ACS Photonics最新文献_第5页

Tunable Photoinduced Liquid Crystal Retarders for All-Optical Diffractive Deep Neural Networks 用于全光学衍射深度神经网络的可调光诱导液晶缓速器

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-05 DOI: 10.1021/acsphotonics.4c0128410.1021/acsphotonics.4c01284

Quanzhou Long, Lisheng Yao, Junjie Shao, Fion Sze Yan Yeung, Lingxiao Zhou, Wanlong Zhang* and Xiaocong Yuan*,

{"title":"Tunable Photoinduced Liquid Crystal Retarders for All-Optical Diffractive Deep Neural Networks","authors":"Quanzhou Long, Lisheng Yao, Junjie Shao, Fion Sze Yan Yeung, Lingxiao Zhou, Wanlong Zhang* and Xiaocong Yuan*, ","doi":"10.1021/acsphotonics.4c0128410.1021/acsphotonics.4c01284","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01284https://doi.org/10.1021/acsphotonics.4c01284","url":null,"abstract":"An all-optical diffractive deep neural network (D2NN) consists of deep-learning-based design of passive diffractive layers and uses light to perform massive computations at the speed of light with zero extra power consumption, exhibiting advantages of large bandwidth, high interconnection, and parallel processing capability. In this paper, we introduce a novel approach utilizing a 5-layer all-optical D2NN constructed with photoinduced liquid crystal (LC) alignment technology to create LC-based tunable phase retarders as artificial neural layers. The D2NN architecture leverages microscale multidomain LC retarders as optical neurons to manipulate the geometric phase of incident light. We systematically simulate pixel-level displacements to enhance alignment tolerance during experiments, achieving robust resilience against misalignment interference with a 2-pixel tolerance in the x and y directions. By actively tuning the LC retarders with external voltage, we optimize the alignment strategy for all network layers, incorporating specially designed concave or convex lenses at each LC retarder for precise alignment in the x, y, and z directions. Through training with a handwritten dataset from MNIST, the D2NN demonstrates a simulated accuracy of 94.17% with a 2 pixel misalignment tolerance. Experimental validation achieves a classification accuracy of 89% with 500 random digits from the test dataset. This research showcases the potential for network miniaturization, integration, and compatibility with visible light, underscoring the practical applicability of an all-optical D2NN for diverse real-world applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 11","pages":"4778–4785 4778–4785"},"PeriodicalIF":6.5,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-Wavelength Exciton-Polariton Condensation via Relaxation of Multiple Vibrational Quanta in Organic Microcavities 通过有机微腔中多个振动量子的弛豫实现双波长激子-极化子凝聚

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-04 DOI: 10.1021/acsphotonics.4c0119510.1021/acsphotonics.4c01195

Liuqing Yang, Xuekai Ma, Teng Long, Han Huang, Jiahuan Ren, Chunling Gu, Cunbin An, Bo Liao, Hongbing Fu* and Qing Liao*,

{"title":"Dual-Wavelength Exciton-Polariton Condensation via Relaxation of Multiple Vibrational Quanta in Organic Microcavities","authors":"Liuqing Yang, Xuekai Ma, Teng Long, Han Huang, Jiahuan Ren, Chunling Gu, Cunbin An, Bo Liao, Hongbing Fu* and Qing Liao*, ","doi":"10.1021/acsphotonics.4c0119510.1021/acsphotonics.4c01195","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01195https://doi.org/10.1021/acsphotonics.4c01195","url":null,"abstract":"The relaxation of organic polaritons is a key aspect for understanding nonequilibrium bosonic condensation in organic microcavities. In this work, dual-branch vibrational quanta-assisted polariton condensation is experimentally observed in organic single-crystal-filled microcavities. By precisely modulating the thickness of the planar optical resonator, we can tune the ground states of two lower polariton branches to perfectly match the energies of two vibrational modes and consequently trigger polariton condensation in both branches. These condensates have nearly identical thresholds. Dynamical analysis indicates that efficient energy relaxation of the photogenerated excitons to the two vibrational modes through the nonradiation of two separately vibrational quanta enables polaritons to populate the ground states of these two lower polariton branches. Our work is evidence of the importance of the vibrational quanta relaxation mechanism for polariton condensation and provides a pathway for multicolor polariton condensation and future laser displays.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 11","pages":"4700–4706 4700–4706"},"PeriodicalIF":6.5,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing Spectral-Hole-Burning in Non-Hermitian Scatterings: Differentiating Far-Field Interference and Near-Field Coupling 探测非ermitian散射中的谱孔燃烧：区分远场干扰和近场耦合

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-03 DOI: 10.1021/acsphotonics.4c0108510.1021/acsphotonics.4c01085

Wen-jie Zhou, Jingfeng Liu, Renming Liu, Juan-feng Zhu, Dmitrii Gromyko, Cheng-wei Qiu* and Lin Wu*,

{"title":"Probing Spectral-Hole-Burning in Non-Hermitian Scatterings: Differentiating Far-Field Interference and Near-Field Coupling","authors":"Wen-jie Zhou, Jingfeng Liu, Renming Liu, Juan-feng Zhu, Dmitrii Gromyko, Cheng-wei Qiu* and Lin Wu*, ","doi":"10.1021/acsphotonics.4c0108510.1021/acsphotonics.4c01085","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01085https://doi.org/10.1021/acsphotonics.4c01085","url":null,"abstract":"Scattering spectra from radiative non-Hermitian systems often exhibit intricate line shapes, where peaks typically garner the most attention for mode identification. However, in multimode systems, the valleys between these peaks may contain valuable information. This “coupling” feature arises from the nonorthogonality of modes in both far and near fields, giving rise to diverse and complex spectra-hole-burning (SHB) patterns. Traditionally, the interpretation of these SHBs has focused on Rabi splitting or Fano resonances, often concentrating solely on either far-field interference or near-field coupling. However, it is essential to recognize that both phenomena coexist in non-Hermitian scatterings. In this study, we develop a quantitative quantum model to probe scattering SHB by simultaneously extracting near-field coupling rates between system quasinormal modes, nonradiative decay rates into a heat reservoir, and radiative decay rates into a vacuum reservoir for far-field interference. We apply our model to illustrate the concept of geometric engineering in tuning the ratio of far-field interference and near-field coupling, exemplified by a silver dimer transitioning from cube-dimer to sphere-dimer or cube-dimer to nanocube-on-mirror configurations. Through this, we establish a universal design guideline for non-Hermitian scattering by creating a two-mode SHB library based on arbitrarily tunable far-field interference and near-field coupling. The developed model serves as a generalized diagnostic tool for probing the SHB mechanisms in all types of non-Hermitian scattering problems, promising to advance our understanding of intricate phenomena and facilitate the design of tailored optical devices with enhanced performance and functionality.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 11","pages":"4671–4681 4671–4681"},"PeriodicalIF":6.5,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Survey on Emerging Trends and Applications of 5G and 6G to Healthcare Environments 5G 和 6G 在医疗环境中的新兴趋势和应用调查

IF 16.6 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-02 DOI: 10.1145/3703154

Shamsher Ullah, Jianqiang Li, Jie Chen, IKRAM ALI, Salabat Khan, Abdul Ahad, Farhan Ullah, Victor Leung

{"title":"A Survey on Emerging Trends and Applications of 5G and 6G to Healthcare Environments","authors":"Shamsher Ullah, Jianqiang Li, Jie Chen, IKRAM ALI, Salabat Khan, Abdul Ahad, Farhan Ullah, Victor Leung","doi":"10.1145/3703154","DOIUrl":"https://doi.org/10.1145/3703154","url":null,"abstract":"A delay, interruption, or failure in the wireless connection has a significant impact on the performance of wirelessly connected medical equipment. Researchers presented the fastest technological innovations and industrial changes to address these problems and improve the applications of information and communication technology. The development of the 6G communication infrastructure was greatly aided by the use of Block-chain technology, artificial intelligence (AI), virtual reality (VR), and the Internet of Things (IoT). In this paper, we comprehensively discuss 6G technologies enhancement, its fundamental architecture, difficulties, and other issues associated with it. In addition, the outcomes of our research help make 6G technology more applicable to real-world medical environments. The most important thing that this study has contributed is an explanation of the path that future research will take and the current state of the art. This study might serve as a jumping-off point for future researchers in the academic world who are interested in investigating the possibilities of 6G technological developments.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"26 1","pages":""},"PeriodicalIF":16.6,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142566124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving Balanced Energy Harvesting and Light Detection via Compositional Modulation with a High-LUMO-Level Nonfused-Ring Electron Acceptor 通过高 LUMO 级非熔环电子受体的成分调制实现平衡的能量收集和光探测功能

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-02 DOI: 10.1021/acsphotonics.4c0123210.1021/acsphotonics.4c01232

Min Soo Kim, Dou Luo, Byung Gi Kim, Woongsik Jang, Chengwei Shan, Aung Ko Ko Kyaw* and Dong Hwan Wang*,

{"title":"Achieving Balanced Energy Harvesting and Light Detection via Compositional Modulation with a High-LUMO-Level Nonfused-Ring Electron Acceptor","authors":"Min Soo Kim, Dou Luo, Byung Gi Kim, Woongsik Jang, Chengwei Shan, Aung Ko Ko Kyaw* and Dong Hwan Wang*, ","doi":"10.1021/acsphotonics.4c0123210.1021/acsphotonics.4c01232","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01232https://doi.org/10.1021/acsphotonics.4c01232","url":null,"abstract":"Organic photovoltaics (OPVs) and organic photodetectors (OPDs) offer promising energy harvesting and photodetection capabilities. In this study, we newly designed and synthesized a novel nonfused-ring electron acceptor (NFREA) named “LK-2” with a high lowest unoccupied molecular orbital (LUMO) level of −3.61 eV. We aimed to enhance the energy harvesting performance in OPVs by improving the open-circuit voltage (VOC) and light detecting ability by mitigating the dark currents in the OPDs. LK-2 was incorporated into the host photoactive material comprising PM6 donors and BTP-4F-12 acceptors using a ternary strategy that facilitated compositional modulation among the materials. The inclusion of LK-2 resulted in an improved VOC of 0.84 V under 1-sun illumination and a significantly suppressed dark current density of 2.77 × 10–10 A cm–2 under a self-powered condition. The effective intermixing of LK-2 with PM6 and BTP-4F-12 facilitated a favorable thin-film morphology, contributing to enhanced device performance. Furthermore, LK-2 suppressed bimolecular recombination under low light intensities and reduced noise currents, resulting in a broad linear dynamic range even under reverse bias conditions. This study highlighted the potential of the newly developed NFREA for simultaneously enhancing the performance of both OPV and OPD devices, offering a balanced approach to realize energy harvesting and light detection.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 11","pages":"4739–4750 4739–4750"},"PeriodicalIF":6.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation Methodologies in Software Protection Research 软件保护研究中的评估方法

IF 16.6 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-02 DOI: 10.1145/3702314

Bjorn De Sutter, Sebastian Schrittwieser, Bart Coppens, Patrick Kochberger

{"title":"Evaluation Methodologies in Software Protection Research","authors":"Bjorn De Sutter, Sebastian Schrittwieser, Bart Coppens, Patrick Kochberger","doi":"10.1145/3702314","DOIUrl":"https://doi.org/10.1145/3702314","url":null,"abstract":"Man-at-the-end (MATE) attackers have full control over the system on which the attacked software runs, and try to break the confidentiality or integrity of assets embedded in the software. Both companies and malware authors want to prevent such attacks. This has driven an arms race between attackers and defenders, resulting in a plethora of different protection and analysis methods. However, it remains difficult to measure the strength of protections because MATE attackers can reach their goals in many different ways and a universally accepted evaluation methodology does not exist. This survey systematically reviews the evaluation methodologies of papers on obfuscation, a major class of protections against MATE attacks. For 571 papers, we collected 113 aspects of their evaluation methodologies, ranging from sample set types and sizes, over sample treatment, to performed measurements. We provide detailed insights into how the academic state of the art evaluates both the protections and analyses thereon. In summary, there is a clear need for better evaluation methodologies. We identify nine challenges for software protection evaluations, which represent threats to the validity, reproducibility, and interpretation of research results in the context of MATE attacks and formulate a number of concrete recommendations for improving the evaluations reported in future research papers.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"7 1","pages":""},"PeriodicalIF":16.6,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142566121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gender Bias in Natural Language Processing and Computer Vision: A Comparative Survey 自然语言处理和计算机视觉中的性别偏见：比较调查

IF 16.6 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-02 DOI: 10.1145/3700438

Marion Bartl, Abhishek Mandal, Susan Leavy, Suzanne Little

引用次数: 0

Enhanced Second-Harmonic Generation in a Monolayer Tungsten Diselenide Integrated Silicon Nitride Nanocavity 单层二硒化钨集成氮化硅纳米腔中的增强型二次谐波发生

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-02 DOI: 10.1021/acsphotonics.4c0102910.1021/acsphotonics.4c01029

Hannah Rarick, Abhinav Kala, Sinabu Pumulo, Arnab Manna, David Sharp, Christopher Munley, Xiaodong Xu and Arka Majumdar*,

{"title":"Enhanced Second-Harmonic Generation in a Monolayer Tungsten Diselenide Integrated Silicon Nitride Nanocavity","authors":"Hannah Rarick, Abhinav Kala, Sinabu Pumulo, Arnab Manna, David Sharp, Christopher Munley, Xiaodong Xu and Arka Majumdar*, ","doi":"10.1021/acsphotonics.4c0102910.1021/acsphotonics.4c01029","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01029https://doi.org/10.1021/acsphotonics.4c01029","url":null,"abstract":"Observations of nonlinear optical phenomena are greatly hindered by the large optical power requirements. Nanophotonic cavities can drastically reduce the required optical powers thanks to the strong spatial and temporal confinement of light. Furthermore, two-dimensional atomically thin transition metal dichalcogenides boast high nonlinear optical coefficients and are promising candidates for hybrid nanophotonics due to their ease of integration and compatibility with many substrates without requiring explicit lattice matching. Here, we demonstrate cavity enhanced second harmonic generation in a monolayer tungsten diselenide integrated silicon nitride nanocavity. With a fundamental frequency close to the excitonic resonance and a large second order susceptibility at wavelengths near 800 nm, we observed a cavity enhancement of more than 3 orders of magnitude of second harmonic generation compared to bare monolayer.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 11","pages":"4635–4641 4635–4641"},"PeriodicalIF":6.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fog Computing Technology Research: A Retrospective Overview and Bibliometric Analysis 雾计算技术研究：回顾性概述和文献计量分析

IF 16.6 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-02 DOI: 10.1145/3702313

Paola Vinueza-Naranjo, Janneth Chicaiza, Ruben Rumipamba-Zambrano

引用次数: 0

Metasurface-Based Spatial Hilbert Transformer on an SOI Platform 基于 SOI 平台的元表面空间希尔伯特变换器

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-01 DOI: 10.1021/acsphotonics.4c0135510.1021/acsphotonics.4c01355

Yuhan Ma, Qiaoling Zhou, Shaonan Zheng, Yuan Dong, Yang Qiu, Xingyan Zhao, Ping Yu, Qize Zhong* and Ting Hu*,

{"title":"Metasurface-Based Spatial Hilbert Transformer on an SOI Platform","authors":"Yuhan Ma, Qiaoling Zhou, Shaonan Zheng, Yuan Dong, Yang Qiu, Xingyan Zhao, Ping Yu, Qize Zhong* and Ting Hu*, ","doi":"10.1021/acsphotonics.4c0135510.1021/acsphotonics.4c01355","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01355https://doi.org/10.1021/acsphotonics.4c01355","url":null,"abstract":"The Hilbert transform operation in the optical domain plays an important role in optical signal processing and computing. Optical Hilbert transformers based on conventional lenses in free space face limitations such as bulky sizes, complicated structures, and alignment errors. Metasurfaces composed of nanoscale meta-atoms are able to precisely control the optical wavefront on a subwavelength scale, providing an alternative solution of functional optical components with compact sizes. Here, we propose and experimentally demonstrate an in-plane metasurface-based spatial Hilbert transformer that can overcome the aforementioned limitations in conventional optical Hilbert transformers. The device consists of three cascaded in-plane metasurfaces based on an optical 4f system, wherein two identical metalenses serve as Fourier transformers, and the other one serves as the convolution kernel inserted between the metalenses. The fabricated device performs an accurate Hilbert transform on the input signal and achieves a coefficient of determination (R2) of 0.94 between the theoretical and experimental results. This work provides a potential approach for realizing high-performance optical analog computation with in-plane metasurfaces on a silicon-on-insulator platform.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 11","pages":"4830–4837 4830–4837"},"PeriodicalIF":6.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0