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Fiber-Endface-Integrated PdSe2/2H-MoTe2 Heterojunction Photodetector for Broadband Linear-Polarization Detection
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DOI：10.1002/admi.70550.png)
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Abstract
En 中文
The development of next-generation optical networks demands miniaturization, polarization discrimination, and broadband operation. Compared to current complex systems with numerous bulky opto-electro-mechanical elements arranged in tandem along the optical path, the integration of a polarization-sensitive detector within optical fiber systems provides a new route for realizing compact polarized optical networks. However, most of these devices cannot be seamlessly integrated with mainstream optical fiber systems. Here, we propose a fiber-integrated polarimeter by stacking a PdSe2/2H-MoTe2 van der Waals (vdW) heterojunction onto the facet of a standard optical fiber, constructing a high-performance polarization detector with a responsivity of 25 mA/W, a polarization ratio of approximately 2, and a relatively fast response time of 59 µs at 1550 nm. Additionally, benefiting from the broadband light absorption of PdSe2/2H-MoTe2 heterojunction, the devices demonstrate a broad spectral response range from 532 nm to 1630 nm. Leveraging its intrinsic polarization sensitivity, we demonstrate a polarization-encoded secure communication scheme. Combining broadband operation, polarization selectivity, and structural simplicity in a fiber-native form, this work establishes a compact and multifunctional platform for polarization demodulation, monitoring, and secure optical communication in integrated fiber systems.
Keywords:
broadband
fiber-endface-integrated
photodetectors
polarization
vdW heterojunction
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