ACS Photonics最新文献_第8页

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-16

He Gao, Alekhya Ghosh, Arghadeep Pal, Keyi Zhong, Haochen Yan, Hao Zhang, Yongyong Zhuang, Ke Xu, Lu Sun, Shuangyou Zhang, Pascal Del’Haye, Wengang Bi, Hon Ki Tsang* and Yaojing Zhang*,

引用次数: 0

In-Situ Optimization of an Optoelectronic Reservoir Computer with Digital Delayed Feedback 数字延迟反馈光电储层计算机的原位优化

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-11 DOI: 10.1021/acsphotonics.5c01056

Fyodor Morozko, Shadad Watad, Amir Naser, Antonio Calà Lesina, Andrey Novitsky, Alina Karabchevsky

{"title":"In-Situ Optimization of an Optoelectronic Reservoir Computer with Digital Delayed Feedback","authors":"Fyodor Morozko, Shadad Watad, Amir Naser, Antonio Calà Lesina, Andrey Novitsky, Alina Karabchevsky","doi":"10.1021/acsphotonics.5c01056","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c01056","url":null,"abstract":"Reservoir computing (RC) is a powerful computational framework that addresses the need for efficient, low-power, and high-speed processing of time-dependent data. While RC has demonstrated strong signal processing and pattern recognition capabilities, its practical deployment in physical hardware is hindered by a critical challenge: the lack of efficient, scalable parameter optimization methods for real-world implementations. Traditionally, RC optimization has relied on software-based modeling, which limits the adaptability and efficiency of hardware-based systems, particularly in high-speed and energy-efficient computing applications. Herein, an in situ optimization approach was employed to demonstrate an optoelectronic delay-based RC system with digital delayed feedback, enabling direct, real-time tuning of system parameters without reliance on external computational resources. By simultaneously optimizing five parameters, normalized mean squared error (NMSE) values of 0.028, 0.561, and 0.271 are achieved in three benchmark tasks: waveform classification, time series prediction, and speech recognition, outperforming simulation-based optimization with NMSEs 0.054, 0.543, and 0.329, respectively, in two of the three tasks. This method enhances the feasibility of physical reservoir computing by bridging the gap between theoretical models and practical hardware implementation.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"9 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144630541","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

Near-Visible Low-Power Tuning of Nematic-Liquid Crystal Integrated Silicon Nitride Ring Resonator 向列式液晶集成氮化硅环形谐振器的近可见低功耗调谐

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-10 DOI: 10.1021/acsphotonics.5c00715

Jayita Dutta, Antonio Ferraro, Arnab Manna, Rui Chen, Alfredo Pane, Giuseppe Emanuele Lio, Roberto Caputo, Arka Majumdar

{"title":"Near-Visible Low-Power Tuning of Nematic-Liquid Crystal Integrated Silicon Nitride Ring Resonator","authors":"Jayita Dutta, Antonio Ferraro, Arnab Manna, Rui Chen, Alfredo Pane, Giuseppe Emanuele Lio, Roberto Caputo, Arka Majumdar","doi":"10.1021/acsphotonics.5c00715","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00715","url":null,"abstract":"The development of compact, low-power, and high-performance integrated photonic phase shifters is critical for advancing emerging technologies such as light detection and ranging (LiDAR), optical information processing, and quantum applications. Liquid crystal (LC)-based phase shifters offer a promising solution thanks to their large refractive index contrast and low power consumption. However, it remains challenging to incorporate LCs into integrated photonics, and the operating wavelength has been limited to the near-infrared. Here, we demonstrate a liquid-crystal-based phase shifter operating at 780 nm, a relevant wavelength for cold-atom-based quantum applications, by incorporating nematic LCs (E7) into a silicon nitride (SiN) ring resonator. Our device achieves ∼2π phase modulation with a very low power of 2.1 nW and a low driving voltage of ∼7 V with an exceptionally low Vπ·L (half wave voltage·length) value of 0.014 V·cm, enabling precise control over light propagation in a compact footprint. This work marks a significant step toward realizing low-power, compact, and efficient LC-integrated photonic circuits based on the SiN platform for next-generation LiDAR and quantum optical systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"671 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622548","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

Multiplexed Chromatin Analysis Using Optical Spectroscopic Statistical Nanosensing. 利用光学光谱统计纳米传感技术进行多路染色质分析。

IF 6.7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-10 DOI: 10.1021/acsphotonics.5c00311

Yuanzhe Su, Luay M Almassalha, Nicolas Acosta, Cody L Dunton, Karla I Medina, Emily Pujadas Liwag, Geng Wang, Vadim Backman

{"title":"Multiplexed Chromatin Analysis Using Optical Spectroscopic Statistical Nanosensing.","authors":"Yuanzhe Su, Luay M Almassalha, Nicolas Acosta, Cody L Dunton, Karla I Medina, Emily Pujadas Liwag, Geng Wang, Vadim Backman","doi":"10.1021/acsphotonics.5c00311","DOIUrl":"10.1021/acsphotonics.5c00311","url":null,"abstract":"In single cells, chromatin packs into organized structures to perform biological functions, such as RNA transcription regulation. Characterizing such structural behaviors, including packing density and mass scaling, is critical in epigenetics research. Partial wave spectroscopic (PWS) microscopy is a label-free, live-cell, high-throughput imaging modality that utilizes optical spectroscopic statistical nanosensing. Rather than resolving the exact chromatin packing structure, PWS extracts statistical packing information from spectroscopic interference signals. In this study, we evaluate its ability to characterize multiplexed chromatin packing density and mass scaling, as well as its spatial confidence interval, using finite difference time domain (FDTD) electromagnetic simulations. We validated the simulation-based analysis algorithm by comparing experimental PWS images against coregistered super-resolution acquisitions, confirming its accuracy in capturing chromatin packing metrics. We then applied this modality to live cells treated with different epigenetic agents, mapping spatial changes in chromatin packing in a high-throughput workflow.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":" ","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12288678/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144725902","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

Photoelectrochemical Probing of Hot Carrier Generation and Transfer in Gold Nanospheres 金纳米球中热载流子生成和转移的光电化学探测

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-09 DOI: 10.1021/acsphotonics.5c00964

Seokheon Kim, Sangwoon Yoon

{"title":"Photoelectrochemical Probing of Hot Carrier Generation and Transfer in Gold Nanospheres","authors":"Seokheon Kim, Sangwoon Yoon","doi":"10.1021/acsphotonics.5c00964","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00964","url":null,"abstract":"Understanding the generation and transfer of hot carriers in gold nanoparticles (AuNPs) is critical for advancing plasmonic photocatalysis and photovoltaics. Hot carriers are produced via nonradiative plasmon decay, yet the size dependence of their generation and the spatial range of their transfer remain underexplored. Here, we employ photoelectrochemical (PEC) methods to directly quantify the generation and transfer efficiencies of hot carriers in AuNPs. Size-controlled gold nanospheres (AuNSs) with diameters of 20, 32, 56, 74, and 98 nm are immobilized on ITO electrodes. Upon 532 nm laser excitation in a citrate-containing solution, hot holes oxidize citrate, and the resulting electron accumulation is measured via a photocurrent or open-circuit potential. We find that the hot carrier generation efficiency per absorbed photon decreases with an increasing AuNS size, exhibiting an inverse-square dependence on the AuNS diameter. To evaluate distance-dependent transfer efficiency, we introduce alkanethiol self-assembled monolayers (SAMs) of varying lengths onto the AuNS surfaces. The photocurrent decays exponentially with SAM thickness, revealing the spatial attenuation of the hot hole transfer. Our findings demonstrate the utility of PEC methods for probing plasmonic hot carriers and provide direct evidence for both size- and distance-dependent efficiencies.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"21 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586798","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

Built-In Electric Field for Efficient Charge Separation and Prolonged Carrier Lifetime at the Doped GaN Surface 内置电场用于有效的电荷分离和延长掺杂GaN表面的载流子寿命

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-07 DOI: 10.1021/acsphotonics.5c00868

Shengli Zhao, Jing Leng, Xianchang Yan, Fengke Sun, Peng Xu, Shengye Jin, Wenming Tian

{"title":"Built-In Electric Field for Efficient Charge Separation and Prolonged Carrier Lifetime at the Doped GaN Surface","authors":"Shengli Zhao, Jing Leng, Xianchang Yan, Fengke Sun, Peng Xu, Shengye Jin, Wenming Tian","doi":"10.1021/acsphotonics.5c00868","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00868","url":null,"abstract":"GaN-based materials have recently attracted continuous interest in optoelectronic and photocatalytic applications; however, the role of surface built-in electric fields, a critical determinant of carrier dynamics and device performance, remains poorly understood. Herein, we take GaN films as an example to explore the built-in field and charge separation dynamics at various GaN surfaces using transient reflection (TR) spectroscopy. Unlike undoped GaN films without a built-in field, both the TR spectra of n-type and p-type doped GaN films exhibit remarkable Franz–Keldysh oscillation above the bandgap, confirming the presence of an intrinsic built-in field. Driven by the built-in field, photogenerated carriers at the doped GaN surfaces undergo ultrafast charge separation within ∼4.0 ps, achieving a remarkably prolonged carrier lifetime of up to 13.9 μs, which is 4 orders of magnitude longer than that in undoped GaN. Furthermore, the charge separation dynamics in the n-GaN film is quantitatively analyzed using a one-dimensional drift-diffusion model, yielding an intrinsic built-in field of ∼37 kV/cm. Our findings might offer new insights into the rational design of efficient GaN-based photocatalytic systems and optoelectronic devices.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"690 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586799","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

Dynamic Ultrafast Laser-Induced Structural Changes and Extreme Nanostructuring in Hard Dielectric Materials 硬介电材料的动态超快激光诱导结构变化和极端纳米结构

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-03 DOI: 10.1021/acsphotonics.5c00554

Rajeev Dwivedi, Huu Dat Nguyen, Sergio Sao Joao, Anne-Magali Seydoux-Guillaume, Thirunaukkarasu Kuppan, Ciro D’Amico, Guillaume Kermouche, Razvan Stoian

{"title":"Dynamic Ultrafast Laser-Induced Structural Changes and Extreme Nanostructuring in Hard Dielectric Materials","authors":"Rajeev Dwivedi, Huu Dat Nguyen, Sergio Sao Joao, Anne-Magali Seydoux-Guillaume, Thirunaukkarasu Kuppan, Ciro D’Amico, Guillaume Kermouche, Razvan Stoian","doi":"10.1021/acsphotonics.5c00554","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00554","url":null,"abstract":"Understanding matter transformation under light enables ultrafast 3D laser structuring to attain precise control down to the nanoscale. This is challenging for hard crystals given their mechanical resistance; nonetheless, it is key in structurally designing matter, pendling between crystalline and amorphous phases. The particular time evolution of structural and morphological changes can pinpoint either dynamics related to shock compaction or to thermal relaxation with phase transition. We report quantified the time-resolved dynamics of laser modifications induced by nondiffractive ultrafast laser beams in bulk sapphire using qualitative and quantitative phase-contrast microscopy to link optical changes to thermodynamic and structural evolutions. The final morphological changes of irradiated structures are revealed by high-resolution electron microscopy. Observations confirm that Bessel pulse irradiation transforms the pristine crystalline structure into a homogeneous amorphous phase in tens of ns, via the passage through a liquid phase nucleated at the early stages of the process. This ns-lived liquid phase is subject to cavitation at higher energy concentrations on the cooling phase (100 ns), facilitating nanoscale void fabrication with high aspect ratios. The outcomes strongly support bulk modification without shock assistance, governed instead by thermal relaxation. This determines a robust path for extreme laser structuring down to the nanoscale.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"150 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547624","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

Generation and Control of Higher-Order-Mode Lasers in Multimode Silicon Resonators 多模硅谐振腔中高阶模激光器的产生与控制

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-03 DOI: 10.1021/acsphotonics.5c00198

He Gao, Alekhya Ghosh, Arghadeep Pal, Keyi Zhong, Haochen Yan, Hao Zhang, Yongyong Zhuang, Ke Xu, Lu Sun, Shuangyou Zhang, Pascal Del’Haye, Wengang Bi, Hon Ki Tsang, Yaojing Zhang

{"title":"Generation and Control of Higher-Order-Mode Lasers in Multimode Silicon Resonators","authors":"He Gao, Alekhya Ghosh, Arghadeep Pal, Keyi Zhong, Haochen Yan, Hao Zhang, Yongyong Zhuang, Ke Xu, Lu Sun, Shuangyou Zhang, Pascal Del’Haye, Wengang Bi, Hon Ki Tsang, Yaojing Zhang","doi":"10.1021/acsphotonics.5c00198","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00198","url":null,"abstract":"The generation and control of multidimensional optical fields play a crucial role in advancing applications such as optical communications, sensing, information encoding, and imaging, by maximizing the utilization of optical degrees of freedom and enabling multiple optical channels. Optical lasers are fundamental to these applications as the primary sources of optical fields. However, previous work mainly focused on realizing light sources based on fundamental modes, leaving higher-order modes underutilized. Here, we propose an approach for generating and controlling an on-chip higher-order-mode light source from Raman lasing. We chose the fourth-order mode as an example and generated the fourth-order mode lasing using a compact, high-quality multimode silicon racetrack resonator. The multimode racetrack resonator has a compact footprint of 0.13 mm2 using two adiabatic bends and exhibits a high-quality factor of over 1 × 106. The lasing threshold was measured as 0.6 mW. Finally, we show that controlling the higher-order-mode lasing enables mode-switching behavior, which can find potential applications in high-resolution optical systems and quantum optics.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"48 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547623","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

Polarization-Dependent Laser-Assisted Cutting of Glass Using a Nondiffractive Beam in the MHz Burst Regime 偏振相关的激光辅助切割玻璃在MHz爆发区使用非衍射光束

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-02 DOI: 10.1021/acsphotonics.5c00679

Juozas Dudutis, Aleksandras Kondratas, Paulius Gečys

引用次数: 0

Photoactivation of Color Centers Induced by CW Laser Irradiation in Ion-Implanted Diamond 连续波激光辐照离子注入金刚石色心的光活化研究

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-07-01 DOI: 10.1021/acsphotonics.5c00826

Vanna Pugliese, Elena Nieto Hernández, Emilio Corte, Marco Govoni, Sviatoslav Ditalia Tchernij, Paolo Olivero, Jacopo Forneris

{"title":"Photoactivation of Color Centers Induced by CW Laser Irradiation in Ion-Implanted Diamond","authors":"Vanna Pugliese, Elena Nieto Hernández, Emilio Corte, Marco Govoni, Sviatoslav Ditalia Tchernij, Paolo Olivero, Jacopo Forneris","doi":"10.1021/acsphotonics.5c00826","DOIUrl":"https://doi.org/10.1021/acsphotonics.5c00826","url":null,"abstract":"Split-vacancy color centers in diamonds are promising solid-state platforms for the implementation of photonic quantum technologies. These luminescent defects are commonly fabricated upon low-energy ion implantation and subsequent thermal annealing. Their technological uptake will require the availability of reliable methods for the controlled, large-scale production of localized individual photon emitters. This task is partially achieved by controlled ion implantation to introduce selected impurities in the host material and requires the development of challenging beam focusing or collimation procedures coupled with single-ion detection techniques. We report on the protocol for the direct optical activation of split-vacancy color centers in diamond via localized processing with a continuous-wave laser at mW optical powers. We demonstrate the activation of photoluminescent Mg- and Sn-related centers at both the ensemble and single-photon emitter levels in ion-implanted, high-purity diamond crystals without further thermal processing. The proposed lithographic method enables the activation of individual color centers at specific positions of a large-area sample by means of a relatively inexpensive equipment offering real-time, in situ monitoring of the process.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533679","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