Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2289016
