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Liquid crystal between two distributed Bragg reflectors enables multispectral small-pitch spatial light modulator

Light(Science & Applications) 2022年第8期11卷 1643-1645页

作者： Junghyun Park Kanghee Won Young Kim Advanced Sensor Lab Device Research CenterSamsung Advanced Institute of TechnologySuwonRepublic of Korea

The ability of controlling the phase of light at the subwavelength scale can be a game-changer due to its extraordinally wide angle-range in the wavefront shaping. By combining two conventional material and configurat... 详细信息

关键词： crystal enable light

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Novel medium entropy perovskite oxide Sr(FeCoNiMo)_(1/4)O_(3−δ)for zinc-air battery cathode

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Journal of Energy Chemistry 2024年第9期96卷 669-678页

作者： Kaixin Li Juntao Gao Xu Han Qi Shao Zhe Lü School of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Components Harbin 150001HeilongjiangChina

It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxides often involves introducing multiple elements with different properties,thereby providing outstanding bifunctional catalytic activity for OER/***,the possible underlying catalytic pathways and potential interactions between various components are still poorly *** paper presents an excellent medium-entropy perovskite oxide,Sr(FeCoNiMo)_(1/4)O_(3−δ)(lower overpotential of 301 mV at 10 mA cm^(−2)).Zinc-air batteries employing it as a cathode catalyst demonstrate excellent round-trip efficiency(62%).By combining theoretical calculation with experiments,we aim to establish the link between the electronic structure of perovskite oxides with different elemental compositions and their OER *** reveals that the conformational entropy strategy can simultaneously shift the O 2p-band center and metal d-band center of perovskite oxide towards the vicinity of the Fermi energy level,thereby triggering a more favorable lattice oxygen-participated mechanism(LOM)during the OER *** outcomes of this work provide crucial insights into the role of conformational entropy strategies in oxygen catalysis and offer potential avenues for constructing efficient and stable electrocatalysts.

关键词： Sr(FeCoNiMo)_(1/4)O_(3−δ) Bifunctional catalyst Medium entropy LOM Rechargeable zinc-air batteries

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Polyvinylidene Difluoride/Sb2S3 Composite Film as a Potential Candidate for Piezoelectric Energy Generation

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Journal of The Institution of Engineers (India): Series D 2024年第1期105卷 147-153页

作者： Baral, Apurba Mukherjee, Nillohit School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur Botanic Garden West Bengal Howrah711103 India

In this work, antimony sulphide (Sb2S3) in powder form was prepared using a simple chemical bath deposition technique by taking potassium antimonyl tartrate hemihydrate (K(SbO)C4H4O6), 0.5H2O) and sodium thiosulphate pentahydrate (Na2S2O3, 5H2O) as the source of Sb and S, respectively. The polymer, polyvinylidene difluoride (PVDF) was then impregnated by this chemically prepared Sb2S3 with varying wt% and PVDF/Sb2S3 composites were prepared in the form of films using solution casting method. Detailed structural/compositional characterization was carried out through x-ray diffraction, differential scanning calorimetry, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and atomic force microscopy techniques with the synthesized materials. The PVDF/Sb2S3 composite films were also subjected to thorough electrical characterization that revealed excellent piezoelectric attributes. The voltage, current density and power output obtained from this composite film were highly impressive (~ 90 V, ~ 19 µA/cm2 and ~ 19,400 W/m3 across 1 MΩ load, respectively) making it worthy to use as a clean energy generator. The device was also utilized to charge a 2.2 µF-63 V capacitor up to ~ 40 V with simple finger patting. The results open up the avenue for utilizing this PVDF/Sb2S3 composite film in real life application as a clean energy generator. © The Institution of Engineers (India) 2023.

关键词： Sulfur compounds

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Polyvinyl chloride-reduced graphene oxide based chemiresistive sensor for sensitive detection of ammonia

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Journal of Materials Science: Materials in Electronics 2024年第3期35卷 1-18页

作者： Gaikwad, Sumita S. More, Mayuri S. Khune, Abhaysinh S. Mohammed, Hamed Y. Tsai, Meng-Lin Hianik, Tibor Shirsat, Mahendra D. RUSA Centre for Advanced Sensor Technology Department of Physics Dr Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava842 48 Slovakia

In this study, we present the innovative development of sensitive chemiresistive sensor utilizing a composite material composed of polyvinyl chloride (PVC) and reduced graphene oxide (rGO) for the highly responsive detection of ammonia (NH3) at ambient conditions. Graphene oxide (GO) was meticulously synthesized employing an enhanced version of Hummer’s method, and subsequently, rGO was prepared via thermal reduction from GO. The PVC/rGO composite was synthesized using a precise chemical pathway. The synthesized material was comprehensively characterized using advanced techniques including X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy, Raman spectroscopy, atomic force microscopy (AFM), and I–V measurements, unveiling its structural, spectroscopic, morphological, and electrical attributes. The chemiresistive sensor was fabricated through the meticulous drop-casting of PVC/rGO composite onto an economical Cu interdigitated electrode (IDE) pattern. Remarkably, this PVC/rGO-based chemiresistive sensor exhibited superior performance in detecting corrosive NH3. The sensor demonstrated an exceptional response time of 46 s and a recovery time of 88 s, coupled with an impressively low detection limit of 1 ppm, surpassing the Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL). Notably, this sensor displayed a remarkable selectivity towards NH3 at ambient conditions, outperforming its response to other gases. Furthermore, the sensor exhibited outstanding reproducibility, repeatability, linearity, sensitivity, and stability in its response to NH3. This research showcases a groundbreaking advancement in the field of gas sensing technology, offering a highly sensitive and selective chemiresistive sensor for NH3 detection at room temperature (RT). The synergistic combination of PVC and rGO in the composite material, along with the precise fabrication techniques employed, has resulted in a sensor with u

关键词： Ammonia

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Design and Simulation of a PV System with Battery Storage Using Bifacial Halfcut Module 8

Design and Simulation of a PV System with Battery Storage Us...

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8th International Conference on Electronics, Materials Engineering and Nano-technology, IEMENTech 2025

作者： Bala, Sourav Sarkar, Sudipta Maity, Santanu Mukhopadhyay, Sumita School of Advanced Materials Indian Institute of Engineering Science and Technology Green Energy and Sensor Systems Howrah Shibpur India

ISBN: (纸本)9798331520762

In the absence of conventional energy sources renewable energy is the only suitable option left. Multiple renewable energy sources like Hydroelectric Energy, Tidal Energy, Geothermal Energy, and Solar Electrical Energy are becoming popular every day. There are multiple reasons such as its availability in small to large sizes, predictability, easy installation, smooth maintenance process, drop in system installation cost, and mostly fast return on investment. With the increase in demand for solar photovoltaic panels, the demand for producing higher power output from less area is increasing rapidly. Hence with every breakthrough, the efficiency of the Photovoltaic Panel is increasing rapidly. With continuous development, the PV modules are developed in such a way that light can be absorbed from the front and rear on both sides. In the Bi-facial module, the direct sunlight gets absorbed from the front, and the albedo is also absorbed from the back to increase the power generation further. With the implementation of half-cut technology, the shading losses are minimized further. Rapid development is also being done on MPPT and Inverter to improve efficiency. Presently a generalized mathematical model for bifacial half-cut module is not published in any literature. In this paper, the research gap is covered by designing a Bifacial Half-cut PV Module along with an MPPT and also a bidirectional DC-DC Converter for charging and discharging of Battery Bank. Finally, we have integrated the system and also have simulated the designed system to check its stability. Such a model helps in analyzing and validating performance characteristics of commercially available bifacial modules and half-cut modules. © 2025 IEEE.

关键词： Tidal power

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Cross-Modal Graph Semantic Communication Assisted by Generative AI in the Metaverse for 6G

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Research 2024年第2期2024卷 19-27页

作者： Mingkai Chen Minghao Liu Congyan Wang Xingnuo Song Zhe Zhang Yannan Xie Lei Wang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsNanjng 210003China State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM) Nanjing University of Posts and TelecommunicationsNanjing 210023China

Recently, the development of the Metaverse has become a frontier spotlight, which is an important demonstration of the integration innovation of advanced technologies in the Internet. Moreover, artificial intelligence (AI) and 6G communications will be widely used in our daily lives. However, the effective interactions with the representations of multimodal data among users via 6G communications is the main challenge in the Metaverse. In this work, we introduce an intelligent cross-modal graph semantic communication approach based on generative AI and 3-dimensional (3D) point clouds to improve the diversity of multimodal representations in the Metaverse. Using a graph neural network, multimodal data can be recorded by key semantic features related to the real scenarios. Then, we compress the semantic features using a graph transformer encoder at the transmitter, which can extract the semantic representations through the cross-modal attention mechanisms. Next, we leverage a graph semantic validation mechanism to guarantee the exactness of the overall data at the receiver. Furthermore, we adopt generative AI to regenerate multimodal data in virtual scenarios. Simultaneously, a novel 3D generative reconstruction network is constructed from the 3D point clouds, which can transfer the data from images to 3D models, and we infer the multimodal data into the 3D models to increase realism in virtual scenarios. Finally, the experiment results demonstrate that cross-modal graph semantic communication, assisted by generative AI, has substantial potential for enhancing user interactions in the 6G communications and Metaverse.

关键词： modal frontier guarantee

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Real-Time LIDAR Imaging by Solid-State Single Chip Beam Scanner

Real-Time LIDAR Imaging by Solid-State Single Chip Beam Scan...

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IS and T International Symposium on Electronic Imaging: Autonomous Vehicles and Machines, AVM 2022

作者： Lee, Jisan Son, Kyunghyun Lee, Changbum Hwang, Inoh Jang, Bongyong Lee, Eun Kyung Shim, Dongshik Byun, Hyunil Shin, Changgyun Tatsuhiro, Otsuka Cho, YongChul Ha, Kyoungho Choo, Hyuck Advanced Sensor Lab. Samsung Advanced Institute of Technology Samsung Electronics Korea Republic of

We present a real-time light detection and ranging (LIDAR) imaging by developing a single-chip solid-state beam scanner. The beam scanner is integrated with a fully functional 32-channel optical phased array, 36 optical amplifiers, and a tunable laser at central wavelength ~1310 nm, all on a 7.5 × 3 mm2 single chip fabricated with III-V on silicon processes. The phased array is calibrated with self-evolving genetic algorithm to enable beam forming and steering in two dimensions. Distance measurement is performed with a digital signal processing that measures the time of flight (TOF) of pulsed light with a system consisting of an avalanche photodiode (APD), trans-impedance amplifier (TIA), analog-digital converter (ADC), and a processor. The LIDAR module utilizing this system can acquire point cloud images with 120 × 20 resolution with a speed of 20 frames per seconds at a distance up to 20 meters. This work presents the first demonstration of a chip-scale LIDAR solution without any moving part or bulk external light source or amplifier, making an ultra-low cost and compact LIDAR technology a reality. © 2022, Society for Imaging Science and technology.

关键词： Light sources

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Electrochemically Deposited Cu(II)/Cu(I) Oxide Heterostructure as Highly Sensitive Platform for Electrochemical Detection of Glucose and Methanol

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1361-1371页

作者： Mondal, Rimpa Ahmed, Sk. Faruque Mukherjee, Nillohit Department of Physics Aliah University West Bengal Newtown Kolkata700156 India School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur West Bengal Howrah711103 India

Detection of glucose level and in human body is very essential in many ways. Besides glucose, methanol also plays crucial role in human physiology as it can influence human nervous system. So, detection of any imbalance in methanol level is also crucial. For this purpose, in this work, CuO/Cu2O bulk heterostructures were electrochemically deposited in the form of thin films on ITO-coated glass substrates using cyclic voltammetry and amperometrically. The deposited films were characterized using X-ray diffraction technique (XRD), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and UV–Vis spectroscopy. The electrochemical attributes of the deposited films towards glucose and methanol sensing were studied through cyclic voltammetry (CV), amperometric i-t and electrochemical impedance spectroscopy (EIS). From the linear fit plot, the sensitivity was found to be 237.7 µA µM−1 cm−2 with LoD (limit of detection) of 19.8 µM and up to 1.2 mM concentration of glucose. Further, for methanol, both LoD and sensitivity values were found to be 0.007 µM and 0.016 µA/µ***2, respectively. The results are quite promising for the deposited material for its possible real-life applications as sensing platform for the electrochemical D-glucose and methanol detections. © The Institution of Engineers (India) 2024.

关键词： Copper oxides

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Terahertz polarization modulator based on chiral metasurface integrated with vanadium dioxide

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Optics Letters 2025年第10期50卷 3345-3348页

作者： Luo, Li Zhou, Ling Zou, Yuxin Yang, Jiaqi Huo, Jiahui Yang, Xu Lv, Yuanyuan Bian, Jingjing Peng, Sui Liu, Bo Pan, Yudong He, Jin Li, Jie Yao, Jianquan Sichuan Province Key Laboratory of Optoelectronic Sensor Devices and Systems College of Optoelectronic Engineering Chengdu IC Valley Industrial College Chengdu University of Information Technology Chengdu610225 China Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu University of Information Technology Chengdu610225 China Chengdu Advanced Metal Materials Industry Technology Research Institute Limited Company Chengdu610300 China School of Precision Instruments and Opto-Electronics Engineering Tianjin University Tianjin300072 China

Conventional optical polarization modulation depends on block birefringent devices, and currently there are still no commercial polarization modulation devices available for terahertz beams in free space. Metasurfaces present more opportunities for the manipulation of optical and terahertz waves, which are advantageous for highly efficient polarization modulation devices. In this paper, what we believe to be a new chiral metasurface for the polarization modulation of reflected terahertz waves is proposed that consists of vanadium dioxide (VO2) combined with metal patterns for active chiral meta-atoms. Through electric stimulation, dynamic modulation of the polarization state can be achieved. The results indicate that the metasurface shows a strong circular dichroism at an operating frequency of 0.192 THz. In the insulating state, the absorption of the right-circularly polarized (RCP) wave is significantly higher than that of the left-circularly polarized (LCP) wave. By adjusting the transition state of VO2, the chirality of the structure is reduced, enabling the reflected wave to be switched from a circularly polarized state to a linearly polarized one. The absorption and polarization of terahertz wave can also be controlled by the incident angle. This method is anticipated to promote the development of terahertz communication and imaging technologies. © 2025 Optica Publishing Group. All rights are reserved.

关键词： Circular polarization

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Palm-sized LiDAR module with III/V-on-Si optical phased array

Palm-sized LiDAR module with III/V-on-Si optical phased arra...

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2022 IEEE Symposium on VLSI technology and Circuits, VLSI technology and Circuits 2022

作者： Son, Kyunghyun Shin, Dongjae Lee, Jisan Jang, Bongyong Shim, Dongsik Byun, Hyunil Lee, Changbum Cho, Yongchul Otsuka, Tatsuhiro Shin, Changgyun Hwang, Inoh Lee, Eun Kyung Ha, Kyoungho Choo, Hyuck Samsung Advanced Institute of Technology Samsung Electronics Advanced Sensor Lab. Suwon Korea Republic of

ISBN: (纸本)9781665497725

We have implemented a compact, highly accurate light detection and ranging (LiDAR) module using our III/V-on-Si optical phased array (OPA). Our module measures only 1.4 liter in volume, and we demonstrated 20-m ranging and 10-m 3D imaging with 1-cm accuracy under 100-klx bright sunlight. The accuracy was improved by 300% from our previous work [1] by employing sub-binning-based digital signal processing (DSP). The small size and its robust 3D depth-sensing performance promise strong commercial viability. © 2022 IEEE.

关键词： Digital signal processing

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