在矽平板二維光子晶體波導中放置奈米金柱之濾波元件的光學特性研究

Study of the Characteristics of an Optical Filter based on a Two-Dimensional Photonic Crystal Slab Waveguide Structure with Periodical Gold Rods

李順昌(Shun-Chang Lee)

指導教授 ： 鄭旭志

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2014年)

摘要

本論文以Crystal Wave套裝軟體模擬來設計在矽平板二維光子晶體波導中放置奈米金柱之濾波元件，入射適當波長從左向右之TM Mode弦波脈衝光源入射光子晶體波導中，觀察研究其光學特性。而該矽平板波導結構計有四層，從最底層至最上層依序分別為二氧化矽基板，上層為矽，再上層為二氧化矽，最上層為矽。較小奈米金柱放置於較大空氣柱旁，空氣柱與奈米金柱均採蝕刻方式，經由變動奈米金柱數量暨位置，研究該濾波元件所得波長變化情形。
利用Crystal Wave套裝軟體進行有限時域差分法計算晶格常數與能帶間隙適合之波長值，分析數量及位置不同奈米金柱影響二維光子晶體波導中之穿透波強度及入射波衰減之光學現象，找出可應用於通訊用濾波器之波導。

關鍵字

光子晶體 ； 光子能隙 ； 金奈米柱 ； 表面電漿共振

並列摘要

In this thesis, Crystal Wave software is used to simulate a proposed filter device on the two dimensional slab photonic crystal waveguide, where a series of periodical gold rods are placed. The TM-mode lights are launched into the filter structure to analyze the optical characteristics of the device. The structure of the slab is composed of four layer stacks, which are SiO2 substrate, Si layer, SiO2 layer, and the top Si layer. The photonic crystal structure is formed in terms of air rods. The optimum conditions for gold rods are analyzed as well in this study.
By using the FDTD software, the band gap of the photonic crystal is calculated and the influence of the gold rods on the transmission spectrum is analyzed as well. By the simulation results, we conclude that such a proposed device is suitable for applying in optical communications.

並列關鍵字

photonic crystal ； photonic band gap ； nano gold atom rod ； surface plasmon resonance

參考文獻

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