Consideration of dispersion and group velocity dispersion in the determination of velocities of electromagnetic propagation [PDF]
SPIE Proceedings, 2010 Electromagnetic (EM) propagation velocities play an important role in the determination of power and energy flow in materials and interfaces. It is well known that group and phase velocities need to be in opposition in order to achieve negative refractive index.
Chatterjee, Monish Ranjan +1 more
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Extracting Group Velocity Dispersion values using quantum-mimic Optical Coherence Tomography and Machine Learning. [PDF]
Sci Rep, 2023 Quantum-mimic Optical Coherence Tomography (Qm-OCT) images are cluttered with artefacts - parasitic peaks which emerge as a by-product of the algorithm used in this method.
Maliszewski KA +4 more
europepmc +2 more sources
Dispersion, group velocity, and multisymplectic discretizations
Mathematics and Computers in Simulation, 2009 The authors consider the dispersive properties of multisymplectic discretization of linear wave and the sine Gordon equations. In particular a leapfrog in space and time scheme and the Preissman box scheme is considered. They find the numerical dispersions are monotonic and that the sign of the group velocity is preserved but for the nonsymplectic ...
Schober, C. M., Wlodarczyk, T. H.
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Group-velocity-dispersion engineering of tantala integrated photonics
Optics Letters, 2021 Designing integrated photonics, especially to leverage Kerr-nonlinear optics, requires accurate and precise knowledge of the refractive index across the visible to infrared spectral ranges. Tantala ( T
Jennifer A. Black +5 more
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Realizing normal group-velocity dispersion in free space via angular dispersion [PDF]
Optics Letters, 2021 It has long been thought that normal group-velocity dispersion (GVD) cannot be produced in free space via angular dispersion. Indeed, conventional diffractive or dispersive components such as gratings or prisms produce only anomalous GVD. We identify the conditions that must be fulfilled by the angular dispersion introduced into a plane-wave pulse to ...
Layton A. Hall, Ayman F. Abouraddy
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Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications. [PDF]
Nat Commun, 2020 Nonlinear effects have been studied in optical fiber communications channels under various specified parameter regimes. Here, the authors develop an approximate model via perturbation that is more accurate for the highly nonlinear regime.
Oliari V, Agrell E, Alvarado A.
europepmc +2 more sources
GROUP VELOCITY DISPERSION CONTROL BY SUSPENDED- CORE SOFT-GLASS FIBER FILLED WITH CARBON DISULFIDE [PDF]
Tạp chí Khoa học Đại học Đà LạtAn enhanced group velocity dispersion (GVD) control with suspended core fiber (SCF) has been investigated using numerical simulation based on the finite element method.
Tran Bao Tran Le +3 more
doaj +2 more sources
Group velocity, phase velocity, and dispersion in human calcaneusin vivo
The Journal of the Acoustical Society of America, 2007 Commercial bone sonometers measure broadband ultrasonic attenuation and/or speed of sound (SOS) in order to assess bone status. Phase velocity, which is usually measured in frequency domain, is a fundamental material property of bone that is related to SOS, which is usually measured in time domain.
Keith A. Wear, Wear, Keith A.
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New classifications of nonlinear Schrödinger model with group velocity dispersion via new extended method [PDF]
Results in Physics, 2021 This work investigates the nonlinear Schrödinger equation (NLSE) with group velocity dispersion and second order spatiotemporal dispersion coefficients. The governing model is reduced into the classical nonlinear ordinary differential equation.
Haci Mehmet Baskonus +6 more
doaj +2 more sources
Quasi-linear analysis of dispersion relation preservation for nonlinear schemes
Advances in Aerodynamics, 2022 In numerical simulations of complex flows with discontinuities, it is necessary to use nonlinear schemes. The spectrum of the scheme used has a significant impact on the resolution and stability of the computation.
Fengyuan Xu +3 more
doaj +1 more source