Remarks on “group velocity, negative and ultra-high index of refraction in photonic band gap materials”

✍ Scribed by Alvaro Gómez; Angel Vegas; Miguel A. Solano

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 53 KB
• Volume: 44
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.20617

✦ Synopsis

Abstract

In the paper of Ojha et al. (Microwave Opt Technol Lett 42 (2004), 82–87), an erroneous definition of the effective refractive index n~eff~ in a photonic band gap (PBG) structure is used. The effective refractive index n~eff~ is defined as a function of the group velocity; this suffers from two main errors: firstly, the concept of group velocity is not useful in regions of anomalous dispersion, and this is just the region of interest for the calculus in Ojha et al. (Microwave Opt Technol Lett 42 (2004), 82–87) of n~eff~ of the PBG structure, and secondly, in any case the refractive index has to be defined in terms of the phase velocity. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 302–303, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20617