Eur. Phys. J. D 60, 369-372 (2010)
https://doi.org/10.1140/epjd/e2010-00207-4

Comparison of photonic crystal narrow filters with metamaterials and dielectric defects

¹ Faculty of Bonab Engineering and Technology, Bonab, Iran
² Rice University, 6100 Main street, Houston, TX, 77005, USA
³ Department of Physics, Azarbaijan University of Tarbiat Moallem, Tabriz, Iran
⁴ Department of Physics Engineering (Optics-Laser), YRC of Islamic Azad University, Bonab Branch, Iran
⁵ Applied physics Department, Smithsonian Institute, PO Box 37012, Washington, DC, 20013-7012, USA

Corresponding author: ^a h.masalehdan@gmail.com

Received: 6 March 2010
Revised: 17 June 2010
Published online: 2 August 2010

Abstract

The photonic band-gap of the two kinds of 1D photonic crystal structure which is composed of the form of (AB)^N1C^m(BA)^N2, one with a metamaterial defect layer (MDL) and the other one with a dielectric defect layer (DDL) are studied. Our results show that in both cases, where there is only one defect layer, m=1, no defect mode exists, but for two defect layers (m=2) there is a single defect mode which is centered in the middle of the band-gap. The width of the defect mode in DDL is narrower than that in MDL. For a number of defects of more than two (m>2) and even, in both of the MDL and DDL structures, there is only one defect mode. For m>2 and odd, the defect mode in the MDL vanishes, but for DDL there is two defect-mode symmetrically centered in the middle of the band-gap. The effects of the defect layers refractive index value, the periodicity number of the structures and the incident angle on the properties of the defect modes and the transmittance spectrum are discussed.