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Group velocity, negative and ultra‐high index of refraction in photonic band gap materials
Author(s) -
Ojha S. P.,
Srivastava Sanjeev K.
Publication year - 2004
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20216
Subject(s) - negative refraction , refractive index , photonic crystal , photonics , optics , group velocity , microwave , photonic metamaterial , slow light , physics , lasing threshold , range (aeronautics) , refraction , optoelectronics , materials science , laser , quantum mechanics , composite material
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