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Superluminal light attenuated by strong dispersion of complex refractive index

Chinese Physics B 2016年第2期25卷 477-481页

作者： Abdurahman Ahmed Yonis Vadim Nickolaevich Mal'nev Belayneh Mesfin Ali Department of Physics Addis Ababa University

The propagation of narrow packets of electromagnetic waves（EMWs） in frequency dispersive medium with the consideration of the complex refractive index is studied. It is shown that counting in the dispersion of the complex refractive index within the context of the conventional expression of the group velocity of narrow wave packets of EMWs propagating in a dispersive medium results in the appearance of additional constraints on the group velocity, which dictates that the physically acceptable group velocity can only be realized in the case of a negligible imaginary part of the group index. In this paper, the conditions that allow one to realize the physically acceptable group velocity are formulated and analyzed numerically for the relevant model of the refractive index of a system of two-level atoms in the optical frequency range. It is shown that in the frequency band where superluminal light propagation is expected, there is a strong dispersion of the refractive index that is accompanied with strong absorption, resulting in a strongly attenuated superluminal light.

关键词： group velocity group index superluminal light slow waves

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Large group-index bandwidth product empty core slow light photonic crystal waveguides for hybrid silicon photonics

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Frontiers of Optoelectronics 2014年第3期7卷 376-384页

作者： Charles CAER Xavier LE ROUX Samuel SERNA Weiwei ZHANG Laurent VIVIEN Eric CASSAN Institut d'Electronique Fondamentale University Paris-Sud CNRS UMR 8622 Bat. 220 91405 Orsay Cedex France

This paper investigates the slow light propaga- tion in silicon on insulator wide slot photonic crystal waveguides （PCWs）. Two design schemes are presented, relying on the dispersion engineering of hole lattice and slot, respectively. Mode patterns and band diagrams are calculated by 3D-plane wave expansion method. Then, coupling and slow light propagations are modeled using finite difference time domain method in a full Mach- Zehnder interferometer （MZI）. Results show high amplitudes interference fringes and high coupling efficiencies. Fabrication and measurement of devices lead to slow light propagation with group indices above 50, while multiple scattering and localized modes near the band edge also observed. This study provides insights for losses in hollow core slot high group index waveguides.

关键词： silicon photonics photonic crystals (PC) slot waveguides slow waves

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