本文選題：石墨烯 + 光子晶體波導(dǎo)��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：為了促進(jìn)全光通信網(wǎng)絡(luò)的發(fā)展,滿足全光通信網(wǎng)絡(luò)中的關(guān)鍵器件一全光緩存器一日益增長(zhǎng)的需求,本文主要設(shè)計(jì)了基于石墨烯的等效光子晶體慢光波導(dǎo),并對(duì)石墨烯慢光波導(dǎo)用于全光緩存進(jìn)行了研究,本文主要完成了以下三方面的工作。首先,我們驗(yàn)證了石墨烯作為慢光材料的可行性,并且在石墨烯上構(gòu)造了折射率周期變化的等效光子晶體寬帶慢光波導(dǎo),在此基礎(chǔ)上使用平面波展開(kāi)法仿真其能帶曲線。我們提出了基于石墨烯的45度晶格光子晶體線缺陷慢光波導(dǎo),在設(shè)定的材料參數(shù)和結(jié)構(gòu)參數(shù)下,當(dāng)入射波的頻率f在29.9THzf30.6THz之間變化時(shí),波導(dǎo)的平均群折射率維持在(137.2±4)左右,慢光的相對(duì)帶寬達(dá)到2.31%,歸一化延遲帶寬積高達(dá)3.17。在此頻率范圍內(nèi)群折射率可視為是一個(gè)常數(shù)值,呈現(xiàn)出慢光效應(yīng),實(shí)現(xiàn)了慢光的傳輸。此外,我們通過(guò)控制施加在石墨烯上的偏壓可以有效地調(diào)節(jié)慢光的中心頻率f,群折射率ng,慢光帶寬等參數(shù)。第二,為了進(jìn)一步研究耦合腔型的等效光子晶體慢光結(jié)構(gòu)的特性,我們又設(shè)計(jì)了兩種等效光子晶體耦合腔慢光結(jié)構(gòu)-60度晶格耦合腔慢光結(jié)構(gòu)和90度晶格耦合腔慢光結(jié)構(gòu)。在60度晶格耦合腔波導(dǎo)中,當(dāng)入射波的頻率在29.62THz-30.02THz范圍變化時(shí),波導(dǎo)的群折射率保持在(177.5± 10)左右,歸一化延遲帶寬積達(dá)到2.38。在90度晶格耦合腔波導(dǎo)中,當(dāng)入射波的頻率在28.7THz-29.5THz范圍變化時(shí),波導(dǎo)的群折射率保持在(142.5±7.9)左右,歸一化延遲帶寬積高至3.92,極大地改善了慢光波導(dǎo)的性能。最后,我們?cè)敿?xì)地介紹了慢光緩存器的原理以及衡量慢光緩存器性能參數(shù),并且將我們?cè)O(shè)計(jì)的三種慢光波導(dǎo)結(jié)構(gòu)帶入計(jì)算公式進(jìn)行了定量地分析,通過(guò)理論計(jì)算和比較,90度晶格耦合腔慢光結(jié)構(gòu)性能相對(duì)優(yōu)異,緩存容量高達(dá)331.6比特,延時(shí)時(shí)間最長(zhǎng)為475.00皮秒,比特長(zhǎng)度最大為3.0微米。
[Abstract]:In order to promote the development of all-optical communication network and meet the increasing demand of all-optical buffer, an equivalent photonic crystal slow optical waveguide based on graphene is designed. The application of graphene slow optical waveguide to all optical buffer is studied. Firstly, we verify the feasibility of graphene as a slow light material, and construct an equivalent photonic crystal broadband slow optical waveguide with periodic refractive index variation on graphene. On this basis, the energy band curves are simulated by plane wave expansion method. We propose a 45 degree lattice photonic crystal line defect slow optical waveguide based on graphene. When the frequency of incident wave f varies between 29.9 THzf30.6 THz, the average group refractive index of the waveguide is maintained at (137.2 鹵4) under the given material and structure parameters. The relative bandwidth of slow light is 2. 31 and the normalized delay bandwidth product is 3. 17. In this frequency range, the group refractive index can be regarded as a constant value, showing slow light effect and realizing the propagation of slow light. In addition, we can effectively adjust the central frequency of slow light, group refractive index, slow light bandwidth and so on by controlling the bias applied on graphene. Secondly, in order to further study the characteristics of the equivalent photonic crystal slow light structure of coupling cavity, we also design two kinds of equivalent photonic crystal coupling cavity slow light structure -60 degree lattice coupling cavity slow light structure and 90 degree lattice coupled cavity slow light structure. When the frequency of the incident wave changes in the range of 29.62THz-30.02THz, the group refractive index of the waveguide remains at (177.5 鹵10) and the normalized delay bandwidth product reaches 2.38 in the 60-degree lattice coupled cavity waveguide. In a 90 degree lattice coupled cavity waveguide, when the frequency of the incident wave varies in the range of 28.7THz-29.5 THz, the group refractive index of the waveguide remains at (142.5 鹵7.9), and the normalized delay bandwidth product is up to 3.92, which greatly improves the performance of the slow optical waveguide. Finally, we introduce the principle of slow light buffer and the performance parameters of slow light buffer in detail, and introduce three kinds of slow optical waveguide structure into the calculation formula to carry out quantitative analysis. By theoretical calculation and comparison, the lattice-coupled cavity has excellent performance, with a buffer capacity of up to 331.6 bits, a delay time of 475.00 picoseconds and a maximum bit length of 3.0 渭 m.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN252;TN929.1

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本文編號(hào)：2054662