Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/90509
標題: Anisotropic Hybrid Plasmonic Waveguide
異向性混合電漿子波導
作者: Yu-Cheng Lo
羅友成
關鍵字: 異向性材料;液晶;混合電漿子波導;光波導;極化分離器;anisotropic materials;liquid crystal;hybrid plasmonic waveguide;optical waveguide;polarization beam splitter
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摘要: 
近年來異向性材料廣泛被應用於光積體電路之製作的趨勢,其介電係數在空間中各方向不同的優點可取代傳統用幾何造成空間不對稱性以分光的辦法,利用可調控的異向性材料,使用者可透過施加外電場以調整通過元件之極化光,除此也可簡化元件在結構上的複雜度,在微縮元件方面,因為本極化器應用了混合電漿子波導效應,除了能突破繞射極限、令訊號的光場侷域至寬度5奈米的間隙內,還有比表面電漿波能量損耗更低、傳遞長度達30微米以上的優點。不僅如此,異向性混合電漿子極化器的核心僅容許單一TE及TM模態在其中傳遞,避免了多模傳輸訊號不良的問題。利用異向性材料「4-戊基-4'-氰基聯苯」所製之極化器,元件尺寸能縮至五百奈米以下,消光比可達15至20dB,插入損耗也約在2dB上下。而若要再進一步強化消光能力和減少能量耗損,則可繼續往具有較高介電係數之異向性材料之方向研究,以實現整合積體光電路之目標。

Recently, anisotropic materials have been popular in designing and manufacturing of photonic integrated circuits. We adopted the anisotropic materials, to design polarizer beam splitters because of the flexibility and controllability of materials. In the thesis, we employed 4-Cyano-4'-pentylbiphenyl (5CB liquid crystal) to design an anisotropic hybrid plasmonic wavguide, which simplifies the configuration of polarizer beam splitter, and a straight waveguide structure, increases the simplicity and device density of photonic integrated circuit. In addition, the proposed hybrid plasmonic waveguide effectively shrinks the mode area, and increases propagation length. With controlling the structure parameters and external electric field, the performances of the proposed design can be flexibly adjusted. After optimizing the parameters of mode characteristics, we design polarization beam splitter with high extinction ratio of about 20 dB and insertion loss of 2.19 dB.
URI: http://hdl.handle.net/11455/90509
Rights: 同意授權瀏覽/列印電子全文服務,起公開。
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