Facility Agricultural: Green Energy Development and Carbon Offset【Graduate Institute of Optoelectronic Engineering / Pei, Zingway / Distinguished Professor】
設施農業：農業綠能開發與碳匯補償【光電工程研究所/裴靜偉特聘教授】
| 論文篇名 | Mode-Selective by Phase-Matching Coupling to Guided Modes in Multilayer Germanium Grating for Narrow Linewidth in Wavelength Precision Photodetection |
| 期刊名稱 | IEEE PHOTONICS JOURNAL |
| 發表年份,卷數,起迄頁數 | 2025, 17(3), no.2200410 |
| 作者 | Hsu, Ching-Yu; Pei, Zingway(裴靜偉)*; Liu, Jia-Ming |
| DOI | 10.1109/JPHOT.2025.3556440 |
| 中文摘要 | 高效率且線寬極窄的光偵測器是先進光通訊系統——尤其是密集波長分波多工（DWDM）應用——的關鍵元件。本研究提出一種新型多層結構光偵測器，包含次波長光柵、鍺（Ge）吸收層與 SiO₂/Si 多層膜。透過 SiO₂/Si 局限模的相位匹配耦合，具光柵元件在 1550 nm 處展現出約 97% 的高吸收峰，線寬僅約 1 nm，比先前整合相位匹配光柵的光偵測器縮窄 10 倍。利用二維光柵設計，元件可達偏振無關操作；加入矽間隔層則在維持性能的同時提升設計靈活性。元件示範頻寬約 58 GHz，適用於高速光通訊。本研究為突破現有光偵測器效率與光譜控制瓶頸提供新途徑，並為未來光子元件創新鋪路。 |
| 英文摘要 | High-efficiency and narrow-linewidth photodetectors are critical for advanced optical communication systems, especially in dense wavelength division multiplexing (DWDM) applications. This study introduces a novel photodetector featuring a multilayer structure comprising a subwavelength grating, a Ge absorption layer, and a SiO2/Si multilayer. By utilizing the phase-matching coupling of SiO2/Si-confined modes, the devices with the gratings demonstrate a high absorbance peak of ∼97% with an ultranarrow linewidth of ∼1 nm at 1550 nm. It is 10 times narrower than those of previous works of photodetectors integrated with phase-matching gratings. By utilizing the two-dimensional grating, the device performs polarization independently. Additionally, the inclusion of a Si spacer layer enhances design flexibility while maintaining performance. With a demonstrated bandwidth of approximately 58 GHz, the proposed photodetector is well-suited for high-speed optical communication applications. This work provides a pathway to overcoming current limitations in photodetector efficiency and spectral control, paving the way for future innovations in photonic devices. |
| 發表成果與本中心研究主題相關性 | 此一設計可提升紅外光收光能力，未來可以應用在紅外光訊號傳輸，保障農業設施夜間安全。 |
