ACS Photonics最新文献_第5页

Few-Mode Superposition for High-Efficiency Generation of Tailored Partially Coherent Light

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-18 DOI: 10.1021/acsphotonics.4c02613

Zhuoyi Wang, Xingyuan Lu, Hao Zhang, Junan Zhu, Xiaotan Lu, Yifeng Shao, H. Paul Urbach, Qiwen Zhan, Yangjian Cai, Chengliang Zhao

{"title":"Few-Mode Superposition for High-Efficiency Generation of Tailored Partially Coherent Light","authors":"Zhuoyi Wang, Xingyuan Lu, Hao Zhang, Junan Zhu, Xiaotan Lu, Yifeng Shao, H. Paul Urbach, Qiwen Zhan, Yangjian Cai, Chengliang Zhao","doi":"10.1021/acsphotonics.4c02613","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02613","url":null,"abstract":"Partially coherent light is essential in lithography systems, where it improves illumination homogenization, enhances resolution, and mitigates speckle noise, playing a key role in advanced imaging applications. However, efficiently generating and computing partially coherent beams (PCBs) remains a challenge, particularly in high-precision lithography where computational efficiency is critical. Here, we introduce a novel modal-superposition method for PCB synthesis, termed “few-mode superposition” and demonstrate its effectiveness in achieving PCBs with higher precision and efficiency. The method requires significantly fewer modes compared to conventional techniques while maintaining high accuracy in intensity and coherence. We apply the few-mode superposition method to the efficient generation of partially coherent light sources and computational lithography, showcasing its ability to rapidly produce PCBs with nonconventional cross-spectral density functions. This facilitates fast lithography simulations and other applications involving partially coherent light. Our approach significantly accelerates both the generation and calculation of PCBs and holds promise for integration with on-chip laser sources, as well as for high-energy laser generation and lithographic mask design.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"25 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143653920","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

Combining Bayesian Optimization, Singular Value Decomposition, and Machine Learning for Advanced Optical Design

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-17 DOI: 10.1021/acsphotonics.4c02157

M. R. Mahani, Igor A. Nechepurenko, Thomas Flisgen, Andreas Wicht

{"title":"Combining Bayesian Optimization, Singular Value Decomposition, and Machine Learning for Advanced Optical Design","authors":"M. R. Mahani, Igor A. Nechepurenko, Thomas Flisgen, Andreas Wicht","doi":"10.1021/acsphotonics.4c02157","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02157","url":null,"abstract":"The design and optimization of optical components, such as Bragg gratings, are critical for applications in telecommunications, sensing, and photonic circuits. To overcome the limitations of traditional design methods that rely heavily on computationally intensive simulations and large data sets, we propose an integrated methodology that significantly reduces these burdens while maintaining high accuracy in predicting optical response. First, we employ a Bayesian optimization technique to strategically select a limited yet informative number of simulation points from the design space, ensuring that each contributes maximally to the model’s performance. Second, we utilize singular value decomposition to effectively parametrize the entire reflectance spectrum into a reduced set of coefficients, allowing us to capture all significant spectral features without losing crucial information. Finally, we apply XGBoost, a robust machine learning algorithm, to predict the entire reflectance spectra from the reduced data set. The combination of Bayesian optimization for data selection, singular value decomposition (SVD) for full-spectrum fitting, and XGBoost for predictive modeling provides a powerful and generalizable framework for the design of optical components.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"88 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640256","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

Re-defining Non-tracking Solar Cell Efficiency Limits with Directional Spectral Filters

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-17 DOI: 10.1021/acsphotonics.4c02181

Alan R. Bowman, Samuel D. Stranks, Giulia Tagliabue

引用次数: 0

Tunable Photoconductivity Polarity in a Two-Dimensional Ferromagnet for Enhanced Image Recognition

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-17 DOI: 10.1021/acsphotonics.4c02315

Junning Mei, Yu Chen, Zefen Li, Jiaxin Wu, Shuangxing Zhu, Ruan Zhang, Ying Liu, Daoda An, Guanyuan Qiao, Shentong Li, Kenji Watanabe, Takashi Taniguchi, Fucai Liu, Xinghan Cai

{"title":"Tunable Photoconductivity Polarity in a Two-Dimensional Ferromagnet for Enhanced Image Recognition","authors":"Junning Mei, Yu Chen, Zefen Li, Jiaxin Wu, Shuangxing Zhu, Ruan Zhang, Ying Liu, Daoda An, Guanyuan Qiao, Shentong Li, Kenji Watanabe, Takashi Taniguchi, Fucai Liu, Xinghan Cai","doi":"10.1021/acsphotonics.4c02315","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02315","url":null,"abstract":"Exploring the optoelectronic characteristics of magnetic materials has the potential to merge the optical and magnetic functionalities within a spintronic system. This could pave the way for advancements in all-optical storage, photonic integrated circuits, and improved performance of photodetectors. In this work, we conduct a systematic analysis of the photoresponse in the two-dimensional ferromagnetic material Fe3GeTe2 (FGT) and discover the coexistence of positive photoconductivity (PPC) and negative photoconductivity (NPC), which can be toggled by adjusting either the light illumination power, bias voltage, or temperature. By modeling the photoresponse as it relates to various physical parameters, we determine that the photocurrent generation in the FGT nanoflake is driven by the bolometric effect, and the shift in photoconductivity polarity corresponds to the nonmonotonic resistance–temperature relationship of the conductive channel. Furthermore, we propose an enhanced image recognition vision system utilizing the FGT photodetector for extreme conditions, integrating the convolutional neural network algorithm to improve the image recognition accuracy in low-brightness and noise scenarios. Our findings delve into the combined optical, electrical, and magnetic modulation of two-dimensional ferromagnetic systems, potentially paving the way for new optoelectronic devices in the post-Moore era.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"20 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640258","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

Spatially Resolved Light-Induced Multiband Response of Controllable 2H-MoTe2/Graphene Vertical Heterojunction

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-15 DOI: 10.1021/acsphotonics.4c02148

Changyi Pan, Sheng Ni, Jiazhen Zhang, Donghai Zhang, Haoxuan Li, Xiaoyan Liu, Fengyi Zhu, Jingwei Ling, Chixian Liu, Tianye Chen, Rui Zhang, Tianning Zhang, Yufeng Shan, Changlong Liu, Yan Sun, Huiyong Deng, Ning Dai

{"title":"Spatially Resolved Light-Induced Multiband Response of Controllable 2H-MoTe2/Graphene Vertical Heterojunction","authors":"Changyi Pan, Sheng Ni, Jiazhen Zhang, Donghai Zhang, Haoxuan Li, Xiaoyan Liu, Fengyi Zhu, Jingwei Ling, Chixian Liu, Tianye Chen, Rui Zhang, Tianning Zhang, Yufeng Shan, Changlong Liu, Yan Sun, Huiyong Deng, Ning Dai","doi":"10.1021/acsphotonics.4c02148","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02148","url":null,"abstract":"The growing demand for multiband information acquisition has led to extensive interest in cost-effective, miniaturized multiband detection and imaging technologies that can be seamlessly integrated into other devices. However, the integration of conventional narrow band gap materials into discrete multiband photodetectors presents challenges in terms of sensitivity, room-temperature operation, and the high cost associated with epitaxial processes. Herein, we demonstrate a multiband photodetector based on a molybdenum ditelluride and graphene vertical heterojunction, showcasing the presence of two imbalanced back-to-back built-in electric fields induced by asymmetric band alignment. The analysis of spatially resolved photocurrent reveals that selective photoresponse, modulated by varying bias voltage, primarily originates from the switching of imbalanced built-in electric fields. Additionally, a remarkable photocurrent enhancement of 213% is achieved by modulating the built-in electric field with the gate voltage. The multiband detection device demonstrates a responsivity (R) of 18.6 A/W, a specific detectivity (D*) of 8.2 × 1011 cm·Hz1/2·W–1, and a fast rise/fall time of 112/114 μs across the spectrum from visible (520 nm) to infrared (1550 nm). Finally, precise imaging with a resolution better than 0.25 mm was successfully demonstrated, highlighting its significant potential for practical applications. Our proposed device provides an alternative strategy to design controllable, high-performance, multiband photodetectors based on asymmetric-breaking heterojunctions.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"92 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627492","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

Eliminating Triplet-State Annihilation and Converting Black Triplets into Bright Singlets for Enhancing Light Emission from Thermally Activated Delayed Fluorescence-Based OLEDs Driven by an Elaborately Designed Short Pulse Voltage

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-14 DOI: 10.1021/acsphotonics.4c02306

Bo Wang, Jing Chen, Jingjing Wang, Teng Peng, Junhong Liu, Jun Yang, Keyi Zhang, Yinqiong Zhou, Yuanjun Li, Qiang Li, Feng Chen, Jinfeng Guo, Qiusong Chen, Xiaoli Chen, Zuhong Xiong

{"title":"Eliminating Triplet-State Annihilation and Converting Black Triplets into Bright Singlets for Enhancing Light Emission from Thermally Activated Delayed Fluorescence-Based OLEDs Driven by an Elaborately Designed Short Pulse Voltage","authors":"Bo Wang, Jing Chen, Jingjing Wang, Teng Peng, Junhong Liu, Jun Yang, Keyi Zhang, Yinqiong Zhou, Yuanjun Li, Qiang Li, Feng Chen, Jinfeng Guo, Qiusong Chen, Xiaoli Chen, Zuhong Xiong","doi":"10.1021/acsphotonics.4c02306","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02306","url":null,"abstract":"Thermally activated delayed fluorescence-based organic light-emitting diodes (TADF-OLEDs) have attracted much attention in recent years; yet, it is confronted with the bottleneck of acute efficiency roll-off, which is mainly attributed to the triplet–triplet annihilation (TTA) and singlet–triplet annihilation (STA) induced by the accumulation of long-lived triplets at high current densities. However, our experimental observations herein demonstrate that the accumulation of triplets can also be governed by the duration of the applied voltage rather than solely by the well-accepted large current density. More importantly, we discover that replacing the conventional direct current (DC) driving source with an ingeniously designed short pulse voltage can effectively eliminate TTA and STA while harvesting the accumulated triplets to enhance the device's light emission. That is, an optimized short pulse width can ensure the triplet concentration is below the threshold for the occurrence of TTA and STA, while a suitable pulse interval provides sufficient time for converting black triplets into bright singlets via the reverse intersystem crossing process. Surprisingly, by employing such a simple experimental strategy of the optimized pulse drive, a significant enhancement of more than 90% in the light emission from 585 to 1114 cd m–2 is achieved compared to that driven by the DC source. Therefore, this work not only clarifies the excited-state dynamic processes within the duration of an applied voltage but also presents a feasible method to suppress TTA and STA, simultaneously harvesting triplets for enhancing light emission in TADF-OLEDs.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"5 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627493","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

Sculpting Angular Tolerance to Reshape Mid-Infrared Nonlocal Guided Resonances

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-13 DOI: 10.1021/acsphotonics.4c02398

Jui-Nung Liu, Wei-Chang Huang, Chi-Ting Weng, Tzu-Hsun Huang

{"title":"Sculpting Angular Tolerance to Reshape Mid-Infrared Nonlocal Guided Resonances","authors":"Jui-Nung Liu, Wei-Chang Huang, Chi-Ting Weng, Tzu-Hsun Huang","doi":"10.1021/acsphotonics.4c02398","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02398","url":null,"abstract":"Photonic crystal guided resonances (PCGRs) are an essential class of nonlocal resonant elements that drive various nanophotonic applications. Their Q-factor and efficiency are believed to be limited by highly dynamic dispersion, especially when a significant angular beam spread is inevitable, as in mid-infrared (MIR) spectroscopy. Here, we discover that the high-index slab’s thickness, along with the associated group index, provides a tuning knob not only for well-known optical confinement effects but also for the angular tolerance of the PCGR. With this new approach, we theoretically and experimentally demonstrate a ∼ 3-fold reduction in the angular sensitivity of the PCGR across a wide bandwidth, matching or even surpassing the performance of other state-of-the-art high-Q nonlocal metaresonators. This optimal angular tolerance enables a series of high-efficiency, angle-multiplexed PCGRs throughout a broad section of the MIR fingerprint region. This study overcomes the primary barrier to using PCGRs, setting the stage for future advancements in surface-enhanced MIR spectroscopy and numerous applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"4 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618948","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

Dynamics of Pulsed-Laser Interaction with Janus Particles

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-12 DOI: 10.1021/acsphotonics.4c02388

Alireza Khoshzaban, Alessandro Magazzú, Maria Grazia Donato, Onofrio M. Maragò, Mehmet Burcin Unlu, M. Natali Cizmeciyan, Parviz Elahi

{"title":"Dynamics of Pulsed-Laser Interaction with Janus Particles","authors":"Alireza Khoshzaban, Alessandro Magazzú, Maria Grazia Donato, Onofrio M. Maragò, Mehmet Burcin Unlu, M. Natali Cizmeciyan, Parviz Elahi","doi":"10.1021/acsphotonics.4c02388","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02388","url":null,"abstract":"Janus particles, with their flexible chemistry and multifunctionality, have broadened the scope of the optical manipulation field as an emerging class of materials. Laser-based manipulation is particularly promising for half-metal-coated particles, offering a platform to study optical and thermal effects. However, the role of the laser’s operation regime in particle behavior needs to be understood better. Hence, in this work, we studied the interaction of nanosecond-pulsed lasers on 4.1 μm Au-Janus particles with a 100 nm gold cap. We focused on the interaction in three sections: (1) We observed three pulse energy influence regimes: In the low-influence regime (less than ∼10 nJ), the particle maintains its intrinsic Brownian motion. In the medium-influence regime (less than ∼40 nJ), the particle exhibits an extended range of motion. In the high-influence regime (higher than ∼40 nJ), the particle undergoes superdiffusion and establishes a new equilibrium position. (2) During optical manipulation trials, a threshold pulse energy of 4 nJ (average power of 40 μW) was sufficient to move Au-Janus particles against the laser spot. We achieved translation velocities of 0.9–5.1 μm/s at 4–50 nJ. (3) The gold cap is damaged at 20 nJ (fluence of 0.7 J/cm2) when the laser is focused on the particle, consistent with theoretical predictions, and the ablation process generates micro- and submicrometer gold particles. These findings reveal the potential of pulsed lasers for precise, power-efficient manipulation of Janus particles, advancing our understanding of laser–particle interactions and opening new pathways for optical manipulation applications.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"17 1 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599355","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

Attosecond Transient Grating Spectroscopy with Near-Infrared Grating Pulses and an Extreme Ultraviolet Diffracted Probe

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-12 DOI: 10.1021/acsphotonics.4c02545

Rafael Quintero-Bermudez, Lauren Drescher, Vincent Eggers, Kevin Gulu Xiong, Stephen R. Leone

{"title":"Attosecond Transient Grating Spectroscopy with Near-Infrared Grating Pulses and an Extreme Ultraviolet Diffracted Probe","authors":"Rafael Quintero-Bermudez, Lauren Drescher, Vincent Eggers, Kevin Gulu Xiong, Stephen R. Leone","doi":"10.1021/acsphotonics.4c02545","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02545","url":null,"abstract":"Transient grating spectroscopy has become a mainstay among metal and semiconductor characterization techniques. Here, we extend the technique toward the shortest achievable time scales by using tabletop high-harmonic generation of attosecond extreme ultraviolet (XUV) pulses that diffract from transient gratings generated with sub-5 fs near-infrared (NIR) pulses. We demonstrate the power of attosecond transient grating spectroscopy (ATGS) by investigating the ultrafast photoexcited dynamics in an Sb semimetal thin film. ATGS provides an element-specific, background-free signal unfettered by spectral congestion, in contrast to transient absorption spectroscopy. With ATGS measurements in Sb polycrystalline thin films, we observe the generation of coherent phonons and investigate the lattice and carrier dynamics. Among the latter processes, we extract carrier thermalization, hot carrier cooling, and electron–hole recombination, which are on the order of 20 fs, 50 fs, and 2 ps time scales, respectively. Furthermore, the simultaneous collection of transient absorption and transient grating data allows us to extract the total complex dielectric constant in the sample dynamics with a single measurement, including the real-valued refractive index, from which we are also able to investigate carrier–phonon interactions and longer-lived phonon dynamics. The outlined experimental technique expands the capabilities of transient grating spectroscopy and attosecond spectroscopies by providing a wealth of information concerning carrier and lattice dynamics with an element-selective technique at the shortest achievable time scales.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"39 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608147","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

Ultralow-LO-Power Silicon Photonic Coherent Receiver with Balanced Ge/Si Avalanche Photodiodes

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-11 DOI: 10.1021/acsphotonics.4c02111

Weichao Sun, Hengzhen Cao, Jin Xie, Yuluan Xiang, Ting Chen, Jingshu Guo, Huan Li, Zejie Yu, Daoxin Dai

引用次数: 0