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Title: Multidimensional detection enabled by twisted black arsenic–phosphorus homojunctions
Authors: Wang, Fakun
Zhu, Song
Chen, Wenduo
Han, Jiayue
Duan, Ruihuan
Wang, Chongwu
Dai, Mingjin
Sun, Fangyuan
Jin, Yuhao
Wang, Qi Jie
Keywords: Physics
Issue Date: 2024
Source: Wang, F., Zhu, S., Chen, W., Han, J., Duan, R., Wang, C., Dai, M., Sun, F., Jin, Y. & Wang, Q. J. (2024). Multidimensional detection enabled by twisted black arsenic–phosphorus homojunctions. Nature Nanotechnology.
Project: MOE-T2EP50120-0009 
Journal: Nature Nanotechnology 
Abstract: A light field carrying multidimensional optical information, including but not limited to polarization, intensity and wavelength, is essential for numerous applications such as environmental monitoring, thermal imaging, medical diagnosis and free-space communications. Simultaneous acquisition of this multidimensional information could provide comprehensive insights for understanding complex environments but remains a challenge. Here we demonstrate a multidimensional optical information detection device based on zero-bias double twisted black arsenic–phosphorus homojunctions, where the photoresponse is dominated by the photothermoelectric effect. By using a bipolar and phase-offset polarization photoresponse, the device operated in the mid-infrared range can simultaneously detect both the polarization angle and incident intensity information through direct measurement of the photocurrents in the double twisted black arsenic–phosphorus homojunctions. The device’s responsivity makes it possible to retrieve wavelength information, typically perceived as difficult to obtain. Moreover, the device exhibits an electrically tunable polarization photoresponse, enabling precise distinction of polarization angles under low-intensity light exposure. These demonstrations offer a promising approach for simultaneous detection of multidimensional optical information, indicating potential for diverse photonic applications.
ISSN: 1748-3387
DOI: 10.1038/s41565-023-01593-y
Schools: School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2024, The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at
Fulltext Permission: embargo_20240722
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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