IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-05-29 DOI: 10.1002/lpor.202500224

Nima Asoudegi, Mo Mojahedi

{"title":"Orbital Angular Momentum Holography Using Neural Network and Camera in the Loop","authors":"Nima Asoudegi, Mo Mojahedi","doi":"10.1002/lpor.202500224","DOIUrl":"https://doi.org/10.1002/lpor.202500224","url":null,"abstract":"Orbital Angular Momentum (OAM), a spatial mode of light, is employed as an information carrier for encryption and multiplexing in optical communication and holography. Conventional methods for designing OAM‐multiplexed holograms exhibit suboptimal reconstruction accuracy as the number of multiplexed channels exceeds the nominal multiplexing capacity. Reconstruction quality further degrades in practical systems due to optical aberrations and imperfections in holographic displays. In this work, two methods are proposed, a Gradient Descent (GD) optimization and a deep learning approach, for designing OAM‐multiplexed phase‐only holograms. Both methods are integrated with a Camera‐In‐The‐Loop (CITL) calibration technique that learns a realistic parameterized propagation model to compensate for system imperfections. The experimental results show that when operating at twice the nominal OAM multiplexing capacity, the proposed GD and neural network methods combined with CITL calibration, reduce cross‐correlation errors in reconstructed images by up to 82% and 58% compared to the conventional method, respectively. These methods enable accurate, high capacity, and real‐time OAM‐multiplexed holography in practical optical systems.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"5 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176572","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

Impact of threading dislocations on the V-defect assisted lateral carrier injection and recombination in InGaN quantum well LEDs InGaN量子阱led中螺纹位错对v缺陷辅助横向载流子注入和复合的影响

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-29 DOI: 10.1063/5.0271165

Rinat Yapparov, Alejandro Quevedo, Tanay Tak, Shuji Nakamura, Steven P. DenBaars, James S. Speck, Saulius Marcinkevičius

{"title":"Impact of threading dislocations on the V-defect assisted lateral carrier injection and recombination in InGaN quantum well LEDs","authors":"Rinat Yapparov, Alejandro Quevedo, Tanay Tak, Shuji Nakamura, Steven P. DenBaars, James S. Speck, Saulius Marcinkevičius","doi":"10.1063/5.0271165","DOIUrl":"https://doi.org/10.1063/5.0271165","url":null,"abstract":"The nonuniform hole distribution between InGaN quantum wells (QWs) of light emitting diodes (LEDs) has a negative impact on LED efficiency. The uniformity can be increased by using lateral hole injection through sidewalls of V-defects, which form at threading dislocations. However, the inherent coupling between the V-defects and dislocations might affect efficiency of the hole injection and nonradiative recombination. In this work, we have tested the possible impact of the dislocations on the injection and recombination by means of scanning near-field electroluminescence and photoluminescence spectroscopy on single green-emitting InGaN QW LEDs containing large (∼0.5 μm) V-defects. The measurements have not provided any evidence of a lower hole injection efficiency or enhanced nonradiative recombination at the dislocations located at the V-defect facets or their apexes. This shows that large V-defects are excellent volumetric injectors for long wavelength InGaN LEDs. Furthermore, it was established that V-defects are preferential hole injectors even in single quantum well devices. Compared to vertical injection, the V-defect injection allows lowering the operating voltage, which should contribute to an enhanced wall plug efficiency.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"31 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Selective Regulation of Mid-Infrared Emissivity for Passive Cooling and Air Source Heating 被动冷却和空气源加热中红外发射率的选择性调节

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-05-29 DOI: 10.1002/lpor.202500600

Xiansheng Li, Meiling Liu, Runze Wu, Chengming Wang, Chongwen Zou, Bin Zhao, Gang Pei

{"title":"Selective Regulation of Mid-Infrared Emissivity for Passive Cooling and Air Source Heating","authors":"Xiansheng Li, Meiling Liu, Runze Wu, Chengming Wang, Chongwen Zou, Bin Zhao, Gang Pei","doi":"10.1002/lpor.202500600","DOIUrl":"https://doi.org/10.1002/lpor.202500600","url":null,"abstract":"The “atmospheric window” functions as a channel for radiative heat exchange between radiators on the Earth's surface and the cold background of space. Passive radiative heating and cooling can be achieved by regulating the heat exchange of radiators with the atmosphere and space through customized mid-infrared spectral properties, particularly within the “atmospheric window” band. Given that single-function passive cooling or heating is constrained by dynamic thermal demand variations, materials with tunable spectral properties are attracting increasing attention. A vanadium dioxide (VO<sub>2</sub>) -based temperature-adaptive emissivity structure is designed to enable passive cooling and heating. At high temperatures, this structure exhibits a high emissivity of 0.81 within the “atmospheric window” (8–13 µm), enabling passive radiative heat dissipation through this spectral band. Conversely, at low temperatures, the structure exhibits a low emissivity (0.11) within the “atmospheric window” and a high emissivity (0.6) in other spectral regions (5–8 µm and 13–20 µm), which can suppresses radiative heat dissipation while facilitating heat absorption from atmospheric radiation, thereby achieving passive radiative heating through thermal exchange with the atmospheric environment. Then, the dynamic radiative cooling potential is evaluated through numerical calculations.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"16 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177014","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

Experimental targets for dark photon dark matter 暗光子暗物质的实验目标

IF 5 2区物理与天体物理

Physical Review D Pub Date : 2025-05-29 DOI: 10.1103/physrevd.111.103535

David Cyncynates, Zachary J. Weiner

{"title":"Experimental targets for dark photon dark matter","authors":"David Cyncynates, Zachary J. Weiner","doi":"10.1103/physrevd.111.103535","DOIUrl":"https://doi.org/10.1103/physrevd.111.103535","url":null,"abstract":"Ultralight dark photon dark matter features distinctive cosmological and astrophysical signatures and is also supported by a burgeoning direct-detection program searching for its kinetic mixing with the ordinary photon over a wide mass range. Dark photons, however, cannot necessarily constitute the dark matter in all of this parameter space. In minimal models where the dark photon mass arises from a dark Higgs mechanism, early-Universe dynamics can easily breach the regime of validity of the low-energy effective theory for a massive vector field. In the process, the dark sector can collapse into a cosmic string network, precluding dark photons as viable dark matter. We establish the general conditions under which dark photon production avoids significant backreaction on the dark Higgs and identify regions of parameter space that naturally circumvent these constraints. After surveying implications for known dark photon production mechanisms, we propose novel models that set well-motivated experimental targets across much of the accessible parameter space. We also discuss complementary cosmological and astrophysical signatures that can probe the dark sector physics responsible for dark photon production. Published by the American Physical Society 2025 ","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"3 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Few-shot source range estimation based on acoustic arrival structures in deep sea 基于声到达结构的深海少射源距离估计

IF 3.4 2区物理与天体物理

Applied Acoustics Pub Date : 2025-05-29 DOI: 10.1016/j.apacoust.2025.110849

Qianqian Li , Qi Li , Zhenglin Li , Jixing Qin

{"title":"Few-shot source range estimation based on acoustic arrival structures in deep sea","authors":"Qianqian Li , Qi Li , Zhenglin Li , Jixing Qin","doi":"10.1016/j.apacoust.2025.110849","DOIUrl":"10.1016/j.apacoust.2025.110849","url":null,"abstract":"<div><div>Theoretical analysis indicates that variations in source range cause significant differences in acoustic arrival structures in the depth-time domain. Therefore, this paper proposes for the first time to use the arrival structure of the acoustic field as input features and to employ a two-dimensional convolutional neural network (2D-CNN) for underwater acoustic source localization from an image recognition perspective. To address the source range estimation with limited observed data, a transfer learning model is constructed. Based on pre-training with simulated data generated by the acoustic propagation model, the model is further trained on small-sample observed acoustic data from the detection area. Through sensitivity analysis, the impact of mismatched environmental parameters on source localization is investigated. Simulation results demonstrate that the proposed method exhibits superior performance and stronger robustness compared to traditional matched-field processing. Experimental results from the South China Sea show that the localization performance is much better compared to the conventional matched field processing (MFP) and the 2D-CNN method. For range predictions, the mean absolute percentage error (MAPE) is less than 5 % for the source up to 30 km.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"239 ","pages":"Article 110849"},"PeriodicalIF":3.4,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Controlling the Afterglow of Carbon Dot Composite Materials Through pH Value and the Application in Information Encryption 通过pH值控制碳点复合材料的余辉及其在信息加密中的应用

IF 11 1区物理与天体物理

Laser & Photonics Reviews Pub Date : 2025-05-29 DOI: 10.1002/lpor.202402270

Yufeng Chang, Fuying Wang, Fuxing Li, Mingjun Chen, Jinxing Zhao, Fenghe Wang, Li Guan, Xu Li, Nian Fu

{"title":"Controlling the Afterglow of Carbon Dot Composite Materials Through pH Value and the Application in Information Encryption","authors":"Yufeng Chang, Fuying Wang, Fuxing Li, Mingjun Chen, Jinxing Zhao, Fenghe Wang, Li Guan, Xu Li, Nian Fu","doi":"10.1002/lpor.202402270","DOIUrl":"https://doi.org/10.1002/lpor.202402270","url":null,"abstract":"Phosphorescence (Phos) materials with tunable delay time can provide more modes of anti-counterfeiting and information encryption. Carbon dots (CDs), a novel nanomaterial, exhibit remarkable optical properties and potential. Matrix assistance is an effective method to realize CDs delayed emission. Here, a new CDs composite material (AB-CDs) is prepared using biuret and 2,4,6-Triphenylboroxin by hydrothermal treatment, which achieves fluorescence (FL) emission at 296 nm and Phos emission at 456 nm under 260 nm excitation. Under 365 nm excitation, delayed luminescence peaked at 456 nm can be observed with the naked eye for up to 5 s. By utilizing various spectra analysis, the origin of Phos is investigated, revealing luminescence mechanism of AB-CDs and the energy transfer (ET) process between the matrix and CDs. Simultaneously, tunable Phos delayed time from 2 to 7 s can be obtained at different pH. AB-CDs can also maintain a high stable Phos lifetime and intensity under the same pH over 300 h, demonstrating reversible cycling at pH value between 3 and 11. Based on the unique tunable Phos characteristic of AB-CDs, it shows potential applications in anti-counterfeiting, information encryption and recyclable pH test.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"34 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177013","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

Single-Button-Enabled Split-Modulation Transistor for Bidirectional Response in Dynamic Detection 用于动态检测中双向响应的单按钮启用分调制晶体管

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-05-29 DOI: 10.1021/acsphotonics.5c00355

Hongzhi Li, Yurong Jiang, Suicai Zhang, Leiming Yu, Xueping Li, Xiaohui Song, Congxin Xia

引用次数: 0

Simultaneously optimizing power factor and thermal conductivity of n-type PbTe 同时优化n型PbTe的功率因数和导热系数

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-05-29 DOI: 10.1063/5.0263654

Wei Hu, Tao Chen, Shenghui Wang, Hongxing Xin, Di Li, Zhulin Huang, Jian Zhang

{"title":"Simultaneously optimizing power factor and thermal conductivity of n-type PbTe","authors":"Wei Hu, Tao Chen, Shenghui Wang, Hongxing Xin, Di Li, Zhulin Huang, Jian Zhang","doi":"10.1063/5.0263654","DOIUrl":"https://doi.org/10.1063/5.0263654","url":null,"abstract":"p-type PbTe is long recognized as an outstanding thermoelectric material in the moderate temperature range, while its n-type counterpart shows relatively poor performance. To address this issue and enhance the thermoelectric properties of n-type PbTe, indium (In) was selected as the dopant to synthesize a series of Pb1−xInxTe (0.03 ≤ x ≤ 0.038) compounds, aiming to regulate the electron concentration and transport characteristics due to the simultaneous increase in electron concentration and mobility, which could be ascribed to the lattice regularization and the reduction of Pb vacancies induced by In doping. As a result, the In-doped compound Pb0.966In0.034Te demonstrated superior thermoelectric performance. Subsequently, Pb0.966In0.034Te/f-CdSe composites were fabricated, and their thermoelectric properties were systematically investigated. The results revealed that In doping significantly increased the electrical conductivity of the materials importantly, and in situ reactions between CdSe and the Pb0.966In0.034Te matrix led to the formation of coherent CdIn2Te4 nanoparticles. The presence of these nanoparticles further enhanced the power factor of the composites across the entire investigated temperature range. Moreover, the lattice thermal conductivity of the composites decreased significantly due to the effective scattering of heat-carrying phonons by point defects and nano-interfaces. Consequently, the sample Pb0.966In0.034Te + 0.7 wt. % CdSe exhibited the optimal thermoelectric performance. At 703 K, its figure of merit (ZT) reached 1.3, representing a 34% increase compared to Pb0.966In0.034Te, and the average ZT reached 0.75. These findings indicate that incorporating CdSe into Pb0.966In0.034Te is an effective strategy to improve the thermoelectric performance of n-type PbTe.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"5 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Detectable and Defect-Free Dark Photon Dark Matter 可检测和无缺陷的暗光子暗物质

IF 8.6 1区物理与天体物理

Physical review letters Pub Date : 2025-05-29 DOI: 10.1103/physrevlett.134.211002

David Cyncynates, Zachary J. Weiner

引用次数: 0

Jellyfish detection algorithm of underwater image based on TBFRNet and reinforcement learning 基于TBFRNet和强化学习的水下图像水母检测算法

IF 4.6 2区物理与天体物理

Optics and Laser Technology Pub Date : 2025-05-29 DOI: 10.1016/j.optlastec.2025.113243

Li Shiyu , Liu Zehao , Bai Yang

{"title":"Jellyfish detection algorithm of underwater image based on TBFRNet and reinforcement learning","authors":"Li Shiyu , Liu Zehao , Bai Yang","doi":"10.1016/j.optlastec.2025.113243","DOIUrl":"10.1016/j.optlastec.2025.113243","url":null,"abstract":"<div><div>This paper presents a novel deep learning-based algorithm for jellyfish target detection in underwater images, achieving recognition of 12 jellyfish species using a self-constructed dataset. Compared to terrestrial and other marine organisms, jellyfish exhibit more complex morphological features in optical imagery, posing significant challenges for detection. To overcome this difficulty, this paper initially proposes a target detection backbone network, TBFRNet, which is based on the Transformer architecture in combination with independent component analysis to enhance the accuracy of target detection at the macroscopic level. Subsequently, we design a jellyfish feature reinforcement learning detection module that aligns with human perception to improve the jellyfish feature detection outcome. A lightweight submodule is also designed to reduce computational complexity without sacrificing performance. Experiments on our jellyfish dataset demonstrate that the proposed algorithm outperforms state-of-the-art detection methods in robustness and accuracy, particularly in handling optically diverse marine environments. This work advances the application of optical image processing in marine biology and underwater surveillance.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"190 ","pages":"Article 113243"},"PeriodicalIF":4.6,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

物理与天体物理最新文献