Design and Dispersion Control of Microstructured Multicore Tellurite Glass Fibers with In-Phase and Out-of-Phase Supermodes by Elena A. Anashkina, Alexey V. Andrianov

“…For nonlinear optical fibers, group velocity dispersion that can be controlled by microstructuring is also of great importance. …”
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Guidance of surface elastic waves along a linear chain of pillars by Mohammed Al Lethawe, Mahmoud Addouche, Sarah Benchabane, Vincent Laude, Abdelkrim Khelif

“…A variety of guided modes, some of them exhibiting a very low group velocity, are shown to exist at frequencies close to the resonance frequencies of the pillars. …”
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Slow Surface Eigenmodes Directed by the Mu-Negative Metamaterial Slab by Viktor Galaydych, Oleksandr Sporov, Volodymyr Olefir, Mykola Azarenkov

“…The second mode may have zero group velocity at a certain frequency. Characteristics of these surface modes for different values of the mu-negative slab parameters have been studied. …”
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Asymptotic analysis of numerical wave propagation in finite difference equations by Giles, M. (Michael), Thompkins, William T.

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Applications Of Perturbation Theory To Acoustic Logging by Ellefsen, K. J., Cheng, C. H.

“…For guided wave propagation in boreholes, perturbation theory is used to calculate (1) the partial derivative of the wavenumber or frequency with respect to an elastic modulus or density, (2) group velocity, and (3) the effect of a borehole with a slightly irregular cross section upon the phase velocity. …”
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High‐Q metallic Fano metamaterial for highly efficient Cerenkov lasing by Kim, Seontae, Baek, In-Keun, Bhattacharya, Ranajoy, Hong, Dongpyo, Sattorov, Matlabjon, Bera, Anirban, So, Jin-Kyu, Kim, Dai-Sik, Park, Gun-Sik

“…The interplay between an extremely low group velocity from the infinite transverse permittivity of the anisotropic metamaterial and the subradiant damping from a Fano‐type slit mode is shown to be responsible for the high‐Q value, which is measured to be unprecedented at 700. …”
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Anisotropic elastic characterization of surfaces from 2 MHz to 20 GHz by Briggs, G, Kolosov, O

“…At the bottom of the frequency range, group velocity measurements can be made by timing the transit of pulses between knife edges. …”

Characterization of ultrashort laser pulses employing self-phase modulation dispersion-scan technique by Sharba, AB, Chekhlov, O, Wyatt, AS, Pattathil, R, Borghesi, M, Sarri, G

“…Mainly, the use of SPM cancels out the phase and group velocity mismatch errors and dramatically widens the spectral acceptance of the nonlinear medium and the range of working wavelength. …”

Mode-locked L-band bismuth–erbium fiber laser using carbon nanotubes by Ahmad, Harith, Zulkifli, Ahmad Zarif, Muhammad, F.D., Zulkifli, M.Z., Thambiratnam, K., Harun, Sulaiman Wadi

“…The cavity is 11.6 m long with an overall group velocity dispersion of +0.063 ps2. The output pulses have a repetition rate, average output power, pulse energy and peak power of 11.18 MHz, 5 mW, 448 pJ and 1 kW, respectively. …”

Photonic and or gate by using fiber coupler by M. Roslan, Sufi, Aziz, M. Safwan, Saktioto, Saktioto, Ali, Jalil

“…In this study, a numerical modeling of secant hyperbolic soliton pulse based on Nonlinear Schrodinger Equation (NLSE) was performed in balance of Self-Phase modulation and Group velocity dispersion by normalized distance, time and field calculated by 1032 iteration step. …”
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Marche au hasard d’une quasi-particule massive dans le gaz de phonons d’un superfluide à très basse température by Castin, Yvan

“…We generalize this calculation to the case of a $\gamma $ quasiparticle of arbitrary subsonic group velocity, with a rigorous construction of the $S$ matrix between exact asymptotic states, taking into account the unceasing phonon–phonon and phonon–$\gamma $ interaction, which dresses the incoming and emerging phonon and $\gamma $ quasiparticle by virtual phonons; this sheds new light on the Feynman diagrams of phonon–$\gamma $ scattering. …”
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Special theory of relativity for a graded index fibre by Shinichi Saito

“…Contrary to the unusual behaviours of the phase velocity, the group velocity is always below c. This thought experiment might be useful for considering insight into the polarisation state of light.…”
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Green's functions of and emission into discrete anisotropic and hyperbolic baths by Lewis Ruks, Thomas Busch

“…Our approximation then converges exponentially with increasing source-receiver separation ρ when resonant wave packets with group velocity parallel to ρ exist. In hyperbolic media this condition may not be satisfied, and we find that the exponential decay length of oscillating evanescent waves locally around caustics generally depends as a power law with exponent 3/2 on the angle made between ρ and the caustic. …”
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Emergence of Solitons from Irregular Waves in Deep Water by Weida Xia, Yuxiang Ma, Guohai Dong, Jie Zhang, Xiaozhou Ma

“…The solitons propagated approximately at a speed of the linear group velocity. All the solitons had a relatively large amplitude and one detected soliton’s height was two times larger than the significant wave height of the wave train, therefore satisfying the rogue wave definition. …”
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On-Chip Multichannel Dispersion Compensation and Wavelength Division MUX/DeMUX Using Chirped-Multimode-Grating-Assisted Counter-Directional Coupler by Zhixiao Lv, Jiangbing Du, Zuyuan He

“…The device is highly compact and highly scalable, which makes it rather convenient for increasing the group velocity dispersion (GVD) and channel number, indicating flexible applications for versatile systems, including typically coarse wavelength division multiplexer four-lane (CWDM4) transceivers.…”
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Strain Effect on Thermoelectric Performance of InSe Monolayer by Qian Wang, Lihong Han, Liyuan Wu, Tao Zhang, Shanjun Li, Pengfei Lu

“…Tensile strain can enhance anharmonic phonon scattering, giving rise to the enhanced phonon scattering rate, reduced phonon group velocity and heat capacity, and therefore lattice thermal conductivity decreases from 25.9 to 13.1 W/mK when the strain of 6% is applied. …”
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Thermal Transport Study in a Strained Carbon Nanotube and Graphene Junction Using Phonon Wavepacket Analysis by Jungkyu Park

“…The study also showed that the transmission of phonon energy through the SWCNT–graphene junction has a slight dependence on the group velocity of phonons, with phonons having higher group velocities transmitting the junction more effectively. …”
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FM Mode-Locking Fiber Laser by Inmar N. Ghazi, Waleed Y. Hussein, Salam Sami M. Salih

“…Also, modulation frequency effecton pulse parameters is investigated by driving the modulator into different frequenciesvalues.This study shows the stability of working in anomalous dispersion regime and thepulse compression effect is better than counterpart normal regime, due to thecombination effectof both negative(Group velocity dispersion), GVD and nonlinearity. Also it shows thegreat effect of modulation frequency on pulse parameters and stability of the system.Model-locking fiber laser master equation is introduced, and using the assumed pulseshapes for both dispersion regimes after modifying (Ginzburg-Landau equation), GLEand by applying the moment method, a set of five ordinary differential equations areintroduced describing pulse parameters evolution during each roundtrip.To solve theseequations numerically using fourth- fifth order, Runge-Kutta method is performedthrough MatLab 7.0 program.…”
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Formation Tracking With Size Scaling of Double Integrator Agents by Djati Wibowo Djamari, Asif Awaludin, Halimurrahman Halimurrahman, Rommy Hartono, Patria Rachman Hakim, Adi Wirawan, Haikal Satrya Utama, Tiara Kusuma Dewi

“…It is shown that under a switching-directed graph, the group of agents achieves the desired formation pattern with the desired scaling factor as well as the desired group's velocity if the union of the sensing and communication graphs contains a directed spanning tree. …”
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Identification of Vibration Modes and Wave Propagation of Operational Rails by Multipoint Hammering and Reciprocity Theorem by Kodai Matsuoka, Kazuhiro Kajihara, Hirofumi Tanaka

“…As a result, the wavelength (wavenumber)-, group velocity-, and distance damping (attenuation) frequency relationship of the wave propagation is clarified in addition to the rail frequencies and mode shapes up to approximately 1500 Hz, including the pinned-pinned mode. …”
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