Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/90484
標題: Designs of Polarizers Based on Hybrid Plasmonic Waveguide Structures
利用混合電漿波導設計多種極化器
作者: Ken-Wei Chang
張根維
關鍵字: 混合型電漿波導;TE-pass極化器;極化器;轉彎結構;消光比;Hybrid plasmonic waveguide;TE-pass polarizer;polarizer;bent structure;extinction ratio
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摘要: 
本論文利用混合電漿波導設計三種不同的極化器,達到縮小元件尺寸同時維持良好性能。第一種是TE-pass極化器,利用週期性的結構變化讓TM mode快速損耗,達成TE-pass的功能,當元件長度L = 800 、1800與3000 nm時,極化消光比分別可達10 dB、15 dB與19.14 dB,且具有低插入損耗特性。第二種為具轉彎結構的極化器,省去一般耦合的步驟,直接將TE模態進行九十度彎曲波導的轉彎,使TE和TM模態直接分離,達到縮小元件尺寸的目的,在彎曲波導的曲率半徑R = 250 nm時,TE 模態消光比可達到10.7 dB和插入損耗0.27 dB,而TM 模態消光比可達到14.2 dB和插入損耗0.19 dB,因此具有一個極小的元件尺寸,面積約為375×375 ?nm?^2。第三種極化器具斜走結構,我們設計讓TE模態在入射後,直接進行斜向的傳播,達到將TE和TM模態分離的目的,在面積為850×1000 ?nm?^2下,具有良好的TE和TM 模態消光比為17.1 dB和19.3 dB和低的插入損耗為1.21 dB和0.32 dB。

We design three different waveguide polarizers using the hybrid plasmonic waveguide concept to shrink the component size while maintaining good transmission performance. The first one we propose is a TE-pass polarizer by changing structure periodically in order to quickly loss TM polarization. When the element lengths are L = 800, 1800 and 3000 nm, the polarization extinction ratios are 10 dB, 15 dB and 19.14 dB, respectively, with a low insertion loss. The second polarizer is a bent waveguide structure. We separate TE mode from TM mode by turning TE mode ninety degrees along the bent waveguide but keep the TM mode propagating straight. For the radius of curvature R = 250 nm, the extinction ratio of TE and TM polarizations are 10.7 and 14.2 dB, respectively, and the insertion loss are as low as 0.27 dB and 0.19 dB for TE and TM polarizations, respectively. With this design, the device has a footprint as small as 375×375 ?nm?^2. The third one is with oblique propagation structure. The TE mode is designed to be oblique propagation and the TM mode propagates straight. The area of this design is 850×1000 ?nm?^2 with the extinction ratios 17.1 and 19.3 dB and the insertion losses 0.32 dB and 0.88 dB for TE and TM polarizations, respectively.
URI: http://hdl.handle.net/11455/90484
Rights: 同意授權瀏覽/列印電子全文服務,2016-08-31起公開。
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