Mid-infrared waveguide-integrated and photo-thermoelectric graphene photodetector based on germanium-on-silicon platform

IF 5.4 1区 物理与天体物理 Q1 OPTICS APL Photonics Pub Date : 2024-09-03 DOI:10.1063/5.0218976
Hongjun Cai, Changming Yang, Yuheng Liu, Xinliang Zhang, Yi Zou, Yu Yu
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Abstract

Mid-infrared (MIR) photonic integration is desirable in the development of MIR spectroscopy and “lab-on-a-chip” sensing. The germanium-on-silicon (GOS) platform offers a promising solution for MIR photonic integration, extending the operational wavelength to a longer band by eliminating the light-absorbing buried oxide layer. However, MIR photodetectors on the GOS platform remain undeveloped due to the challenging heterogeneous integration of active materials on silicon and inadequate light absorption in the photodetection region. Here, we demonstrate a photo-thermoelectric graphene photodetector on the GOS platform, taking advantage of zero-bias operation and easy heterogeneous integration of graphene. By employing split-gate architecture and plasmonic enhancement to strengthen the light-graphene interaction, we achieve a responsivity of 1.97 V W−1 and noise equivalent power of 2.8 nW Hz−1/2 at the wavelength of 3.7 µm. This work enables waveguide-integrated MIR photodetection on the GOS platform for the first time, and it holds great potential for on-chip MIR sensing and imaging applications.
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基于硅基锗平台的中红外波导集成和光热电石墨烯光电探测器
中红外(MIR)光子集成是发展中红外光谱仪和 "芯片实验室 "传感的理想选择。硅基锗(GOS)平台为中红外光子集成提供了一个前景广阔的解决方案,通过消除光吸收埋藏氧化层,将工作波长扩展到更长的波段。然而,由于硅上活性材料的异质集成具有挑战性,且光电探测区域的光吸收不足,GOS 平台上的中近红外光电探测器仍未得到开发。在这里,我们利用石墨烯的零偏置操作和易于异质集成的优势,在 GOS 平台上展示了一种光热电石墨烯光电探测器。通过采用分裂栅结构和等离子体增强技术来加强光与石墨烯之间的相互作用,我们在波长为 3.7 µm 时实现了 1.97 V W-1 的响应率和 2.8 nW Hz-1/2 的噪声等效功率。这项工作首次在 GOS 平台上实现了波导集成近红外光电探测,为片上近红外传感和成像应用带来了巨大潜力。
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来源期刊
APL Photonics
APL Photonics Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍: APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.
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