Eur. Phys. J. B 52, 37-40 (2006)
https://doi.org/10.1140/epjb/e2006-00275-9

Omnidirectional zero- gap in symmetrical Fibonacci sequences composed of positive and negative refractive index materials

¹ College of Precision Instrument and Optoelectronics Engineering, Institute of Laser and Optoelectronics, Tianjin University, Tianjin, 300072, P.R. China
² Henan Key Laboratory of Laser and Opto-electric Information Technology, Zhengzhou University, Zhengzhou, 450052, P.R. China

Corresponding author: ^a zhanghuiyun1019@yahoo.com.cn

Received: 18 April 2006
Revised: 2 June 2006
Published online: 6 July 2006

Abstract

The band structures of symmetrical Fibonacci sequences (SFS) composed of positive and negative refractive index materials are studied with a transfer matrix method. A new type of omnidirectional zero- gaps is found in the SFS. In contrast to the Bragg gaps, such an omnidirectional zero- gap is insensitive to the incident angles and polarization, and is invariant upon the change of the ratio of the thicknesses of two media. It is found that omnidirectional zero- gap exists in all the SFS, and it is rather stable and independence of the structure sequence.