ACS Photonics最新文献_第9页

Femtosecond Laser-Induced Ultrafast Carrier Dynamics in Ferroelectric and Paraelectric BaTiO3: Exploring Domain Wall Effects 飞秒激光诱导铁电和准电BaTiO3的超快载流子动力学：探索畴壁效应

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-26 DOI: 10.1021/acsphotonics.4c01427

Zefang Lv, Qiming Yuan, Jie Chen, Runze Li

{"title":"Femtosecond Laser-Induced Ultrafast Carrier Dynamics in Ferroelectric and Paraelectric BaTiO3: Exploring Domain Wall Effects","authors":"Zefang Lv, Qiming Yuan, Jie Chen, Runze Li","doi":"10.1021/acsphotonics.4c01427","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01427","url":null,"abstract":"Ferroelectric materials are promising candidates in solar-energy conversion applications and the development of next-generation photoelectronic devices. The internal depolarization fields and associated domain walls are believed to significantly affect macroscopic photoelectrical properties of ferroelectric materials. However, their roles during the ultrafast relaxation of photon-generated carriers at its intrinsic excitation temporal scale are not yet fully understood. Using femtosecond time-resolved optical reflectivity measurements, we found that the carrier lifetime is ∼200 ps shorter in ferroelectric phase BaTiO3 than in the paraelectric phase. This difference cannot be fully explained by the commonly used trap-assisted and second-order recombination models. We propose a theoretical model to incorporate drifting of photoelectrons due to the depolarization field and recombination processes within the domain wall region. Our model provides excellent numeric fitting to the ultrafast optical reflectivity measurements across various pump fluences and specimen base temperatures. The method presented in this study can be generalized to the carrier relaxation dynamics of other ferroelectric materials, to provide better understanding on the role of domain walls on nonequilibrium relaxation dynamics of carriers. Additionally, the picosecond evolution of domain wall charges revealed by our model suggests the potential for developing photodevices with ultrafast optical modulation of ferroelectric BaTiO3.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"91 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142888398","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

Activating Intrinsic Self-Trapped Exciton Emission in Bismuth Oxyhalides by Edge Iodine Doping 边碘掺杂激活氧化卤化铋中本征自困激子发射

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-26 DOI: 10.1021/acsphotonics.4c01770

Xin He, Jiazheng Diao, Qi Yao, Hui Wang, Xia Zhong, Wen Si, Qiang Fu, Long Yuan, Xiaodong Zhang, Yi Xie

{"title":"Activating Intrinsic Self-Trapped Exciton Emission in Bismuth Oxyhalides by Edge Iodine Doping","authors":"Xin He, Jiazheng Diao, Qi Yao, Hui Wang, Xia Zhong, Wen Si, Qiang Fu, Long Yuan, Xiaodong Zhang, Yi Xie","doi":"10.1021/acsphotonics.4c01770","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01770","url":null,"abstract":"Bismuth oxyhalides (BiOX, X = F, Cl, Br, I) have gained great attention in optoelectronics, radiation detectors, and photocatalysis due to their unique layered structure and electronic properties. However, the elusive understanding of photoexcited-state properties, particularly the broad sub-bandgap emission previously associated with defect-induced states in BiOX, impedes the relevant photoinduced-species regulation. Herein, by taking BiOBr as an example, we elucidate the sub-bandgap emission to originate from the radiative decay of self-trapped excitons (STEs). Such a radiative process could be effectively activated by edge iodine doping. Spectroscopic analyses and theoretical calculations verify enhanced exciton–phonon interaction, and symmetry breaking account for the STE-emission activation in BiOBr with iodine incorporation. Besides, by tuning halide composition, the energies of STEs in BiOClxBr1–x could be facilely regulated from 2.5 to 2.16 eV, promisingly enabling photoexcited applications such as photoluminescence and energy-transfer-mediated photocatalytic small molecule activation. This work uncovers the intrinsic STE states in BiOX and provides new insights into the regulation of the involved photoexcited-state properties.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"1 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142886784","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

Novel Photosensitive Dielectric-Based Image Sensor with Both High Signal-to-Noise Ratio and High Fill Factor 新型高信噪比、高填充系数的光敏电介质图像传感器

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-26 DOI: 10.1021/acsphotonics.4c02229

Rui Zhu, Andrej Kuznetsov, Augustinas Galeckas, Yonghui Zhang, Huili Liang, Guangyu Zhang, Zengxia Mei

引用次数: 0

Window into the Brain: In Vivo Multiphoton Imaging 大脑之窗：体内多光子成像

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-24 DOI: 10.1021/acsphotonics.4c00958

Shahrzad Latifi, A. Courtney DeVries

引用次数: 0

Intermittent “Invisible” Soliton Pulsations Induced by the Temporal-Gain Dynamics in Passively Mode-Locked Fiber Lasers 被动锁模光纤激光器中时间增益动态诱导的间歇性“不可见”孤子脉动

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-24 DOI: 10.1021/acsphotonics.4c02227

Qingbo Wang, Pan Wang, Zhi Wang, Jiangyong He, Qiaoqiao Xu, Shijie Sun, Zhifeng Shi, Yange Liu

{"title":"Intermittent “Invisible” Soliton Pulsations Induced by the Temporal-Gain Dynamics in Passively Mode-Locked Fiber Lasers","authors":"Qingbo Wang, Pan Wang, Zhi Wang, Jiangyong He, Qiaoqiao Xu, Shijie Sun, Zhifeng Shi, Yange Liu","doi":"10.1021/acsphotonics.4c02227","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02227","url":null,"abstract":"Gain, as one of the critical parameters in passively mode-locked fiber lasers (PMLFLs), fluctuates periodically in the time domain, including the fast depletion and slow recovery processes. Unfortunately, since there are few soliton dynamics phenomena that can properly reflect its effect, time-varying gain is rarely considered a research topic in studying the nonlinear dynamics of fiber lasers. Here, based on the transformation of soliton states, the effects of the temporal-gain dynamics (TGD) on soliton evolutions are theoretically speculated and experimentally demonstrated, and a novel nonlinear dynamics phenomenon - intermittent “invisible” pulsation (IIP) is reported. The IIP is ultimately generated by the accumulation and consumption of gain residues. In addition to the fundamental frequency regime, the generation of IIP is also observed in the harmonic mode-locking regime, and the evolution characteristics of each pulse train are very similar to those in the fundamental frequency regime, demonstrating the independence of the evolution of each pulse train during harmonic mode-locking IIP and verifying the universality of IIP. Apart from providing new insights into the study of intermittent dynamics in ultrafast lasers, this research will also provide new ideas for the study of TGD in ultrafast fiber lasers.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"14 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880122","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

Hyperbolic Topological Frequency Combs 双曲拓扑频率梳

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-24 DOI: 10.1021/acsphotonics.4c01546

Lei Huang, Weixuan Zhang, Yingxu Zong, Lu He, Xiangdong Zhang

{"title":"Hyperbolic Topological Frequency Combs","authors":"Lei Huang, Weixuan Zhang, Yingxu Zong, Lu He, Xiangdong Zhang","doi":"10.1021/acsphotonics.4c01546","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01546","url":null,"abstract":"On-chip generation of optical frequency combs (OFCs) holds fundamental significance for a wide range of applications, such as precision metrology, optical communications, and so on. Recent investigations have shown that OFCs can be generated in a topologically coupled array of ring resonators, providing a novel avenue to engineer nested temporal solitons and robust comb spectra. However, limited by the bulk-edge correspondence, the implementation of topological frequency combs always requires a substantial number of auxiliary bulk ring resonators, diminishing the ratio of edge ring resonators for OFC generation. Here, we propose a new approach to generate OFCs and nested temporal solitons using hyperbolic photonic topological insulators. Our designed hyperbolic topological OFCs exhibit a significantly reduced frequency spacing compared to that of conventional topological OFCs with the same number of optical rings. Thus, for achieving the same frequency spacing, hyperbolic topological OFCs require much fewer ring resonators than conventional topological OFCs in Euclidean space, giving an extremely improved utilization efficiency of ring resonators. Furthermore, the robustness of hyperbolic topological OFCs is also demonstrated. Our results open up a promising avenue for establishing highly efficient nonlinear topological devices.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"65 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880120","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

Exploring the Influence of Localized Surface Plasmon and Sol–Gel Passivation on Blue InGaN/GaN Micro/Nano Light Emitting Diodes 探索局部表面等离子体激元和溶胶-凝胶钝化对蓝色InGaN/GaN微/纳米发光二极管的影响

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-24 DOI: 10.1021/acsphotonics.4c01808

Yeong-Hoon Cho, Seungjae Baek, Pil-Kyu Jang, Jiwon Park, Sangbum Kim, Taehwan Kim, Periyayya Uthirakumar, In-Hwan Lee

{"title":"Exploring the Influence of Localized Surface Plasmon and Sol–Gel Passivation on Blue InGaN/GaN Micro/Nano Light Emitting Diodes","authors":"Yeong-Hoon Cho, Seungjae Baek, Pil-Kyu Jang, Jiwon Park, Sangbum Kim, Taehwan Kim, Periyayya Uthirakumar, In-Hwan Lee","doi":"10.1021/acsphotonics.4c01808","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01808","url":null,"abstract":"Micro light-emitting diodes (μLEDs) and nano LEDs (nLEDs) are attracting considerable interest as potential candidates for next-generation displays. However, both μLEDs and nLEDs encounter the major challenge of decreasing the external quantum efficiency (EQE) as their size diminishes. To address this issue, this study explores the effect of localized surface plasmon (LSP) and sol–gel passivation on the performance of blue μLEDs and nLED arrays. The nLED arrays are composed of several nLEDs and are designed to have the same chip area as the μLEDs. The nLED arrays have a larger surface-to-volume ratio compared to μLEDs, resulting in lower efficiency due to effects such as surface recombination. However, the nLED allows Ag/SiO2 nanoparticles to be positioned in proximity to the sidewalls where the multi-quantum wells are exposed and has an advantage in maximizing the LSP coupling effect and enhancing the impact of sol–gel passivation. As a result, when both effects are applied, the EQE values increased from 3.47%–7.02% to 5.64%–8.08% for μLEDs and from 1.29%–5.22% to 4.90%–9.60% for nLEDs, as the size increases from 10 to 50 μm. Specifically, the EQE enhancement resulting from the application of the LSP coupling effect in nLEDs ranges from 50%–200%, which is significantly higher compared to μLEDs. The proposed approach provides insights into the influence of the LSP coupling effect combined with sol–gel passivation on enhancing the efficiency of μLEDs and nLEDs for next-generation displays","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"6 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880121","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

Rotational Photonic Spin Hall Effect Sensor for Liquid Chemicals Classification via EfficientNet-V2 基于EfficientNet-V2的液体化学品分类旋转光子自旋霍尔效应传感器

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-23 DOI: 10.1021/acsphotonics.4c01913

Kang Zeng, Linzhou Zeng, Peng Yang, Yougang Ke, Zhiwei Huang

引用次数: 0

Unveiling the Effect of Synthetic Atmospheric Humidity on the Performance of FAPbBr3 Nanocrystals and Their PeLEDs 揭示合成大气湿度对FAPbBr3纳米晶体及其ped性能的影响

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-23 DOI: 10.1021/acsphotonics.4c01811

Qinglin Zeng, Jibin Zhang, Xinzhen Ji, Meng Wang, Shuailing Lin, Meng Su, Qianli Liu, Linyuan Lian, Mochen Jia, Xu Chen, Zhuangzhuang Ma, Ying Liu, Yanbing Han, Yongtao Tian, Xin-Jian Li, Zhifeng Shi

{"title":"Unveiling the Effect of Synthetic Atmospheric Humidity on the Performance of FAPbBr3 Nanocrystals and Their PeLEDs","authors":"Qinglin Zeng, Jibin Zhang, Xinzhen Ji, Meng Wang, Shuailing Lin, Meng Su, Qianli Liu, Linyuan Lian, Mochen Jia, Xu Chen, Zhuangzhuang Ma, Ying Liu, Yanbing Han, Yongtao Tian, Xin-Jian Li, Zhifeng Shi","doi":"10.1021/acsphotonics.4c01811","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01811","url":null,"abstract":"The polar solvent of water can disrupt the structure of lead halide perovskite nanocrystals (PeNCs), and its presence is inevitable during the synthesis process. Therefore, it is crucial to understand the impact of synthetic atmospheric humidity on the performance of PeNCs and their electroluminescence. In this study, we first synthesized formamidine lead bromide (FAPbBr3) PeNCs at different relative air humidities and explored their optoelectronic properties and electroluminescence. We found that under optimal humidity conditions (40% R.H.), water molecules can reduce the nucleation growth barrier of PeNCs through ligand replacement. This process results in nanocrystals with good crystallinity and fewer defects, thereby reducing defect states and nonradiative recombination. The perovskite light-emitting diodes (PeLEDs) based on these FAPbBr3 PeNCs exhibit a maximum luminance of 39,000 cd m–2 and a peak external quantum efficiency of 16.2%, surpassing most reported values in the literature without the use of any additional additives. This study elucidates the role of atmospheric humidity in the growth of PeNCs and introduces the concept of humidity-assisted synthesis, which is crucial for scaling up production in the industry.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"41 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874104","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

Inverse Design of Multiplexable Meta-Devices for Imaging and Processing 多路成像与处理元器件的逆向设计

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-12-20 DOI: 10.1021/acsphotonics.4c01560

Zi-Xin Zhou, Xin-Yi Zhang, Hao-Ran Qin, Zi-Xuan Gao, Ye-Ang Zhang, Chunyu Huang, Fenzhen Fang, Yan-Qing Lu, Jun-Long Kou

引用次数: 0