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研究生: 張詣
Yi Chang
論文名稱: 玻璃基板之矽光子波導研究
Silicon Photonic Waveguide Structures on Glass Substrates
指導教授: 王培勳
Pei-Hsun Wang
王智明
Chih-Ming Wang
口試委員:
學位類別: 碩士
Master
系所名稱: 理學院 - 光電科學與工程學系
Department of Optics and Photonics
論文出版年: 2025
畢業學年度: 113
語文別: 中文
論文頁數: 118
中文關鍵詞: 玻璃基板波導高品質因子共振腔接觸式微影技術共封裝光學
外文關鍵詞: glass, waveguides, high-Q resonators, contact lithography,, co-packaged optics (CPO)
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  • 隨著數位科技的迅速發展,現今社會對於高頻寬、低延遲與高效能的資訊傳輸需求日益增加。光通訊技術作為突破電子電路頻寬限制的關鍵解決方案,已被廣泛應用於長距離與高速資料傳輸系統中。矽光子技術(Silicon Photonics)憑藉其高度整合性與金氧半導體(CMOS)製程的相容性,可將光學元件整合於單一晶片上,實現低成本、低損耗與高效率的光電轉換平台。然而,矽光子技術在材料選擇與製程條件方面仍面臨限制,特別是在異質整合與封裝彈性方面。
    為克服上述挑戰,本研究選擇玻璃基板作為異質整合平台材料,充分利用其低折射率、高平坦度、尺寸穩定性與低介電損耗等特性,有效提升光學隔離與高頻傳輸能力。玻璃基板支援大面積製造技術,如扇出式面板封裝(FOPLP),不僅可降低成本,亦具高機械強度與抗翹曲性,適用於虛擬實境(VR)、增強實境(AR)及共封裝光學(CPO)等先進光子系統應用。
    本研究探討聚合物材料應用於光子元件之潛力,特別是在高品質波導製作方面,包含單層聚合物波導與結合氮化矽(Si₃N₄)或非晶矽(a-Si:H)之混合波導結構。透過紫外接觸式微影技術於玻璃基板上圖形化波導,實現低成本、低損耗之製程流程。提升導光能力並縮小彎曲半徑,本研究引入低粗糙度(<2 nm)的氮化矽薄膜與高折射率非晶矽層,以提高波導的折射率對比,實現更緊湊的光學彎曲並優化晶片面積。
    此外,本研究亦成功製作聚合物微環共振器並整合金屬加熱器與氧化層絕緣結構,實現熱調變功能,當以 PECVD 所沉積之 SiO₂ 作為間隔層時,其靈敏度可達 2.27 pm/mW。並針對 TiO₂ 與 a-Si:H 等高折射率材料進行共振驗證,確認其具備製程穩定性與整合潛力。
    在架構設計上,提出具可調耦合強度之垂直耦合波導設計,結合下層氮化矽微環與上層 SU-8 波導,藉由控制中間氧化層厚度(0.5–2 μm)調整耦合效率,並形成 Drop-port 能量輸出結構。進一步擴展為多微環耦合陣列,展現應用於光子路由器與高密度訊號分配模組之潛力。
    綜上所述,本論文建立一套以玻璃基板為核心之低溫異質整合光子元件製程平台,涵蓋材料選擇、結構設計、製程整合與光學驗證,具備應用於光子積體電路(PICs)與共封裝光學(CPO)系統之技術潛力與擴展性。


    With the rapid advancement of digital technologies, the demand for high-bandwidth, low-latency, and high-performance data transmission continues to grow. Optical communication has emerged as a key solution to overcome the bandwidth limitations of electronic circuits and has been widely adopted in long-distance and high-speed data transmission systems. Silicon photonics, with its high integration density and compatibility with complementary metal-oxide-semiconductor (CMOS) processes, It enables low-cost, low-loss, and high-efficiency optical interconnects on a single chip. However, silicon photonics still faces challenges related to material and process limitations, particularly in heterogeneous integration and packaging flexibility.
    To address these challenges, this study adopts glass substrates as a heterogeneous integration platform. Glass offers several inherent advantages, including a low refractive index for optical isolation, high flatness, dimensional stability, and low dielectric loss, making it suitable for high-frequency signal transmission. Its compatibility with large-area manufacturing techniques, such as fan-out panel-level packaging (FOPLP), also reduces cost and enhances throughput. Furthermore, the mechanical robustness of glass substrates provides excellent resistance to warpage, making them ideal for emerging applications in virtual reality (VR), augmented reality (AR), and co-packaged optics (CPO).
    This work explores the potential of polymer materials in photonic integration, particularly in the fabrication of high-quality waveguides. Both single-layer SU-8 polymer waveguides and hybrid waveguide structures incorporating silicon nitride (Si₃N₄) or amorphous silicon (a-Si:H) were investigated. Using ultraviolet (UV) contact lithography, we successfully patterned waveguides directly on glass substrates without relying on advanced lithography equipment. By integrating smooth PECVD-deposited Si₃N₄ films (<2 nm surface roughness, 50–100 nm thickness) or 400 nm a-Si:H layers, the refractive index contrast was enhanced, enabling tighter waveguide bending and reduced chip footprint.
    High-quality polymer microring resonators were demonstrated, achieving an intrinsic quality factor Qi exceeding 1.2×105. In addition, metal heaters were integrated with SiO₂ insulation layers to realize thermo-optic tuning. The highest tuning sensitivity of 2.27 pm/mW was achieved using SiO₂ cladding. TiO₂ and a-Si:H ring resonators were also fabricated and tested, verifying their feasibility for integration and resonance performance.
    A vertically coupled waveguide structure was further developed, utilizing SU-8/Si₃N₄ stacked layers and PECVD SiO₂ as the tunable coupling gap. This structure enabled efficient Drop-port output and multi-ring coupling design. The platform combines low-temperature fabrication, structural flexibility, and multi-material integration capabilities. It offers promising potential for advanced photonic integrated circuits (PICs), high-density photonic routing, and co-packaged optical interconnects.

    國立中央大學圖書館學位論文授權書 I 國立中央大學碩士班研究生論文指導教授推薦書 II 國立中央大學碩士班研究生論文口試委員審定書 III 摘要 IV ABSTRACT VI 誌謝 VIII 目錄 IX 圖目錄 XII 表目錄 XV 第一章 緒論 1 1-1 矽光子技術簡介 1 1-2 共封裝光學(CPO)技術與研究現況 2 1-3 微環形共振腔介紹 3 1-4 基板材料選擇與特性 7 1-5 矽光子波導材料分析 8 1-6 研究動機 9 1-7 論文概要 11 第二章 研究方法與製程平台總覽 12 2-1 製程設備 12 2-1-1 薄膜製程設備 12 2-1-2 微影與塗佈設備 13 2-1-3 蝕刻機台 15 2-2 穿透光譜量測架構 17 第三章 模擬方法與結構分析 22 3-1 模擬方法與工具介紹 22 3-1-1 有限元素法(FEM):FEMSIM 模態模擬 22 3-1-2 有限差分時域法(FDTD):FullWAVE 傳輸模擬 23 3-2 波導的有效折射率之模擬 26 3-2-1 氮化矽(Si₃N₄)波導模態場與有效折射率 27 3-2-2 純 SU-8 波導模態場與有效折射率 28 3-2-3 低限制聚合物(SU-8)和氮化矽(Si₃N₄)混合型波導模態 30 3-2-4 低限制聚合物(SU-8)和非晶矽(a-Si:H) 波導模態 32 3-2-5 混合型波導模態三種結構比較與模擬總結 34 3-2-6 非晶矽(a-Si:H)波導模態場與有效折射率 35 3-2-7 二氧化鈦(TiO2)波導模態場與有效折射率 36 3-3 彎曲損耗模擬與傳輸行為分析 37 3-4 波導寬度對於模態數之影響 40 3-4-1 純 SU-8 波導模態數分析 40 3-4-2 SU-8 與 Si₃N₄ 混合波導模數態分析 41 3-4-3 SU-8 與 a-Si:H 混合波導模數態分析 43 第四章 玻璃基板波導製程與量測結果 44 4-1 氮化矽(Si₃N₄)波導製程流程 45 4-2 純聚合物(SU-8)波導製程流程 47 4-3 不同混合型波導製程流程 48 4-3-1 聚合物(SU-8)和氮化矽(Si₃N₄)混合型波導 48 4-3-2 聚合物(SU-8)和非晶矽(a-Si:H)混合型波導 49 4-4 非晶矽(a-Si:H)波導製程流程 50 4-5 二氧化鈦(TiO2)波導製程流程 51 4-6 薄膜沉積與表面品質分析 52 4-6-1 氮化矽薄膜之沉積 52 4-6-2 非晶矽薄膜之沉積 53 4-6-3 二氧化鈦薄膜之沉積 53 4-6-4 薄膜沉積表面粗糙度 54 4-7 黃光微影製程與實驗步驟 56 4-8 微加熱器之製程 61 4-8-1 使用 PDMS 為中介層之金屬圖樣製程 61 4-8-2 使用 PECVD SiO₂ 為中介層之金屬圖樣製程 64 4-9 光學量測結果 66 4-9-1 玻璃基板光學響應與模擬結果對照分析 66 4-9-2 微加熱器熱調變對光譜響應之影響 77 第五章 聚合物(SU-8)垂直耦合波導之製程與量測結果 80 5-1 chip-to-chip 垂直耦合技術整合平台 80 5-2 聚合物(SU-8)垂直耦合波導製程流程 82 5-3 二氧化矽隔絕層薄膜之沉積 85 5-4 氮化矽薄膜之沉積 86 5-5 垂直耦合上下層波導微影製程 87 5-5-1 下層Si₃N₄製程與圖案定義 87 5-5-2 上層 SU-8 波導製程 89 5-6 氮化矽圖案蝕刻製程 90 5-7 披覆層之沉積 92 5-8 Drop-port 光譜量測與耦合效率分析 93 第六章 結論 與未來展望 95

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