Cylinder and metal grating polarization beam splitter. Issue 14 (6th August 2017)

• Record Type: Journal Article
• Authors: Yang, Junbo; Xu, Suzhi
• Is Part Of: Journal of modern optics. Volume 64:Issue 14(2017)
• Page Start: 1404
• Page End: 1410
• Publication Date: 2017-08-06
• Subjects: Beam splitter -- grating coupler -- rigorous coupled-wave analysis (RCWA) -- finite-difference time-domain (FDTD); Optics -- Periodicals; 535
• DOI: 10.1080/09500340.2017.1291860
• Languages: English
• ISSNs: 0950-0340

Abstract

Abstract: We propose a novel and compact metal grating polarization beam splitter (PBS) based on its different reflected and transmitted orders. The metal grating exhibits a broadband high reflectivity and polarization dependence. The rigorous coupled wave analysis is used to calculate the reflectivity and the transmitting spectra and optimize the structure parameters to realize the broadband PBS. The finite-element method is used to calculate the field distribution. The characteristics of the broadband high reflectivity, transmitting and the polarization dependence are investigated including wavelength, period, refractive index and the radius of circle grating. When grating period d = 400 nm, incident wavelength λ = 441 nm, incident angle θ = 60° and radius of circle d /5, then the zeroth reflection order R 0 = 0.35 and the transmission zeroth order T 0 = 0.08 for TE polarization, however, T 0 = 0.34 and R 0 = 0.01 for TM mode. The simple fabrication method involves only single etch step and good compatibility with complementary metal oxide semiconductor technology. PBS designed here is particularly suited for optical communication and optical information processing.