1998/11/30 by A. Pablo, Andrés Barbero, Hugo E. Hernández‐Figueroa +3
Engineering · Physics and Astronomy · #Causality (physics) #Classical mechanics #Einstein #Evanescent wave #Group (periodic table) #Group velocity #Mechanical and Optical Resonators #Optics #Photonic and Optical Devices #Physics #Quantum electrodynamics #Quantum mechanics #Quantum optics and atomic interactions #Speed of light (cellular automaton) #Superluminal motion #Theoretical physics #physics.gen-ph
paper · pdf · doi:10.1103/physreve.62.8628
published as Physical Review E62 (2000) 8628-8635 · plain LaTeX file (14 pages), plus 15 figures in .jpg
arxiv created 1998/12/08 · openalex publication_date 2000/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The group velocity of evanescent waves (in undersized waveguides, for instance) was theoretically predicted, and has been experimentally verified, to be superluminal (v(g)>c). By contrast, it is known that the precursor speed in vacuum cannot be larger than c. In this paper, by computer simulations based on Maxwell equations only, we show the existence of both phenomena. In other words, we verify the actual possibility of superluminal group velocities, without violating the so-called (naive) Einstein causality.