A Branch-Type TE/TM Wave Splitter Using a Light-Guiding Metal Line
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The three-dimensional (3-D) beam-propagationmethod is applied to the analysis of a novel transverse electric/transverse magnetic (TE/TM) wave splitter using a light-guidingmetal (Ag) line with an embedded dielectric (SiO2) waveguide.Before analyzing the splitter, a mode converter with a taperedmetal is designed to smoothly convert the guided mode of anembedded waveguide into the surface plasmon-polariton (SPP)mode, and vice versa. After demonstrating the effectiveness of aconverter consisting of a two-step linear taper, the performanceof the splitter is evaluated. To obtain a high coupling efficiency,the wavefront mismatch of the SPP mode is compensated for.In addition, a TE-pass polarizer is added to the TE outputwaveguide, reducing the undesirable TM wave. In contrast tothe long device length of a conventional branch-type splitter(> 1000 μm), the present splitter is found to have a noticeablyshort device length of less than 200 μm, although a loss of about3 dB is observed for the TMwave. The crosstalk and the extinctionratio are, respectively, evaluated to be less than −15 dB and morethan 15 dB for a branching angle of 16 ± 2◦ at wavelengths of1.31 and 1.55 μm.
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