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Group velocity, negative and ultra-high index of refraction in photonic band gap materials

✍ Scribed by S. P. Ojha; Sanjeev K. Srivastava

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
138 KB
Volume
42
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

This paper shows that inside photonic band gap (PBG) materials the effective index of refraction n~eff~, defined in terms of group velocity, becomes negative in a certain range of frequencies. Also, near the photonic‐band edge the effective index of refraction n~eff~ attains exceptionally high values, which are greater than the refractive indices of the materials (n~1~ and n~2~) used. This is related to the anomalous behaviour of group velocity, which becomes negative in a certain range and approaches zero near the photonic‐band edge. PBG material with a modified index of refraction has applications in the system of lasing without inversion and can also be used in construction of a perfect lens and other optical devices. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 82–87, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20216

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