiple self-accelerating Airy beams. This kind of optical bottle array is created by superimposing eight Airy beams along a circle, all with inward acceleration directed towards the center. In addition, we demonstrate stable trapping of multiple absorbing glassy carbon particles using the proposedoptical bottle array.

关键词： Optics Physics

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Bosonic discrete supersymmetry for quasi-two-dimensional optical arrays

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Photonics Research 2019年第11期7卷 1240-1243页

作者： Q.Zhong S.nelson M.Khajavikhan D.n.christodoulides R.El-Ganainy Department of Physics Michigan Technological UniversityHoughtonMichigan 49931USA Henes Center for Quantum Phenomena Michigan Technological UniversityHoughtonMichigan 49931USA College of Optics&Photonics-CREOL University of Central FloridaOrlandoFlorida 32816USA

We apply the notion of discrete supersymmetry based on matrix factorization to quantum systems consisting of coupled bosonic oscillators to construct isospectral bosonic quantum networks. By using the algebra that arises due to the indistinguishability of bosonic particles, we write down the Schr?dinger equations for these oscillators in the different boson-number sectors. By doing so, we obtain, for every partner quantum network, a system of coupled differential equations that can be emulated by classical light propagation in optical waveguide *** mathematical scheme allows us to build quasi-two-dimensional optical arrays that are either isospectral or share only a subset of their spectrum after deliberately omitting some chosen eigenstates from the spectrum. As an example, we use this technique(which we call bosonic discrete supersymmetry or BD-SUSY) to design two optical, silica-based waveguide arrays consisting of six and three elements, respectively, with overlapping eigenspectrum.

关键词： spectrum. symmetry quasi

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