具有單向傳輸特性之表面電漿子波導管

Plasmonic Waveguides with One-way Transmission Characteristics

何叔憶(Shu-Yi Ho)

指導教授 ： 李佳翰

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2011年)

https://doi.org/10.6342/NTU.2011.01050

摘要

近年來，如何達成大量又快速的訊號傳輸成為一個重要的議題。在此，我們利用時域有限差分法設計模擬並探討以銀奈米結構組成的表面電漿子波導管在單方向傳遞光訊號的現象，以期此最佳化設計能擁有如二極體的功效。經由模擬數據分析，我們得到非對稱結構的不連續性以及金屬在可見光頻域的材料特性為兩項重要因素影響波導管單行傳輸訊號的可行性。實驗製程及量測方面，在考慮半導體製程可行性之下，我們提出可以利用聚焦離子束顯微鏡製作銀奈米結構之表面電漿子單行波導管，且規劃近場實驗架構量測其光訊號傳遞行為。

關鍵字

表面電漿子 ； 波導管 ； 穿透率 ； 最佳化 ； 單行道

並列摘要

Recently, the plasmonic devices and their integrated systems were proposed to transmit or to control the optical or electronical signals in the wafer-based platform. One of the most important devices to complete the plasmonic circuits is the waveguide. In this research, we study and design the one-way plasmonic waveguide to complete the functionality using finite-difference time-domain method. To achieve the nonreciprocal function, numerical analysis considered in this research includes the aperiodic metal-insulator-metal surface plasmonic waveguide. In the two-dimensional asymmetric gratings, we demonstrate several plasmonic waveguide designs in which light can propagate only one way. From the simulation data analysis, the discontinuity of the asymmetrical structures and the material characteristics for metal in the visible light frequencies are two of the important factors for making the one-way waveguide transmission being practicable. In the fabrication process, we considered the feasibility of the semiconductor manufacturing process and proposed to realize the silver/air/silver one-way surface plasmonic waveguides by using the focused ion beam. In the experimental part, we plan the framework of the near-field experiment to measure the transmitted behavior of the optical signal.

並列關鍵字

plasmonics ； waveguide ； transmission ； optimization ； one-way

參考文獻

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