Mode-Selective by Phase-Matching Coupling to Guided Modes in Multilayer Germanium Grating for Narrow Linewidth in Wavelength Precision Photodetection

IF 2.4 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Journal Pub Date : 2025-03-31 DOI:10.1109/JPHOT.2025.3556440

Ching-Yu Hsu;Zingway Pei;Jia-Ming Liu

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Abstract

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 ultra-narrow 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.

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基于相位匹配耦合的窄线宽多层锗光栅导模选择

高效窄线宽光电探测器对于先进的光通信系统，特别是在密集波分复用（DWDM）应用中是至关重要的。本研究介绍了一种新型光电探测器，该探测器具有由亚波长光栅、Ge吸收层和SiO2/Si多层结构组成的多层结构。通过利用SiO2/ si约束模式的相位匹配耦合，具有光栅的器件在1550 nm处具有约97%的高吸光度峰和约1 nm的超窄线宽。它比先前的相位匹配光栅集成光电探测器窄10倍。利用二维光栅实现了器件的独立极化。此外，硅隔离层的加入增强了设计的灵活性，同时保持了性能。该光电探测器的带宽约为58 GHz，非常适合高速光通信应用。这项工作为克服当前光电探测器效率和光谱控制方面的限制提供了一条途径，为未来光子器件的创新铺平了道路。

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来源期刊

IEEE Photonics Journal ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS

CiteScore

4.50

自引率

8.30%

发文量

489

审稿时长

1.4 months

期刊介绍： Breakthroughs in the generation of light and in its control and utilization have given rise to the field of Photonics, a rapidly expanding area of science and technology with major technological and economic impact. Photonics integrates quantum electronics and optics to accelerate progress in the generation of novel photon sources and in their utilization in emerging applications at the micro and nano scales spanning from the far-infrared/THz to the x-ray region of the electromagnetic spectrum. IEEE Photonics Journal is an online-only journal dedicated to the rapid disclosure of top-quality peer-reviewed research at the forefront of all areas of photonics. Contributions addressing issues ranging from fundamental understanding to emerging technologies and applications are within the scope of the Journal. The Journal includes topics in: Photon sources from far infrared to X-rays, Photonics materials and engineered photonic structures, Integrated optics and optoelectronic, Ultrafast, attosecond, high field and short wavelength photonics, Biophotonics, including DNA photonics, Nanophotonics, Magnetophotonics, Fundamentals of light propagation and interaction; nonlinear effects, Optical data storage, Fiber optics and optical communications devices, systems, and technologies, Micro Opto Electro Mechanical Systems (MOEMS), Microwave photonics, Optical Sensors.