Yaqi Zhao

Non‐Contact Photoplethysmography for In‐Vehicle Health Monitoring With Seamlessly Integrated Photodetector Array and Hardware‐Accelerated AI

Yaqi Zhao, Haolan Xu, Xin Wang, Lan Wang et autres

ABSTRACT While non‐contact physiological monitoring offers clear advantages over contact‐based methods in dynamic environments such as intelligent vehicles, its practical deployment remains constrained by low signal‐to‐noise ratio (SNR) and susceptibility to motion artifacts. Here, we present an integrated in‐vehicle photoplethysmography (PPG) health …

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Biomimetic radial functional partitioning of shear-stiffening composite yarns for protection-sensing-decoupled intelligent PPE

Xue’er Li, Keke Gao, Yaqi Zhao, Murong Duan et autres

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Fabry–Pérot resonance cavity enabling highly polarization-sensitive long-wave infrared detector via double-layer linear grating

Xiangyu Zhang, W. M. He, Ye Zhang, Yaqi Zhao et autres

Au gratings are widely employed as the primary architecture in infrared linear polarization detectors; however, they suffer from significant optical losses in the long-wave infrared range, resulting in limited extinction ratios. In this study, we present a highly polarization-sensitive Au/SiO2 double-layer linear …

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Two-dimensional InAs/GaSb van der Waals heterostructures: interface engineering and infrared optoelectronic properties

Guowang Yu, Xiaoning Guan, Yanan Zhang, Yaqi Zhao et autres

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Advancing Flexibility and Sunlight Absorption of Two-Dimensional Janus Heterojunctions of MXY/Graphene (M = Mo, W; X = S, Y = Se)

Jiaxin Zhang, Yuchen Gao, Jie Li, Yaqi Zhao et autres

van der Waals (vdW) heterojunctions with rich interfacial properties and unique photophysical properties have become the focus of nanoscience due to their great potential applications in high-frequency optoelectronic devices and the flexible equipment field. Herein, the mechanical and optoelectronic properties of vdW …

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Real-Time UV Light Monitoring via High-Responsivity Van der Waals Photodetector on SOI With MXene Contacts

Xin Wang, Haolan Xu, Zi-Hao Wang, Siyi Xie et autres

Herein, we demonstrate a high-responsivity van der Waals (vdW) ultraviolet (UV) photodetector monolithically integrated on silicon-on-insulator (SOI) using Ti3C2TxMXene electrode. Simulation-guided optimization identified a 55-nm top silicon layer as optimal, enabling a responsivity of 900 A/W@365 nm under 4 V bias achieved …

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Ambient‐Light‐Immune NIR Photodetector Based on WS 2 /SiHMs Heterojunction for Hypertension Taxonomy Via CNN Integration

Yaqi Zhao, Haolan Xu, Xin Wang, Lan Wang et autres

Abstract Hypertension is a leading cause of death globally and a critical risk factor for serious diseases. However, continuous monitoring and accurate acquisition of blood pressure (BP) values using photoplethysmography (PPG) techniques face significant challenges in daily life. High‐fidelity PPG waveform acquisition …

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Self‐Powered PbS CQDs Photodiode for High‐Resolution Underwater NIR Single‐Pixel Imaging

Yunbo Lu, Xin Wang, Yaqi Zhao, Haolan Xu et autres

Abstract Underwater imaging (UI) technology is of considerable importance in scientific, economic, and societal contexts. The utilization of underwater near‐infrared (NIR) single‐pixel imaging (SPI) has been posited as a potentially viable alternative to conventional imaging systems. Here, the successful utilization of a …

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Simulation and Cold Test of the G -Band Ultrawideband Double-Mode Staggered Double-Vane Traveling-Wave Tube

Pengpeng Wang, Yaqi Zhao, Tianyi Xu, Yitao Hou

Staggered double-vane traveling-wave tube has garnered significant attention due to its advantages of high power, wide band in high frequency, long service life, planar structure, suitable for high-current sheet electron beam and so on. In this paper, a G-band staggered double-vane travelingwave …

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A Proposal for a Uniform Magnetic Focusing System to Improve the Sheet Beam Transmission

Cunjun Ruan, Pengpeng Wang, Yaqi Zhao, Tianyi Xu

Sheet electron beam (SEB) has been widely concerned in high-power vacuum electronic devices (VEDs). By enlarging its transverse size, the current of SEB can be further increased under the premise of relatively low current density, thus greatly enhancing the output power. However, …

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Blood pressure and heart rate monitoring with high-responsivity self-powered PbS collodial quantum dots photodiode

Siyi Xie, Haolan Xu, Wenli Duan, Yaqi Zhao et autres

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Design of a Novel Reverse Magnetic System for Planar Three-Beam Array

Pengpeng Wang, Cunjun Ruan, Wenbo Wang, Yaqi Zhao

Planar multibeam vacuum electron devices (VEDs) offer enhanced output power in the terahertz (THz) band by increasing total beam current while maintaining appropriate current density. Their associated planar high-frequency interaction circuits also facilitate simplified microfabrication. However, the stable transmission of planar multibeam …

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