High-Speed Compact Plasmonic-PdSe2 Waveguide-Integrated Photodetector
High-Speed Compact Plasmonic-PdSe2 Waveguide-Integrated Photodetector
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DOI：
10.1021/acsphotonics.3c00453
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发表时间：
2023-10
期刊：
影响因子：
7
通讯作者：
Jia‐Hau Jian;Jianghong Wu;Chuyu Zhong;Hui Ma;Boshu Sun;Yuting Ye;Ye Luo;Maoliang Wei;
中科院分区：
文献类型：
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作者：
Jia‐Hau Jian;Jianghong Wu;Chuyu Zhong;Hui Ma;Boshu Sun;Yuting Ye;Ye Luo;Maoliang Wei;
波导集成光电探测器是集成光子电路中的重要组件，因为它们有助于将光转换为电信号。然而，光吸收和载流子收集可以显著影响器件性能。作为该问题的解决方案，等离子体激元槽波导将光能限制在光电导检测器中的亚波长尺度内，增强光吸收并提供极短的通道来收集载流子。二维货车德瓦尔斯层状硒化钯（PdSe 2）具有禁带宽度窄、载流子迁移率高的优点，是一种理想的通信波段光电探测器材料。在这项研究中，我们提出并实验验证了一种高速PdSe 2-等离子体激元波导集成光电探测器，其暗电流为4.5 μA，3 V时的本征响应率为560.1 mA·W− 1，此外，它具有32.3%的内量子效率，测量的3 dB带宽为17.5 GHz。该集成光电探测器满足光通信、微波光子学、传感和成像等各种关键应用的要求。
Waveguide-integrated photodetectors are essential components in integrated photonic circuits since they facilitate light conversion into electrical signals. Nonetheless, optical absorption and carrier collection can significantly affect the device performance. As a solution to this issue, plasmonic slot waveguides confine optical energy within a subwavelength scale in a photoconductive detector, enhancing optical absorption and providing extremely short channels to collect carriers. Two-dimensional van der Waals layered palladium selenide (PdSe2) exhibits the merits of a narrow bandgap and high carrier mobility, thus positioning it as a favorable candidate material for photodetectors operating at the telecommunication band. In this study, we propose and experimentally verify a high-speed PdSe2-plasmonic waveguide-integrated photodetector with a dark current of 4.5 μA and an intrinsic responsivity of 560.1 mA·W−1at 3 V. Additionally, it has an internal quantum efficiency of 32.3%, and the measured 3 dB bandwidth is 17.5 GHz. This integrated photodetector fulfills the requirements of various critical applications in optical communication, microwave photonics, sensing, and imaging.