scholarly journals Negative Group Velocity in the Absence of Absorption Resonance

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Dexin Ye ◽  
Guoan Zheng ◽  
Jingyu Wang ◽  
Zhiyu Wang ◽  
Shan Qiao ◽  
...  
Keyword(s):  
Group Velocity ◽  
Negative Group ◽  
Absorption Resonance ◽  
Negative Group Velocity

Negative Group Velocity of Surface Polaritons in Metal Foil Nanostructure

2017 ◽  
Vol 9 (3) ◽  
pp. 03039-1-03039-4 ◽  
Author(s):  
Y. M. Aleksandrov ◽  
◽  
V. V. Yatsishen ◽  
Keyword(s):  
Group Velocity ◽  
Metal Foil ◽  
Negative Group ◽  
Surface Polaritons ◽  
Negative Group Velocity

X-wave bullets with negative group velocity in vacuum

2006 ◽  
Vol 31 (23) ◽  
pp. 3532 ◽  
Author(s):  
Carlos J. Zapata-Rodríguez ◽  
Miguel A. Porras
Keyword(s):  
Group Velocity ◽  
Negative Group ◽  
Negative Group Velocity

Split-ring resonator-loaded X-band waveguide supporting negative group velocity

2018 ◽  
pp. 291-308
Author(s):  
Joaquim J. Barroso ◽  
Joaquim P. Leite ◽  
Pedro J. Castro ◽  
Ugur C. Hasar ◽  
Jose Edimar B. Oliveira
Keyword(s):  
Group Velocity ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Negative Group ◽  
Split Ring ◽  
X Band ◽  
Negative Group Velocity

scholarly journals Study of Abnormal Group Velocities in Flexural Metamaterials

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hong Woo Park ◽  
Joo Hwan Oh
Keyword(s):  
Group Velocity ◽  
Periodic Structure ◽  
Three Dimensional ◽  
Wave Dispersion ◽  
Abnormal Behavior ◽  
Flexural Wave ◽  
Negative Group ◽  
One Dimensional ◽  
Optical Branch ◽  
Negative Group Velocity

Abstract Generally, it has been known that the optical branch of a simple one-dimensional periodic structure has a negative group velocity at the first Brillouin zone due to the band-folding effect. However, the optical branch of the flexural wave in one-dimensional periodic structure doesn’t always have negative group velocity. The problem is that the condition whether the group velocity of the flexural optical branch is negative, positive or positive-negative has not been studied yet. In consequence, who try to achieve negative group velocity has suffered from trial-error process without an analytic guideline. In this paper, the analytic investigation for this abnormal behavior is carried out. In particular, we discovered that the group velocity of the optical branch in flexural metamaterials is determined by a simple condition expressed in terms of a stiffness ratio and inertia ratio of the metamaterial. To derive the analytic condition, an extended mass-spring system is used to calculate the wave dispersion relationship in flexural metamaterials. For the validation, various numerical simulations are carried out, including a dispersion curve calculation and three-dimensional wave simulation. The results studied in this paper are expected to provide new guidelines in designing flexural metamaterials to have desired wave dispersion curves.

On electromagnetic waves with a negative group velocity

2010 ◽  
Vol 36 (13) ◽  
pp. 1129-1139
Author(s):  
V. P. Makarov ◽  
A. A. Rukhadze ◽  
A. A. Samokhin
Keyword(s):  
Group Velocity ◽  
Electromagnetic Waves ◽  
Negative Group ◽  
Negative Group Velocity

Negative group velocity of a light pulse in cesium vapour

2002 ◽  
Vol 32 (7) ◽  
pp. 567-569 ◽  
Author(s):  
A M Akulshin ◽  
A Cimmino ◽  
G I Opat
Keyword(s):  
Group Velocity ◽  
Light Pulse ◽  
Negative Group ◽  
Negative Group Velocity
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