Polarization‐Sensitive Artificial Optoelectronic Synapse Based on Anisotropic β‐Ga₂O₃ Single Crystal for Neuromorphic Vision Systems and Information Encryption

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(29)

Published: June 25, 2024

Abstract A novel polarization‐sensitive artificial optoelectronic synapse based on β ‐Ga 2 O 3 single‐crystal is proposed in this work, featuring reconfigurable anisotropic vision. series of synaptic activities and image recognition functions are successfully simulated using device. The intriguing performance device, stems from the crystal anisotropy , which confirmed through polarization Raman measurements first‐principles theoretical calculations. Furthermore, a comprehensive analysis persistent photoelectric properties device unveils that adaptability ionization dissociation oxygen vacancies. Ultimately, utilized fields information encryption. four‐layer neural network with two hidden layers constructed for recognizing handwritten digits. After training, accuracy reaches over 91.5% both unpolarized polarized light. Information encryption achieved by controlling states. enables data generation to be conducted same platform, mitigating exposure risks during transmission significantly enhancing security confidentiality. This work presents new opportunities future applications polarization‐based perception systems.

Language: Английский

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2D Materials‐Based Photodetectors with Bi‐Directional Responses in Enabling Intelligent Optical Sensing

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 19, 2025

Abstract With the rapid advancement of 2D material‐based optoelectronic devices, significant progress is made in development all‐optical logic synaptic biomimetic and multidimensional detection systems. As entering to high‐speed information era, there an urgent demand for complex, compact, multifunctional, low‐energy, intelligent sensing chips. Examining evolution current technologies reveals a parallel bipolar response mechanisms‐from simple positive negative responses more intricate inhibition‐promotion dynamics with persistent characteristics. This significantly broadens their applications devices. Moreover, compared unipolar responses, complex offer greater flexibility adaptation unique one‐to‐one mapping high‐dimensional parameters such as polarization, phase, spectrum, positioning them promising candidates breakthroughs resolution. In this review, design strategies are comprehensively explored various materials, highlighting deep advanced fields. It aimed review provide broad overview bi‐directional mechanisms, offering inspiration designing next generation

Language: Английский

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Structural and optoelectronic characterization of anisotropic two-dimensional materials and applications in polarization-sensitive photodetectors

Applied Physics Reviews, Journal Year: 2025, Volume and Issue: 12(1)

Published: Jan. 2, 2025

The omnipresence of polarized light on the surface earth, a result atmospheric scattering, underscores significance detecting this and extracting valuable information regarding phase polarization angle. In recent years, there has been surge in research polarization-sensitive photodetectors that utilize anisotropic two-dimensional (2D) materials. essence these 2D is rooted characteristics arise from asymmetric crystal lattice materials question. This anisotropy manifested both optical electrical behaviors due to asymmetrical nature structure. article systematically categorizes offers an insightful overview their structures. It also introduces various characterization techniques designed elucidate properties focus then shifts detailing current state realm material-based photodetectors. provides comprehensive description working principles behind with different structural designs, shedding underlying mechanisms enable sensitivity. conclusion, summarizes findings review, highlighting advancements challenges field. Additionally, review proposes several forward-looking recommendations guide future trajectory development domain

Language: Английский

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Advances in Bipolar Photodetectors: Working Principles, Constructions, and Applications

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract As a special type of photodetectors, the bipolar photodetectors (BPDs) have attracted extensive attention because their unique positive and negative outputs, endowing them attractive applications, such as optical communication, logic gate, imaging. However, there is still insufficient understanding working mechanisms device structures BPDs, which limits optoelectronic performances practical applications. This review focuses on principles, constructions, applications BPDs. First, fundamental principles BPDs are analyzed based structures, including photoconductors, photodiodes, phototransistors, photoelectrochemical others. Second, constructions different materials (2D materials, organic semiconductors, perovskites, III–V compounds, oxides, selenides) reviewed, discussed. Third, various summarized, Finally, challenges prospects delivered for developing state‐of‐the‐art It can be expected that this will provide valuable insights guidance future research

Language: Английский

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Simultaneous AoLP and DoLP Detection in a Bias‐Switchable PdSe₂/MoS₂/PdSe₂ Heterojunction for Polarization Discrimination

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

On-chip polarized photodetectors play a crucial role in advancing ultra-compact optoelectronic devices for next-generation technologies. However, simultaneously detecting the angle of linear polarization (AoLP) and degree (DoLP) within single device remains challenging task, particularly due to inherently weak states found naturally anisotropic materials. In this paper, it is reported on development twisted monopole barrier photodetector based PdSe2/MoS2/PdSe2 configuration. This features rapid response time 7-12 µs. an imaging demonstration, operates as single-polarization photodetector, reconstructing AoLP DoLP distributions target objects through bias-switchable detection across wide spectral range, all without plasmonic/metasurface nanostructures or filters. Additionally, demonstrates bipolar characteristics under zero-bias conditions at room temperature, enabling dual-binary coding polarimetric-encoded communication. These combination positions highly promising candidate on-chip applications.

Language: Английский

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An Ultrasensitive Bi₂O₂Se/In₂S₃ Photodetector with Low Detection Limit and Fast Response toward High-Precision Unmanned Driving

ACS Nano, Journal Year: 2024, Volume and Issue: 18(40), P. 27579 - 27589

Published: Sept. 24, 2024

The machine vision utilized in unmanned driving systems must possess the ability to accurately perceive scenes under low-light illumination conditions. To achieve this, photodetectors with low detection limits and a fast response are essential. Current rely on avalanche diodes or lidars, which come drawbacks of increased energy consumption complexity. Here, we present an ultrasensitive photodetector based two-dimensional (2D) Bi

Language: Английский

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2D Perovskite Heterojunction‐Based Self‐Powered Polarized Photodetectors with Controllable Polarization Ratio Enabled by Ferro‐Pyro‐Phototronic Effect

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Abstract Metal halide perovskites (MHPs) are commonly used in polarization‐sensitive photodetectors (PDs) for applications such as polarization imaging, remote sensing, and optical communication. Although various methods exist to adjust the photocurrent, a universal effective approach continuous control of MHPs’ optoelectronic polarized properties is lacking. A strategy electrically modulate ratio (PR) self‐powered PDs using ferro‐pyro‐phototronic effect (FPPE) 2D presented. By varying amplitude direction ferroelectric voltage, built‐in electric field heterojunction can be modulated, allowing controllable PR regulation adjustable characteristics. Moreover, pyroelectric photoresponses realized, significantly enhancing responsivity, response speed PDs. Both currents photocurrents exhibit obvious This method's versatility demonstrated by creating three additional quasi‐2D MHP ferroelectric‐based polarized‐sensitive proof‐of‐concept encrypted communication achieved UV‐sensitive light‐sensing units. These findings highlight FPPE's potential enhance device control, enabling high‐performance photodetection.

Language: Английский

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Ultra-fast WSe₂ homojunction photodiode with a large linear dynamic range towards in-sensor image processing

Nanoscale Horizons, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A single-gate-tunable bipolar photoresponse photodetector based on a WSe 2 in-plane homojunction is developed towards simultaneous high dynamic range image perception and processing.

Language: Английский

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Wafer‐Scale Fabrication of Broadband Sb₂Se₃ Photodetectors and their Multifunctional Optoelectronic Applications

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 6, 2024

Abstract Low‐dimensional van der Waals materials (vdWMs) have attracted worldwide interest on account of numerous advantages including self‐passivated surface, high carrier mobility, excellent flexibility, etc . Among multiple vdWMs, Sb 2 Se 3 stands out due to its light absorption coefficient, environmentally friendly components, stability, and abundant reserve. However, limited effective wavelength range unscalable preparation been obstinate issues standing in the way further development. Herein, pulsed‐laser deposition (PLD) has developed for synthesizing nanofilms, wafer‐scale realized. The PLD‐derived photodetector demonstrates broadband photoresponse across UV NIR. First‐principles calculations determined that this is because formation vacancies can result a reduction bandgap. Upon 635 nm illumination, an optimal responsivity 2.68 A W −1 achieved, corresponding external quantum efficiency 524% specific detectivity 1.34 × 10 12 Jones. Furthermore, device manifests short response/recovery time ≈2/1 ms. Proof‐of‐concept imaging as well fitness monitoring (respiratory rate & heart rate) Profited from scalable preparation, array photodetectors produced, exhibiting qualified device‐to‐device variation. On whole, study depicted attractive landscape next‐generation integrated optoelectronics.

Language: Английский

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Two-dimensional layered material photodetectors: what could be the upcoming downstream applications beyond prototype devices?

Nanoscale Horizons, Journal Year: 2024, Volume and Issue: 9(10), P. 1599 - 1629

Published: Jan. 1, 2024

The applications of 2D material photodetectors in extensive fields, including imaging, health monitoring, tracking, logic operation, ultraviolet communications, automatic driving, and acoustic signal detection, have been introduced.

Language: Английский

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