Article
Optics
Liangwei Zeng, Milivoj R. Belic, Dumitru Mihalache, Dan Xiang, Qing Wang, Jianrong Yang, Xing Zhu
Summary: We demonstrate novel triangular bright solitons supported by the nonlinear Schrodinger equation with inhomogeneous Kerr-like nonlinearity and external harmonic potential, which can be realized in nonlinear optics and Bose-Einstein condensates. The profiles of these solitons differ from common Gaussian or sech envelope beams, with tops and bottoms resembling triangle and inverted triangle functions. Self-defocusing nonlinearity leads to triangle-up solitons, while self-focusing nonlinearity supports triangle-down solitons. The stability of these lowest-order fundamental triangular solitons is confirmed by linear stability analysis and direct numerical simulations.
Article
Optics
Liangwei Zeng, Jincheng Shi, Jiawei Li, Jingzhen Li, Qing Wang
Summary: We demonstrate that dark solitons can be stable in purely quintic nonlinear lattices, including fundamental, tripole, and five-pole solitons. These soliton families are generated on periodic nonlinear backgrounds. The form of these solitons is influenced by the propagation constant, while the number of poles does not affect the backgrounds. Dark solitons are stable only when the propagation constant is moderately large.
Article
Optics
Y. Cao, T. F. Xu
Summary: We studied gap solitons and nonlinear Bloch waves in Kerr nonlinear systems under competition between quadratic and quartic dispersions. The results show that nonlinear Bloch waves can still be regarded as infinite fundamental gap solitons chains. We also revealed the properties of the gap solitons in the relevant band gaps by numerical analysis.
Article
Crystallography
Li Shao, Yun-Long Wu, Qing Ye
Summary: The study found that in nonlinear Kerr media, the propagation characteristics of Airy beams can form anomalous bound states and tree-like structures of Airy spatial solitons.
Article
Materials Science, Multidisciplinary
Xinjian Pan, Chongfu Zhang, Chunjian Deng, Zhili Li, Qing Wang
Summary: This paper studied the propagation properties of fractional vortex beams in nonlocal nonlinear media and found that quasi-stable solitons can form when the nonlocality is strong enough and the initial power is equal to the critical power. The research indicates that the critical power of solitons with different topological charges is the same, but the orbital angular momentum increases with the increase of the fractional topological charge, and the solitons have lateral shifts in the y-direction.
RESULTS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Josselin Garnier, Kilian Baudin, Adrien Fusaro, Antonio Picozzi
Summary: By increasing the nonlinearity, a system self-organizes into an incoherent localized structure containing hidden coherent soliton states, which are fully immersed in random wave fluctuations and can hardly be identified in usual spatial or spectral domains but clearly unveiled in phase-space representation. The hidden solitons are stabilized and trapped by the incoherent localized structure, and can be observed in nonlocal nonlinear optics experiments through the measurement of the spatial spectrogram. This regime sheds new light on the quantum-to-classical correspondence with gravitational interactions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Mahmut Bagci
Summary: Partially parity-time-symmetric (pPT-symmetric) lattice solitons in quadratic nonlinear media are investigated, showing the possibility of stable evolution of solitons in this type of medium. The effects of varying lattice depth and quadratic nonlinearity strength on the model characteristics are examined comprehensively, and the stability of the solitons is tested using nonlinear evolution and linear stability spectra.
Article
Optics
Boquan Ren, Antonina A. A. Arkhipova, Yiqi Zhang, Yaroslav V. V. Kartashov, Hongguang Wang, Sergei A. A. Zhuravitskii, Nikolay N. N. Skryabin, Ivan V. V. Dyakonov, Alexander A. A. Kalinkin, Sergei P. P. Kulik, Victor O. O. Kompanets, Sergey V. V. Chekalin, Victor N. N. Zadkov
Summary: The introduction of controllable deformations into periodic materials that lead to disclinations has allowed for the construction of higher-order topological insulators hosting topological states at disclinations. In this study, nonlinear photonic disclination states were observed in waveguide arrays with pentagonal or heptagonal disclination cores inscribed in a transparent optical medium. The transition between nontopological and topological phases in these structures is controlled by the Kekule distortion coefficient, and the spatial localization of the disclination states can be controlled by their power. This observation opens up new prospects for investigating nonlinear effects in topological systems with disclinations.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Daniel Torres-Valladares, Felipe J. Villasenor-Cavazos, Servando Lopez-Aguayo
Summary: This study introduces a stochastic optimization technique that combines a variational approach with the cuckoo search algorithm to generate diverse self-trapped structures and optimize different families of self-trapped beams simultaneously. This algorithm offers a new method for obtaining self-trapped beams in nonlinear media.
Article
Multidisciplinary Sciences
Pawel S. Jung, Georgios G. Pyrialakos, Fan O. Wu, Midya Parto, Mercedeh Khajavikhan, Wieslaw Krolikowski, Demetrios N. Christodoulides
Summary: The nonlinear evolution dynamics in topological photonic lattices is systematically investigated within the framework of optical thermodynamics. This approach allows for the precise prediction of topological currents even under the extreme complexity introduced by nonlinearity.
NATURE COMMUNICATIONS
(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
Mathematics, Interdisciplinary Applications
Orazio Descalzi, Carlos Cartes
Summary: This article investigates the formation of localized spatiotemporal chaos in the complex cubic Ginzburg-Landau equation with nonlinear gradient terms and reviews the influence of multiplicative noise on stationary pulses stabilized by nonlinear gradients. Surprising results are obtained through numerical simulations and explained analytically, including the induction of velocity change in propagating dissipative solitons.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Mathematics, Interdisciplinary Applications
Krassimir Panajotov, Mustapha Tlidi, Yufeng Song, Han Zhang
Summary: In this study, we investigate a system of coupled weakly birefringent cavities filled with nonlinear Kerr material and subject to linearly polarized optical injection. Our findings demonstrate that the system supports stable three-dimensional vector localized structures known as discrete vector light bullets. We observe the generation of bright and dark discrete vector light bullets under both anomalous and normal dispersion conditions. Additionally, by increasing the coupling strength between the cavities, we observe the existence of coexisting light bullets with varying polarization degrees ranging from predominantly linear to predominantly circular. Moreover, we discover that chaotic spatio-temporal dynamics can be achieved even when the distribution of light bullets in the system is stationary under certain injection strengths.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Physics, Multidisciplinary
Fangyuan Ma, Zheng Tang, Xiaotian Shi, Ying Wu, Jinkyu Yang, Di Zhou, Yugui Yao, Feng Li
Summary: This article discusses the design and construction of elliptically geared isostatic metamaterials, which can exhibit nonlinear topological transitions through collective soliton motions. It also demonstrates the unique nonlinear topological mechanics of these materials, which have significant potential for applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Conrad B. Tabi, Hippolyte Tagwo, Camus G. Latchio Tiofack, Timoleon C. Kofane
Summary: This study theoretically investigates the modulational instability phenomenon in birefringent optical media with pure quartic dispersion and weak Kerr nonlocal nonlinearity. Nonlocality is found to expand instability regions, leading to the emergence of Akhmediev breathers through numerical simulations.
Article
Chemistry, Physical
Adina Golombek, Mukundakumar Balasubrahmaniyam, Maria Kaeek, Keren Hadar, Tal Schwartz
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Maria Kaeek, Ran Damari, Michal Roth, Sharly Fleischer, Tal Schwartz
Summary: The study demonstrates a new concept of vibrational strong coupling, showing that a monolithic photonic crystal made of a resonant material can exhibit strong coupling between optical modes and vibrational excitations. Experimental and numerical methods were used to characterize the dispersion of photonic modes for different sample thicknesses and reveal their coupling with vibrational resonances. Time-domain THz measurements successfully isolated signals from grating modes and vibro-polaritons.
Article
Optics
Gil Ilan Haham, Alexander Levin, Pavel Sidorenko, Gavriel Lerner, Oren Cohen
Summary: The proposed single-scan vectorial FROG method characterizes the amplitude, phase, and polarization of ultrashort laser pulses using a single measured spectrogram. A phase retrieval algorithm based on ptychography is used to extract full pulse information from the recorded spectrogram. This method can be applied to remove time-reversal ambiguity in second harmonic generation FROG.
JOURNAL OF PHYSICS-PHOTONICS
(2021)
Article
Multidisciplinary Sciences
Matan Even Tzur, Ofer Neufeld, Eliyahu Bordo, Avner Fleischer, Oren Cohen
Summary: This article presents the application of symmetry rules and selection rules in symmetry-broken systems. By using symmetry-breaking degrees of freedom as synthetic dimensions, the study shows that the scaling of a system's observables is constrained by selection rules as it transitions from symmetric to symmetry-broken. This phenomenon is experimentally demonstrated and the generality of this phenomenon is shown by analyzing periodically-driven systems. These symmetries and selection rules open up new routes for ultrafast spectroscopy studies.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Gavriel Lerner, Ofer Neufeld, Liran Hareli, Georgiy Shoulga, Eliayu Bordo, Avner Fleischer, Daniel Podolsky, Alon Bahabad, Oren Cohen
Summary: Symmetries and selection rules play a vital role in light-matter interactions. This study formulates a general theory that uncovers previously unidentified symmetries and selection rules in electromagnetic field systems. Through experimental demonstrations in high harmonic generation, the work showcases the potential of these findings in novel spectroscopic techniques and imprinting complex structures on extreme ultraviolet-x-ray beams.
Article
Chemistry, Physical
M. Godsi, A. Golombek, M. Balasubrahmaniyam, T. Schwartz
Summary: In this study, we experimentally demonstrate the transition between entangled and independent coupling in cavities with different longitudinal modes by gradually increasing the cavity thickness. We also observe pronounced upper polariton emission and significant changes in the transient spectra of the multimode cavities using pump-probe spectroscopy.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Gil Koren, Sagi Meir, Lennard Holschuh, Haydyn D. T. Mertens, Tamara Ehm, Nadav Yahalom, Adina Golombek, Tal Schwartz, Dmitri I. Svergun, Omar A. Saleh, Joachim Dzubiella, Roy Beck
Summary: Short-range interactions and long-range contacts drive the folding of proteins. The structure of proteins directly affects their biological function. Nearly 40% of eukaryotes proteome is composed of intrinsically disordered proteins (IDPs) and protein regions that fluctuate between ensembles of numerous conformations. Polymer physics can, to some level, relate the IDP's sequence to its ensemble conformations, but long-range contacts between distant amino acids play a crucial role in determining intramolecular structures.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Maria Kaeek, Ran Damari, Sharly Fleischer, Tal Schwartz
Summary: In this study, we demonstrate and experimentally study strong coupling in a monolithic, 1D terahertz photonic crystal, where the guided modes are strongly coupled with the vibrational excitation of the organic material comprising the photonic structure.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
M. Balasubrahmaniyam, Arie Simkhovich, Adina Golombek, Tal Schwartz
Summary: Using time-resolved microscopy, the study investigates the long-range transport dynamics of collective excitations in an organic Bloch surface-wave polariton system, revealing sub-ballistic transport with transient population oscillations having a finite coherence length.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Materials Science, Multidisciplinary
M. Balasubrahmaniyam, Cyriaque Genet, Tal Schwartz
Summary: We reveal a transition within the strong coupling regime and below the crossover to ultrastrong coupling, which alters the coupling mechanism in multimode cavities. This transition drastically modifies the Hamiltonian describing the polaritons, such that different cavity modes are either entangled via the material or completely decoupled.
Proceedings Paper
Engineering, Electrical & Electronic
Adina Golombek, Mukundakumar Balasubrahmaniyam, Maria Kaeek, Keren Hadar, Tal Schwartz
2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2020)
Article
Physics, Multidisciplinary
Ofer Neufeld, Oren Cohen
PHYSICAL REVIEW RESEARCH
(2020)
Article
Optics
Ofer Neufeld, Matan Even Tzur, Oren Cohen
Proceedings Paper
Engineering, Electrical & Electronic
Ran Damari, Omri Weinberg, Natalia Demina, Katherine Akulov, Daniel Krotkov, Sharly Fleischer, Tal Schwartz
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
Article
Optics
Ofer Neufeld, Oren Cohen
Summary: Synthetic chiral light fields, introduced recently as a novel source of chirality, exhibit complex three-dimensional polarization structures and generate strong nonlinear chiral signals upon interactions. However, the sign of their chirality has not been defined, prompting researchers to propose an unambiguous definition and calculation method for their handedness.