Engineering modes in optical fibers with metamaterial

doi:10.1007/s12200-009-0024-x

Front Optoelec Chin

2009, Vol. 2

Issue (2) : 153-158 https://doi.org/10.1007/s12200-009-0024-x

RESEARCH ARTICLE

Engineering modes in optical fibers with metamaterial

Min YAN¹(

), Niels Asger MORTENSEN¹, Min QIU²

1. Department of Photonics Engineering, Technical University of Denmark, DTU-Fotonik, DK-2800 Kongens Lyngby, Denmark; 2. Department of Microelectronics and Applied Physics, Royal Institute of Technology, 16440 Kista, Sweden

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Abstract

In this paper, we report a preliminary theoretical study on optical fibers with fine material inclusions whose geometrical inhomogeneity is almost indistinguishable by the operating wavelength. We refer to such fibers as metamaterial optical fibers, which can conceptually be considered as an extension from the previously much publicized microstructured optical fibers. Metamaterials can have optical properties not obtainable in naturally existing materials, including artificial anisotropy as well as graded material properties. Therefore, incorporation of metamaterial in optical fiber designs can produce a new range of fiber properties. With a particular example, we will show how mode discrimination can be achieved in a multimode Bragg fiber with the help of metamaterial. We also look into the mean field theory as well as Maxwell-Garnett theory for homogenizing a fine metamaterial structure to a homogeneous one. The accuracies of the two homogenization approaches are compared with full-structure calculation.

Keywords optical fiber metamaterial Bragg fiber mode discrimination

Corresponding Author(s): YAN Min,Email:miyan@fotonik.dtu.dk

Issue Date: 05 June 2009

Cite this article:

Min YAN,Niels Asger MORTENSEN,Min QIU. Engineering modes in optical fibers with metamaterial[J]. Front Optoelec Chin, 2009, 2(2): 153-158.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0024-x
https://academic.hep.com.cn/foe/EN/Y2009/V2/I2/153

Fig.1 Schematic diagrams of metamaterial optical fibers with high birefringence. (a) Fiber with core made of 1D layered medium; (b) fiber with core made of two-dimensional (2D) nanostructured medium (gray region denotes material with higher refractive index than background)

Fig.2 (a)　　　　　　　(b)　　　　　　　 (c)
Schematic diagrams of three Bragg fiber cross-sections. (a) Conventional Bragg fiber with a homogeneous isotropic core; (b) Bragg fiber with a metamaterial core, which is made of subwavelength concentric bilayers; (c) Bragg fiber with a metamaterial core, which is made of subwavelength annular sectors (gray region denotes material with higher refractive index than background)

Fig.3 (a) 　　　　　　(b)
Dispersion (a) and loss (b) curves of second-order modes in a homogeneous-core Bragg fiber (notice the almost complete overlap of dispersion curves in (a))

Fig.4 Index profile along radial position for metamaterial-core Bragg fiber

Fig.5 (a)　　　　　　　　(b)
Dispersion (a) and loss (b) curves of TE and TM modes in a metamaterial-core Bragg fiber

Fig.6 (a) Relative error in value for MFT and MGT approximation models; (b) relative error in loss

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