ACS Photonics最新文献_第9页

Theoretical Description of Infrared Near-Field Spectroscopy of In- and Out-of-Plane Molecular Vibrations in Thin Layers. 薄层分子面内外振动的红外近场光谱理论描述。

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-27 eCollection Date: 2025-07-16 DOI: 10.1021/acsphotonics.5c00798

Isabel Pascual Robledo, Carlos Maciel-Escudero, Martin Schnell, Lars Mester, Javier Aizpurua, Rainer Hillenbrand

{"title":"Theoretical Description of Infrared Near-Field Spectroscopy of In- and Out-of-Plane Molecular Vibrations in Thin Layers.","authors":"Isabel Pascual Robledo, Carlos Maciel-Escudero, Martin Schnell, Lars Mester, Javier Aizpurua, Rainer Hillenbrand","doi":"10.1021/acsphotonics.5c00798","DOIUrl":"10.1021/acsphotonics.5c00798","url":null,"abstract":"Infrared nanospectroscopy, based on scattering-type scanning near-field optical microscopy (s-SNOM), allows for chemical nanoidentification of organic composite layers by local probing of their molecular vibrations. However, the conditions for probing in-plane and out-of-plane molecular vibrations by this technique remain largely unexplored. Here, we perform a systematic theoretical study of the local infrared near-field response of isotropic and anisotropic thin layers using electrostatic numerical calculations, complemented by analytical electrodynamic point-dipole model calculations. Specifically, we study uniaxial thin layers exhibiting molecular vibrations with different orientations on highly and weakly reflecting substrates. We find that both in-plane and out-of-plane molecular vibrations can be probed, with the sensitivity to in-plane vibrations being reduced in samples where the near fields are vertically oriented, such as in thin layers on highly reflecting substrates. We finally show that fast calculations of near-field spectra of uniaxial thin layers can be done with a perturbative finite-dipole model, achieving reasonable quantitative accuracy compared to electrostatic numerical results.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 7","pages":"3782-3793"},"PeriodicalIF":6.5,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12272971/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144673315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Attoliter Mie Void Sensing atoliter Mie虚空传感

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-25 DOI: 10.1021/acsphotonics.5c01198

Serkan Arslan, Micha Kappel, Adrià Canós Valero, Thi Thu Huong Tran, Julian Karst, Philipp Christ, Ulrich Hohenester, Thomas Weiss, Harald Giessen, Mario Hentschel

{"title":"Attoliter Mie Void Sensing","authors":"Serkan Arslan, Micha Kappel, Adrià Canós Valero, Thi Thu Huong Tran, Julian Karst, Philipp Christ, Ulrich Hohenester, Thomas Weiss, Harald Giessen, Mario Hentschel","doi":"10.1021/acsphotonics.5c01198","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c01198","url":null,"abstract":"Traditional nanophotonic sensing schemes utilize evanescent fields in dielectric or metallic nanoparticles, which confine far-field radiation in dispersive and lossy media. Apart from the lack of a well-defined sensing volume, these structures suffer from the generally limited access to the modal field, which is one key aspect for sensing performance. Recently, a novel strategy for dielectric nanophotonics has been demonstrated, namely, the resonant confinement of light in air. So-called Mie voids created in high-index dielectric host materials support localized resonant modes with exceptional properties. In particular, these structures benefit from the full access to the modal field confined strongly inside the void. We utilize these Mie voids for refractive index sensing in single voids with volumes down to 100 attoliters and sensitivities on the order of 400 nm per refractive index unit. Taking the noise of our measurements into account, we demonstrate detection of refractive index changes as small as 1 × 10–3 in a defined volume of just 390 attoliters. The combination of our Mie void sensor platform with appropriate surface functionalization will even enable specificity to biological or other analytes of smallest volumes while maintaining said sensitivity.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"26 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144479354","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

Hardware–Software Co-design Computational Framework and Hardware-Aware Training for Photonic Spiking Convolutional Networks with DFB-SA Laser DFB-SA激光光子脉冲卷积网络的软硬件协同设计计算框架和硬件感知训练

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-24 DOI: 10.1021/acsphotonics.4c02382

Chengyang Yu, Shuiying Xiang, Liyan Zhao, Xinran Niu, Wenzhuo Liu, Yuechun Shi, Licun Yu, Yue Hao

{"title":"Hardware–Software Co-design Computational Framework and Hardware-Aware Training for Photonic Spiking Convolutional Networks with DFB-SA Laser","authors":"Chengyang Yu, Shuiying Xiang, Liyan Zhao, Xinran Niu, Wenzhuo Liu, Yuechun Shi, Licun Yu, Yue Hao","doi":"10.1021/acsphotonics.4c02382","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02382","url":null,"abstract":"Neuromorphic computing stands out as a highly competitive computing paradigm capable of overcoming the bottlenecks inherent in von Neumann architectures. The spiking convolutional neural network (SCNN) is a prominent type of model within the realm of neuromorphic computing. Adapting SCNNs to photonic neuromorphic hardware holds great promise for significantly increasing the computation speed and fully leveraging its low energy consumption. In this paper, we develop an end-to-end design framework of photonic SCNN. We present the design of a SCNN tailored for a photonic platform utilizing distributed feedback lasers with a saturable absorber (DFB-SA laser) as the photonic spiking neurons. We also introduce hardware implementations for key computational steps in photonic SCNNs, including the nonlinear activation function, the convolutional layer, the fully connected layer, and the max-pooling layer. Additionally, a hardware-aware training method is proposed. Furthermore, we apply the designed network to classify the MNIST, Fashion-MNIST, and CIFAR-10 datasets, achieving accuracies of 96.52%, 90.48%, and 88.45%, respectively, in simulations on the test sets. And we experimentally validate the nonlinear activation function in the MNIST dataset classification task using the DFB-SA laser, achieving a classification accuracy of 96.06%. This study introduces a novel approach to deploying neural networks on hardware, presenting a portable, modular hardware simulation model and training method. This model is anticipated to be seamlessly integrated into the future hardware–software co-design of large-scale photonic SCNNs. Part of the hardware-aware training code is available at https://github.com/Oo-Fish-oO/Hardware-aware-training","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"48 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370982","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

Multifocal Metalens-Assisted Correlation Spectroscopy for Measuring Microfluidic Dynamics 多焦点超透镜辅助相关光谱法测量微流体动力学

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-23 DOI: 10.1021/acsphotonics.5c00405

Siqi Li, Lan Yu, Min Liu, Wenfu Zhang, Peng Gao, Guoxi Wang

引用次数: 0

All-Dielectric Meta-Atoms for Three-Dimensional Isotropic Chiral Metamaterials 三维各向同性手性超材料的全介电元原子

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-23 DOI: 10.1021/acsphotonics.5c00470

Ekin Gunes Ozaktas, Paul V. Braun, Shanhui Fan

引用次数: 0

N-Barrier-N Ga2O3 Photodetector Achieving Ultralow Equivalent Noise Power for Solar-Blind Detection 实现超低等效噪声功率用于太阳盲探测的n -势垒- n - Ga2O3光电探测器

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-23 DOI: 10.1021/acsphotonics.5c00586

Dianmeng Dong, Min Peng, Tao Zhang, Shichao Zhang, Xiaotong Ma, Yuanjun Tang, Yilin Cao, Qingyi Zhang, Fan Zhang, Yang Zhang, Zhenping Wu

{"title":"N-Barrier-N Ga2O3 Photodetector Achieving Ultralow Equivalent Noise Power for Solar-Blind Detection","authors":"Dianmeng Dong, Min Peng, Tao Zhang, Shichao Zhang, Xiaotong Ma, Yuanjun Tang, Yilin Cao, Qingyi Zhang, Fan Zhang, Yang Zhang, Zhenping Wu","doi":"10.1021/acsphotonics.5c00586","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00586","url":null,"abstract":"Solar-blind photodetectors operating in the deep ultraviolet (DUV) spectrum are critical for applications. However, the severe attenuation of DUV signals in the atmosphere demands photodetectors with ultralow noise and high sensitivity to resolve weak optical signals. Here, we report a breakthrough in β-Ga2O3-based n-Barrier-n (nBn) unipolar heterostructure photodetectors that synergistically address these challenges. By employing a β-Ga2O3/LaAlO3/Nb:SrTiO3 heterojunction fabricated via laser molecular beam epitaxy, we engineer a large conduction band offset and near-zero valence band offset, creating a unipolar electron transport channel that suppresses dark current to subpicoampere levels (<1 pA). The device exhibits exceptional performance metrics: a responsivity of 853.6 A/W, an external quantum efficiency of 4.2 × 105%, and a record-low noise-equivalent power (NEP) of 0.7 ± 0.1 fW/Hz1/2─surpassing state-of-the-art DUV detectors. These advancements are attributed to the high dielectric constant (∼24) and lattice compatibility of LaAlO3 with Nb:SrTiO3, which minimize interfacial defects and enhance carrier confinement. This work not only establishes a new paradigm for Ga2O3-based optoelectronics but also provides a universal design strategy for high-sensitivity, low-noise photodetectors in photon-starved environments, with transformative potential for deep-space communication and ultraviolet astronomy.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"247 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370869","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

Switchable Photon-Plasmon Coupling in a Single-Nanoparticle-Perturbed Microcavity 单纳米粒子微腔中可切换光子-等离子体耦合

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-21 DOI: 10.1021/acsphotonics.5c00943

Xiaoyan Zhang, Yin Yin, Jiawei Wang, Christian N. Saggau, Xiaoyu Wang, Xiaoyi Wu, Ling Bai, Junlin Liu, Oliver G. Schmidt, Libo Ma

{"title":"Switchable Photon-Plasmon Coupling in a Single-Nanoparticle-Perturbed Microcavity","authors":"Xiaoyan Zhang, Yin Yin, Jiawei Wang, Christian N. Saggau, Xiaoyu Wang, Xiaoyi Wu, Ling Bai, Junlin Liu, Oliver G. Schmidt, Libo Ma","doi":"10.1021/acsphotonics.5c00943","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00943","url":null,"abstract":"Single plasmonic nanoparticles coupled to a whispering-gallery-mode (WGM) microcavity provide an excellent platform to explore enhanced light–matter interactions. Here, we demonstrate switchable coupling between localized surface plasmon resonances (LSPRs) and three-dimensionally (3D) confined WGMs in an optoplasmonic system composed of a single gold nanorod and a microtubular cavity. The photon–plasmon coupling is efficiently switched between an “ON” and “OFF” state by tuning the excitation of the LSPR to match or mismatch the WGMs, where spectral match and spatial overlap play crucial roles. This switching phenomenon is indicated by the observations of spectral energy shifts, intensity variations, and spatial redistributions of the 3D confined WGMs. To explain the observed results, a deformed potential well model is introduced based on perturbation theory, where the polarizability and enhanced electric field induced by the single plasmonic nanorod are considered. The present work provides a convenient way to manipulate the photon–plasmon coupling in a hybrid optoplasmonic system, paving the way for controllable light–matter interactions and opening up promising applications in future subwavelength photonic technologies.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"147 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144340985","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

Beyond Water Content: Unraveling Stiffness in Hydrated Materials by a Correlative Brillouin–Raman Approach 超越含水量：用相关布里因-拉曼方法研究水合材料的解旋刚度

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-21 DOI: 10.1021/acsphotonics.5c00808

Alessandra Anna Passeri, Francesco Morena, Chiara Argentati, Francesco Bonacci, Igor Neri, Daniele Fioretto, Massimo Vassalli, Sabata Martino, Maurizio Mattarelli, Silvia Caponi

{"title":"Beyond Water Content: Unraveling Stiffness in Hydrated Materials by a Correlative Brillouin–Raman Approach","authors":"Alessandra Anna Passeri, Francesco Morena, Chiara Argentati, Francesco Bonacci, Igor Neri, Daniele Fioretto, Massimo Vassalli, Sabata Martino, Maurizio Mattarelli, Silvia Caponi","doi":"10.1021/acsphotonics.5c00808","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00808","url":null,"abstract":"Brillouin microscopy is revolutionizing bioimaging by enabling noninvasive, label-free mapping of the microscale mechanical properties of biological samples. However, the lack of a robust physical model to disentangle the significant influence of refractive index, density, and, most critically, water content on the Brillouin signal limits its applicability and widespread adoption in complex heterogeneous materials. To address this limitation, a novel Brillouin–Raman correlative microscopy approach is proposed and demonstrated on single cells. In particular, the effects of paraformaldehyde fixation on the morphological, mechanical, and chemical properties of HEK293T cells were investigated. Following fixation, an unexpected decrease in stiffness was observed, accompanied by compositional changes detected via Raman spectroscopy. By modeling cells as biphasic systems, consisting of water and dry mass, the hydration could be decoupled from the stiffness measurements. This approach represents a significant advance in biomechanical analysis, enabling the reliable interpretation of Brillouin data and facilitating the three-dimensional micromechanical characterization of biological materials. Furthermore, it has wide-ranging potential applications in biological research, particularly in contexts where hydration plays a fundamental role, paving the way for novel insights into the diagnosis and analysis of biomedical samples.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335222","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

Direct Interferometric Measurement of Nonreciprocity Induced by a Plasmonic Metasurface with False Chirality 假手性等离子体超表面诱导非互易的直接干涉测量

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-20 DOI: 10.1021/acsphotonics.5c00465

Ahmed Lafeef Ettapuram Naduvilepurayil, Harel Ginat, Fernando Lorén, Luis Martín-Moreno, Shmuel Sternklar, Yuri Gorodetski

{"title":"Direct Interferometric Measurement of Nonreciprocity Induced by a Plasmonic Metasurface with False Chirality","authors":"Ahmed Lafeef Ettapuram Naduvilepurayil, Harel Ginat, Fernando Lorén, Luis Martín-Moreno, Shmuel Sternklar, Yuri Gorodetski","doi":"10.1021/acsphotonics.5c00465","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00465","url":null,"abstract":"Nonreciprocity is an important scientific concept related to the broken symmetry of through a system in the forward and reverse directions. This effect lies in the origin of various applications including signal processing, noise reduction, unidirectional propagation, and sensing. Here, we show that propagation of Surface Plasmons (SP) within a structure having a false chirality exhibits a nonreciprocity. The SP waves propagating in opposite directions within the structure acquire opposite Pancharatnam–Berry (PB) phases. To detect this phase difference, we introduce a novel interferometric technique based on a customized Sagnac setup. The main advantages of our proposed system are high sensitivity to nonreciprocal phase changes, high precision incidence angle alignment, and the inspection of the k-space enabled by sufficiently wide range of incidence angles. We believe that a pivotal role of the nonreciprocity and its detection in numerous physical and chemical processes suggests a wide range of practical applications as well as deeper scientific insights.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"46 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335223","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

High-Contrast Transmissive Terahertz Programmable Metasurface Based on Liquid Crystal 基于液晶的高对比度透射太赫兹可编程超表面

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-06-20 DOI: 10.1021/acsphotonics.5c00938

Wei Zhu, Sheng Wang, Hangbing Guo, Da Tian, Lei Wang, Yucheng Xu, Fangyu Wan, Hengyu Cui, Xinyu Huang, Jingbo Wu, Kebin Fan, Caihong Zhang, Huabing Wang, Biao-bing Jin, Jian Chen, Peiheng Wu

引用次数: 0