Article
Multidisciplinary Sciences
George H. Choueiri, Jose M. Lopez, Atul Varshney, Sarath Sankar, Bjoern Hof
Summary: Turbulence generally occurs in shear flows when velocities and inertial forces are large, but viscoelastic fluids can exhibit disordered motion even with low inertia. Elastoinertial turbulence (EIT) is observed in a narrow Reynolds number interval, showing weakly chaotic dynamics in experiments and instability at lower Reynolds numbers than predicted by theory. EIT structures can be detected in a wide range of parameters, dominating viscoelastic flows across a significant range of Reynolds numbers.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Andrey Bakulin, Dmitry Neklyudov, Ilya Silvestrov
Summary: This study reveals that land seismic data in complex areas exhibit weak and distorted prestack reflections with low coherency. The researchers explain this phenomenon by introducing multiplicative random noise, represented by random timeshifts and random phase perturbations. They speculate that these multiplicative distortions can be attributed to near-surface scattering layers with small-to-medium-scale geologic heterogeneities. The findings of this study also provide theoretical justification for previously proposed methods of addressing random multiplicative noise in seismic processing.
Article
Optics
Weiru Fan, Tianrun Chen, Xingqi Xu, Ziyang Chen, Huizhu Hu, Delong Zhang, Da-Wei Wang, Jixiong Pu, Shi-Yao Zhu
Summary: Optical phase is crucial for biomedical imaging and astronomical observation, but it is often obscured by scattering media. Current methods are limited in retrieving phases at different depths. To address this challenge, a speckle three-dimensional reconstruction network (STRN) is developed to simultaneously extract multiple phase objects at different depths with high fidelity from speckle patterns.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Xiaoxiao Xue, Philippe Grelu, Bofan Yang, Mian Wang, Shangyuan Li, Xiaoping Zheng, Bingkun Zhou
Summary: This article investigates a novel class of solitons that are generated in spectrally confined optical cavities with practically no dispersion, leading to the generation of stable dispersion-less dissipative solitons. The interplay between the Kerr nonlinearity and spectral filtering results in Nyquist-pulse-like solitons with ultra-flat spectra, and the transition from soliton molecules to single solitons is also observed.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Georgios M. Nikolopoulos
Summary: In this study, we investigate whether the presence of Kerr nonlinearity in multiple-scattering optical media offers any advantage in the design of physical unclonable functions. Our findings suggest that nonlinear physical unclonable functions can be more robust against cloning compared to their linear counterparts that have been used in various cryptographic applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
J. P. Abbo, A. Alim, C. G. L. Tiofack, A. Mohamadou
Summary: The spatiotemporal modulation instability (MI) in a fiber Bragg grating with cubic-quintic nonlinearities and parity-time symmetry is investigated. The dispersion relation equation of the spatiotemporal MI is derived using a linear stability analysis. The impact of quintic nonlinearity and gain/loss coefficient on the occurrence of the spatiotemporal MI is studied in both normal and anomalous dispersion regimes.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Physical
Lucas Huber, Sebastian F. Maehrlein, Feifan Wang, Yufeng Liu, X. -Y. Zhu
Summary: The ultrafast optical Kerr effect is commonly used to investigate structural dynamics and interactions of materials, with non-degenerate mixing schemes allowing for more accurate detection. Two-color experiments can reveal sources of temporal dynamics in the OKE signal, showing how birefringence in crystalline solids can entirely change the character of the signal.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Multidisciplinary Sciences
Christoph Zunke, Joerg Bewerunge, Florian Platten, Stefan U. Egelhaaf, Aljaz Godec
Summary: The research investigates particle dynamics in complex environments using colloidal particles moving in a laser speckle pattern as a model system. The study reveals that the particles explore the speckle in a fractal manner, which can be traced back to the underlying medium with an adjustable fractal dimension.
Article
Multidisciplinary Sciences
Miles H. Anderson, Wenle Weng, Grigory Lihachev, Alexey Tikan, Junqiu Liu, Tobias J. Kippenberg
Summary: Researchers have discovered a new type of dissipative structure called "zero-dispersion solitons" which combine switching waves and dissipative solitons. These structures can exist in the regime where group velocity dispersion approaches zero and have stable solitary structures. They have the potential for generating wideband frequency comb spectra.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Kwangrae Kim, Hoon Kim, Jonghwan Kim, Changil Kwon, Jun Sung Kim, B. J. Kim
Summary: A potential divergence in the static excitonic susceptibility of the candidate material Ta2NiSe5 was observed using Raman spectroscopy, revealing evidence for electronically-driven phase transition.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Vincent Ng, Farhan Azeem, Luke S. Trainor, Harald G. L. Schwefel, Stephane Coen, Miro Erkintalo, Stuart G. Murdoch
Summary: Parametric oscillation in Kerr microresonators offers a promising method to generate new optical frequencies in a compact and low-power device. However, the generation of large frequency shift sidebands usually requires precise phasematching, which is limited by the resonator's dispersion profile. In this paper, we propose a multimode four-wave-mixing process that relaxes the phasematching requirements, allowing the formation of large frequency shift sidebands even in resonators with strong second-order dispersion. Experimental results using a magnesium-fluoride micro-disk resonator demonstrate the generation of four distinct multimode parametric processes with frequency shifts ranging from 118 to 216 THz, achieving a separation of almost three octaves between the two sidebands.
Article
Physics, Multidisciplinary
A. Eloy, O. Boughdad, M. Albert, P-E Larre, F. Mortessagne, M. Bellec, C. Michel
Summary: This experimental study investigates the nonlinear coherent structures of superfluid light passing an obstacle in an all-optical configuration, revealing different hydrodynamic regimes organized in a unique phase diagram. The focus is on vortices formed in the wake of the obstacle, with analysis of their intensity profile and core radius dependence on healing length. The results pave the way for further research on turbulence in photonic superfluids and offer versatile experimental tools for simulating quantum transport with nonlinear light.
Article
Physics, Particles & Fields
Jun-Huai Xu, Zi-Han Zheng, Ming-Jian Luo, Jia-Hui Huang
Summary: The research investigates the superradiant stability of a Kerr-Newman black hole and charged massive scalar perturbation, finding that under certain conditions, the system is superradiantly stable.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Mechanics
Jun Fan, Jinhai Zheng, Aifeng Tao, Yuming Liu
Summary: The researchers theoretically and experimentally investigated the mechanism of upstream wave generation induced by ripples on a horizontal bottom, deriving general conditions and equations governing the amplitude evolution of these waves. Laboratory experiments confirmed the theory's predictions regarding the kinematics and critical flow conditions for observing the phenomenon.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Physics, Multidisciplinary
Tristan Wen Jie Choo, Ruochong Zhang, Renzhe Bi, Malini Olivo
Summary: The recently developed Diffuse Speckle Pulsatile Flowmetry (DSPF) technique offers high measurement rates for non-invasive blood flow measurement in deep tissue, showing potential for monitoring pathologies associated with abnormal blood flow. This study investigates the effects of parameters such as speckle size and exposure time on the measured flow readings and sensitivity of the DSPF technique, providing guidance for optimizing settings.
FRONTIERS IN PHYSICS
(2022)
Article
Mathematics, Applied
M. J. Morel, U. Bortolozzo, M. G. Clerc, A. Jullien, S. Residori
Article
Chemistry, Multidisciplinary
Kun Tang, Chenni Xu, Sebastien Guenneau, Patrick Sebbah
Summary: Coordinate-transformation-inspired optical devices, such as wave shifters and rotators, have been proposed for flexural waves based on the coordinate transformation method. Experimental results show that the wave shifter can deviate a short pulse without reflection or temporal distortion. Additionally, a wave rotator designed in cylindrical coordinates is demonstrated to twist a pulsed plane wave while maintaining wavefront integrity and pulse shape, without introducing extra time delay.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Optics
Umberto Bortolozzo, Stefania Residori, Jean-Pierre Huignard
Summary: Liquid crystal light valves (LCLV) are spatial light modulators that can control phase and amplitude properties of optical beams with sub-millisecond speed when operated in transient dynamic mode. The large birefringence of liquid crystals allows for sufficient phase shifts to meet the needs of various optical measurement and imaging methods, while providing kilohertz speed. These response times also suggest potential applications in biophotonics and environmental monitoring.
Article
Optics
Bhupesh Kumar, Ran Homri, Priyanka, Santosh K. Maurya, Melanie Lebental, Patrick Sebbah
Summary: In sufficiently strong scattering media, light transport is suppressed and modes are exponentially localized.We demonstrate that all lasing modes are spatially localized by undoing gain competition and cross-saturation, and selectively exciting the modes.By efficiently suppressing the spatial hole burning effect, we can turn on the optimally outcoupled random lasing modes.
Article
Optics
N. Bachelard, A. Schumer, B. Kumar, C. Garay, J. Arlandis, R. Touzani, P. Sebbah
Summary: A non-perturbative theory is proposed to predict the position of exceptional points in disordered scattering media, particularly in disordered photonic systems. The accuracy of the method depends on the number of localized states considered.
Article
Multidisciplinary Sciences
Chenni Xu, Itzhack Dana, Li-Gang Wang, Patrick Sebbah
Summary: This study investigates the nonlinear dynamics of light propagation on a two-dimensional curved surface in a three-dimensional space by considering its equivalent flat billiard with nonuniform distribution of refractive index. The researchers find that the degree of chaos is fully controlled by a single curvature-related geometric parameter of the curved surface, and this analogy between two unrelated systems not only provides a way to control chaos but also has potential applications in various fields.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
John C. Howell, Merav Kahn, Einav Grynszpan, Ziv Roi Cohen, Stefania Residori, Umberto Bortolozzo
Summary: This article discusses the fundamental roles of frequency and phase in parameter estimation, specifically in the Sagnac effect. A novel, ultrasensitive gyroscope based on the steep frequency-dependent gain of a liquid crystal light valve is described. Compelling experimental evidence is provided to illustrate the fundamental importance of the Doppler shift in the Sagnac effect, resolving a long-debated question. Experimental results show orders of magnitude improvement in sensitivity compared to the standard quantum limit of a phase estimation-based gyroscope.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
Kun Tang, Eitam Luz, David Amram, Luna Kadysz, Sebastien Guenneau, Patrick Sebbah
Summary: In this study, the practical realization of a unidirectional invisibility cloak for flexural waves using an area-preserving coordinate transformation is proposed. Time-resolved experiments and three-dimensional full-elasticity simulations demonstrate the effectiveness of the cloak in deviating pulsed plane waves and recombining the initial wavefront.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Chenni Xu, Li-Gang Wang, Patrick Sebbah
Summary: An approach to undo chaotic behavior and control ray trajectories in optical billiards is presented. By introducing spatially varying refractive index using conformal mapping, the chaotic billiard system becomes fully predictable and integrable. Additionally, the connection between chaotic billiards and non-Euclidean geometries allows for the manipulation of trajectories. This method opens up potential applications in the field of optical microcavities.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Renu Yadav, Patrick Sebbah, Maruthi M. Brundavanam, B. N. Shivakiran Bhaktha
Summary: Random lasers are highly susceptible to changes in the scattering medium due to disorder-induced feedback. By utilizing the sensitivity of lasing modes to perturbations in disordered systems, it is possible to map the regions of perturbation. A tracking parameter has been defined to locate the displacement region of a scatterer by a few nanometers, and numerical results show that the precision of the method increases with the number of modes. This proposed method opens up the potential application of random lasers in monitoring nanoscale displacement for single-particle detection and monitoring.
Proceedings Paper
Engineering, Electrical & Electronic
Bhupesh Kumar, Priyanka, Santosh Maurya, Patrick Sebbah
Summary: The research demonstrates random lasing action on a two-dimensional active surface with randomly distributed air holes, which leads to coherent multiple scattering and radiation coupling out vertically to the surface.
2021 FIFTEENTH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Stefania Residori, Umberto Bortolozzo, Jean-Pierre Huignard
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Materials Science, Multidisciplinary
K. Tang, M. Makwana, R. Craster, P. Sebbah
Article
Physics, Fluids & Plasmas
Valeska Zambra, Marcel G. Clerc, Raouf Barboza, Umberto Bortolozzo, Stefania Residori
Proceedings Paper
Engineering, Electrical & Electronic
V. M. di Pietro, A. Jullien, U. Bortolozzo, N. Forget, S. Residori
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
