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2023 International Topical Meeting on Microwave Photonics, MWP 2023

作者： Wei, Chao Chen, Yake Sun, Yang Zeng, Zhongming Ye, Jia Zou, Xihua Pan, Wei Xie, Xiaojun Yan, Lianshan Southwest Jiaotong University Key Laboratory of Photonic-Electric Integration and Communication-Sensing Convergence School of Information Science and Technology Chengdu China Chinese Academy of Sciences Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-Bionics Suzhou China

ISBN: (纸本)9798350342215

The study presents a demonstration of InP/InGaAs modified uni-Traveling carrier (MUTC) photodiode (PD) arrays heterogeneously integrated on the thin-film lithium niobate platform. To divide the input optical power evenly, a 1×N multimode interferometer (MMI) is employed to feed the PDs through N waveguides. The PD arrays, consisting of 2, 3, and 4 PDs, exhibit 3-dB bandwidths of 82 GHz, 67 GHz, and 62 GHz, respectively. The measured output power of the 1 ×4 PD array reaches-2.3 dBm at 30 GHz. © 2023 IEEE.

关键词： Thin films

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Compact Optical 90° Hybrid based on a Wedge-shaped 2 × 4 MMI Coupler and a 2 × 2 MMI Coupler on Thin-film Lithium Niobate Platform

Compact Optical 90° Hybrid based on a Wedge-shaped 2 × 4 M...

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2023 International Topical Meeting on Microwave Photonics, MWP 2023

作者： Chen, Yake Sun, Yang Zeng, Zhongming Ye, Jia Zou, Xihua Pan, Wei Xie, Xiaojun Yan, Lianshan Southwest Jiaotong University Key Laboratory of Photonic-Electric Integration and Communication-Sensing Convergence School of Information Science and Technology Chengdu China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou China

ISBN: (纸本)9798350342215

We conducted an experimental demonstration of a wedge-shaped optical 90-degree hybrid coupler on the thin film lithium niobate (TFLN) platform, utilizing a paired-interference-based 2 × 4 multimode interference (MMI) coupler and a general-interference-based 2 × 2 MMI coupler. The fabricated optical 90-degree hybrid coupler has a compact footprint with a length of 134 μm. In a coherent receiving system, the demonstrated hybrid coupler directly connects to the balanced photodiode array without waveguide crossing or cascaded phase shifters. The device exhibits an excess loss of less than 1.1 dB and a phase deviation of less than ±5 degree over a spectral range of 1530nm-1560nm, which is promising to enable a compact heterogeneously integrated coherent receiving system on the thin film lithium niobate platform. © 2023 IEEE.

关键词： Thin films

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Optical fiber-based surface plasmon resonance sensor for simultaneous measurement of relative humidity and temperature

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Applied Optics 2025年第9期64卷 2261-2268页

作者： Zhang, Qi Chen, Xiaopeng Li, Xinghui Wang, Huifang Zhou, Xue Yan, Xin Cheng, Tonglei State Key Laboratory of Synthetical Automation for Process Industries College of Information Science and Engineering National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern University Shenyang110819 China Department of Mechanical Engineering Politecnico di Milano Milan20156 Italy Foshan Graduate School of Innovation Northeastern University Guangdong Foshan528311 China Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology Qinhuangdao066004 China

In this work, an optical fiber sensor based on surface plasmon resonance (SPR) is proposed for simultaneous measurement of relative humidity (RH) and temperature, which is constructed by connecting two segments of thin-core fibers (TCFs) using a multimode fiber (MMF). The gold film was coated on TCFs to excite the SPR effect. One was further coated with carboxymethyl cellulose (CMC) to sense RH (Channel I), and the other was coated with gold nanoparticles (AuNPs) and polydimethylsiloxane (PDMS) to sense temperature (Channel II). The detection was performed via the resonance wavelength shift induced by the refractive index (RI) change of CMC and PDMS in relation to RH variation and temperature variation, respectively. The incorporation of gold nanoparticles enhances the sensitivity of the SPR sensor and shifts the resonance wavelengths, allowing for more outstanding demarcation of the SPR dip between the two portions inside the equivalent spectrum. Experimental results show that the sensor has an RH sensitivity of −1.053 nm/%RH and a temperature sensitivity of −2.306 nm/◦C. Moreover, the cross-sensitivity issue present in RH and temperature measurements was resolved by introducing a dual-wavelength matrix method. The proposed sensor offers high sensitivity, a simple structure, and ease of manufacturing, making it broadly applicable in fields such as food safety, biotechnology, and manufacturing. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Gold nanoparticles

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Improvement of corrosion resistance and heat dissipation of Mg-6%Al-4%Ca alloy by the addition of Mn, Mm, and the surface treatment

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Keikinzoku/Journal of Japan Institute of Light Metals 2023年第12期73卷 646-650页

作者： Ito, Mizuki Kondo, Natsuki Kirimoto, Yuichi Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama Toyama-shi Japan Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama Toyama Toyama-shi Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama Toyama-shi Japan CHUETSU METAL WORKS CO LTD.. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Toyama Imizu-shi Japan

With the recent digitization, electronic equipment housings are required to be thin-walled and have rigidity, heat dissipation, corrosion resistance, and electromagnetic shielding properties. Magnesium alloys are promising materials that satisfy these requirements. Mg-Al alloys have good castability and high strength, but their thermal conductivity decreases. In general, adding alloying elements to magnesium decreases thermal conductivity the effect of aluminum addition is significant. It was found that adding calcium to Mg-Al alloys to form Mg-Al-Ca (AX) alloys results in higher thermal conductivity than that of Mg-Al alloys. However, AX alloys have poor corrosion resistance and require post-treatment such as surface treatment. In this study, AX64, which has high thermal conductivity among the AX series alloys, was used as the basic composition, and corrosion resistance was improved by adding manganese and misch metal, and an attempt was made to improve corrosion resistance and emissivity through surface treatment. The change in thermal conductivity by heat treatment was also investigated. Experimental results showed that the addition of manganese and misch metal improved corrosion resistance and thermal conductivity. Plasma anodization also improved corrosion resistance and emissivity. Heat treatment of these alloys at 400°C improved the thermal conductivity with longer holding time. © 2023 The Japan Institute of Light Metals.

关键词： Corrosion resistance

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Hands-Free Presentation Tool with Co-speech Gesture Interactions: A Wizard-of-Oz Study

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Human-centric Computing and Information sciences 2023年 13卷

作者： Shin, Ki-Young Lee, Jong-Hyeok Park, Kyudong Department of Convergence IT Engineering Pohang University of Science and Technology Pohang Korea Republic of Graduate School of Artificial Intelligence Pohang University of Science and Technology Pohang Korea Republic of School of Information Convergence Kwangwoon University Seoul Korea Republic of

Despite active research on the design of presentation tools after the emergence of slideshow presentations, there is a lack of research findings on appropriate modalities of interactions for controlling slides in an exploratory manner. The objective of this study is to find the appropriate modality for features of controlling slides and to design usable features. This study used an iterative design process based on the Wizard-of-Oz (WoZ) prototype and participatory design (PD), which was divided into three phases. In the first phase, the participants were directly involved in the ideation process, and they created an initial design set. In the second phase, the initial prototype was evaluated by the participants with WoZ, focusing on the scope of co-speech gesture interactions. Finally, the usability of the final design set was evaluated, and it was demonstrated that the proposed design features were usable in terms of naturalness, controllability, efficiency of information delivery, and efficiency of resource use. The results also showed that verbal modality was more dominant, while many previous studies focused on creating gesture-based systems. This research is expected to provide guidance for designing a handfree presentation with a co-speech gesture, and benefits for conducting PD research with WoZ. © This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://***/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

关键词： Efficiency

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Building an optics and photonics research ecosystem in South Korea:Collaborative innovation between academia and industry

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Light(science & Applications) 2023年第12期12卷 2554-2557页

作者： Younghwan Yang Trevon Badloe Duheon Song Seongjin Park Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Graduate School of Artificial Intelligence Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Samsung Advanced Institute of Technology(SAIT) Suwon 16678Republic of Korea Pohang Iron and Steel Company(POSCO) Pohang 37859Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea Present address:School of System Semiconductor Engineering Yonsei UniversitySeoul 03722Republic of Korea

Photonics research is a rapidly growing field that has found applications in various aspects of our lives,ran-ging from communication to medical ***-laborative innovation between academia and industry has been a driving force behind the significant advances in photonics research in South *** this special issue,we present cutting-edge research in photonics,highlighting the importance of collaboration between academia and industry(Fig.1).

关键词： optics driving photonics

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Singular topological edge states in locally resonant metamaterials

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science Bulletin 2025年第7期70卷 1080-1086页

作者： Yeongtae Jang Seokwoo Kim Eunho Kim Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Division of Mechanical System Engineering Jeonbuk National UniversityJeonju 54896Republic of Korea Graduate School of Mechanical-Aerospace-Electric Convergence Engineering Jeonbuk National UniversityJeonju 54896Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea

Band topology has emerged as a novel tool for material design across various domains,including photonic and phononic systems,and metamaterials.A prominent model for band topology is the Su-Schri effer-Heeger(SSH)chain,which reveals topological in-gap states within Bragg-type gaps(BG)formed by periodic *** from classical BGs,another mechanism for bandgap formation in metamaterials involves strong coupling between local resonances and propagating waves,resulting in a local resonance-induced bandgap(LRG).Previous studies have shown the challenge of topological edge state emergence within the ***,we reveal that topological edge states can emerge within an LRG by achieving both topological phase and bandgap transitions *** describe this using a model of inversion-symmetric extended SSH chains for locally resonant ***,this topological state can lead to highly localized modes,comparable to a subwavelength unit cell,when it emerges within the *** experimentally demonstrate distinct differences in topologically protected modesDhighlighted by wave localizationDbetween the BG and the LRG using locally resonant granulebased *** findings suggest the scope of topological metamaterials may be extended via their bandgap nature.

关键词： Band topology Metamaterials Singular topological edge states Local resonance Woodpile metamaterials

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Julolidine functionalized benzimidazoline-doped fullerene derivatives for efficient and stable perovskite solar cells

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Interdisciplinary Materials 2024年第3期3卷 369-379页

作者： Yanqing Zhu Chenglong Li JiaHui Chen Yuxi Zhang Jianfeng Lu Min Hu Wangnan Li Fuzhi Huang Yi-Bing Cheng Hyesung Park Shengqiang Xiao State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhanChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina School of Electronic and Electrical Engineering Hubei Province Engineering Research Centre for Intelligent Micro-Nano Medical Equipment and Key TechnologiesWuhan Textile UniversityWuhanChina Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices Hubei University of Arts and ScienceXiangyangHubeiChina KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulRepublic of Korea Department of Integrative Energy Engineering Korea UniversitySeoulRepublic of Korea Hubei Key Laboratory of Fuel Cell WuhanChina

Fullerene derivatives are highly attractive materials in solar cells,organic thermoelectrics,and other ***,the intrinsic low electron mobility and electrical conductivity restrict their potential device performance,such as perovskite solar cells(PSCs).Herein,we successfully enhanced the electric properties and morphology of phenyl-C61-butyric acid methyl ester(PCBM)by n-doping it with a benzimidazoline derivative,9-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)-julolidine(JLBI-H)via a solution *** found the n-doping can not only improve the conductivity and optimize the band alignment but also enable the PCBM to have a constantly strong charge extraction ability in a wide temperature from 173 to 373 K,which guarantees a stable photovoltaic performance of the corresponding PSCs under a wide range of operating *** the JLBI-H-doped PCBM,we improved the efficiency from 17.9%to 19.8%,along with enhanced stability of the nonencapsulated devices following the aging protocol of ISOS-D-1.

关键词： charge extraction electron mobility n-doping PSCs wide operation temperature

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Arbitrarily structured quantum emission with a multifunctional metalens

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eLight 2023年第1期3卷 75-84页

作者： Chi Li Jaehyuck Jang Trevon Badloe Tieshan Yang Joohoon Kim Jaekyung Kim Minh Nguyen Stefan A.Maier Junsuk Rho Haoran Ren Igor Aharonovich School of Mathematical and Physical Sciences University of Technology SydneyUltimoNSW 2007Australia School of Physics and Astronomy Monash UniversityMelbourneVIC 3800Australia Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Graduate School of Artificial Intelligence Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Physics Imperial College LondonLondon SW72AZUK POSCO-POSTECH-RIST Convergence Research Centre for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea ARC Centre of Excellence for Transformative Meta-Optical Systems University of Technology SydneyUltimoNSW 2007Australia

Structuring light emission from single-photon emitters(SPEs)in multiple degrees of freedom is of great importance for quantum information processing towards higher ***,traditional control of emission from quantum light sources relies on the use of multiple bulky optical elements or nanostructured resonators with limited functionalities,constraining the potential of multi-dimensional *** we introduce the use of an ultrathin polarisation-beam-splitting metalens for the arbitrary structuring of quantum emission at room *** to the complete and independent polarisation and phase control at the single meta-atom level,the designed metalens enables simultaneous mapping of quantum emission from ultra-bright defects in hexagonal boron nitride and imprinting of an arbitrary wavefront onto orthogonal polarisation states of the *** hybrid quantum metalens enables simultaneous manipulation of multiple degrees of freedom of a quantum light source,including directionality,polarisation,and orbital angular *** could unleash the full potential of solid-state SPEs for their use as high-dimensional quantum sources for advanced quantum photonic applications.

关键词： temperature quantum arbitrary

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Transferrin-Mediated nanophotosensitizer to Enhance Phototherapy with Photoacoustic Imaging Under Hypoxia

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CCS Chemistry 2025年第4期7卷 1127-1141页

作者： Mengyao Yang Yunyoung Nah Donghyeon Oh Xingshu Li Heejeong Kim Sinyoung Park Junha Lim Aibing Chen Chulhong Kim Won Jong Kim Juyoung Yoon College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang 050018 Department of Chemistry and Nanoscience Ewha Womans UniversitySeoul 03760 Department of Chemistry POSTECH-Catholic Biomedical Engineering InstitutePOSTECHPohang 37673 Department of Electrical Engineering Convergence IT EngineeringMechanical Engineeringand Medical Science and EngineeringMedical Device Innovation CenterPOSTECHPohang 37673 Fujian Provincial Key Laboratory of Cancer Metastasis Chemoprevention and Chemotherapy College of ChemistryFuzhou UniversityFuzhou 350108 School of Interdisciplinary Bioscience and Bioengineering POSTECHPohang 37673 Graduate Program in Innovative Biomaterials Convergence Ewha Womans UniversitySeoul 03760

Various obstacles[poor tissue penetration,hypoxic tumor microenvironment,and reactive oxygen species(ROS)production quenching due to aggregation]obstruct imaging-guided high-efficiency phototherapy targeting ***,nanophthalocyanine(ZnPcN4-TF)is elaborately designed based on a synthetic phthalocyanine derivative(ZnPcN4)and nonimmunogenic transferrin(TF)through multiple noncovalent interactions for photoacoustic(PA)imaging-guided *** conjugating electron-rich amino groups effectively suppressed fluorescence and ROS generation due to the strong photoinduced electron transfer effect,ZnPcN4 became an ideal photothermal and PA imaging ***4-TF not only effectively targeted tumor sites and accumulated there,but also,surprisingly,facilitated the enhancement of ROS production via a type I process in an aggregate compared to ZnPcN4 itself,potentially due to accelerated electron ***,ZnPcN4-TF had a substantially more powerful photothermal effect than ZnPcN4 ***,this design effectively overcomes the obstacles to photodynamic therapy(aggregation-related ROS generation quenching in a hypoxic environment).Furthermore,PA imaging solves the tissue penetration challenge in optical *** study provides a broader base for designing novel photosensitizers to improve phototherapy under hypoxia.

关键词： photoacoustic imaging type I reactive oxygen species photothermal effect tumor accumulation self-assembly

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