Compact Bidirectional Metallic-Dielectric-Air Polarization Splitter Based on a Cascaded Grating

Author

Kun Li ; Feng Xiao ; Fan Lu ; Anshi Xu

Author_Institution

State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China

Volume

26

Issue

1

fYear

2014

fDate

Jan.1, 2014

Firstpage

54

Lastpage

57

Abstract

A compact bidirectional polarization splitter based on two cascaded sub-gratings in a metallic-dielectric-air (MDA) waveguide is proposed and theoretically analyzed. The normally incident beam coupled to the MDA waveguide is split into left-going TE- and right-going TM-polarized modes by the structure. The operation principle is clarified and a coupled-mode model is developed for facilitating design. The polarization extinction ratio better than 33 dB and crosstalk less than -41 dB for TE-polarized mode and the corresponding 36 and -28 dB for TM-polarized mode are achieved at the operating wavelength 850 nm.

Keywords

coupled mode analysis; diffraction gratings; light polarisation; optical beam splitters; optical crosstalk; optical design techniques; optical waveguides; MDA waveguide; TE-polarized mode; TM-polarized modes; cascaded subgratings; compact bidirectional metallic-dielectric-air polarization splitter; coupled-mode model; crosstalk; metallic-dielectric-air waveguide; polarization extinction ratio; wavelength 850 nm; Gratings; Mathematical model; Metals; Optical surface waves; Optical waveguides; Photonics; Plasmons; Engineered photonic nanostructures; gratings; metal-dielectric-air waveguide; surface waves;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2289016

Filename

6655899