ACS Photonics最新文献_第3页

Closed-Loop, Event-Driven Machine Learning for Autonomous Triage of Single-Photon Emitters 闭环，事件驱动的机器学习用于单光子发射器的自主导航

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-15 DOI: 10.1021/acsphotonics.6c01984

Tanvir M. Mahim, Md Nahin Islam, M. Mosaddequr Rahman, Abu S. M. Mohsin

{"title":"Closed-Loop, Event-Driven Machine Learning for Autonomous Triage of Single-Photon Emitters","authors":"Tanvir M. Mahim, Md Nahin Islam, M. Mosaddequr Rahman, Abu S. M. Mohsin","doi":"10.1021/acsphotonics.6c01984","DOIUrl":"10.1021/acsphotonics.6c01984","url":null,"abstract":"Identifying which candidate sites on a solid-state sampleare single-photonemitters requires a Hanbury Brown–Twiss (HBT) measurement ofthe second-order correlation function g(2)(τ), which is slow because photon coincidences accumulate ata rate proportional to the square of the detected count rate. We examinehow much of this time can be saved by deciding while the coincidencesare still accumulating and by adapting the exposure of each site.A spiking neural network reads the coincidence record in short timeslices and updates, after every slice, its estimate of the probabilitythat the site hosts a single emitter; a reinforcement-learning controllerdecides, site by site, whether to expose longer, certify, or reject;and a graph that encodes the electronic level structure of each emitterclass conditions one estimator on the class being measured. All componentsare trained on simulated data from a standard three-level photon-countingmodel, which we validate against the exact master-equation solutionbefore use. In simulation, the event-driven estimator reaches 90%balanced accuracy with 6 times less acquisition time than a multistartleast-squares fit, typically committing to a decision 312 ms intoa 1 s exposure, and adaptive exposure screens simulated 48-site fields1.7 times faster than fixed-dwell scanning at matched precision andrecall. Applied without retraining to published experimental HBT datafrom an InGaAs/GaAs quantum dot, a network trained only on simulatedpulsed-excitation histograms estimates g(2)(0) from 30 s records with half the error of peak-area analysis ofthe same records. The closed-loop results are obtained in simulationonly. The code, data, and trained models are openly available.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6545–6554"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210036","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

Quantum Imaging via Kurtosis-Difference Weighted Covariance on a 2D Camera 基于峭度差加权协方差的二维相机量子成像

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-23 DOI: 10.1021/acsphotonics.6c01982

Zhe He, Yanli Shi, Hui Wu, Qun Cao, Weidong Zheng, Zheng Cui

{"title":"Quantum Imaging via Kurtosis-Difference Weighted Covariance on a 2D Camera","authors":"Zhe He, Yanli Shi, Hui Wu, Qun Cao, Weidong Zheng, Zheng Cui","doi":"10.1021/acsphotonics.6c01982","DOIUrl":"10.1021/acsphotonics.6c01982","url":null,"abstract":"Camera-based quantum imaging detects spatially correlatedphotonpairs from spontaneous parametric down-conversion (SPDC). Conventionalcovariance methods typically require tens of thousands of frames toextract weak correlations from noise. While thick crystals can increasephoton flux, they generate photon pairs from multiple emission positionswithin the crystal, producing multiple correlation centers with complexpairing geometries. In addition, conventional covariance methods assumea single preselected correlation center and cannot fully exploit thesedistributed correlations. We demonstrate that kurtosis difference,a fourth-order statistic measuring tail similarity, effectively discriminatescorrelated pixel pairs even when correlation coefficients remain low.Weighting covariance by an exponential function of absolute kurtosisdifference can select symmetric pixels while preserving true coincidences.This kurtosis weighting automatically identifies correlated pairswithin a broad search region and accommodates multiple pairing geometrieswithout requiring precise correlation center calibration. At 5000frames, our method yields a contrast-to-noise ratio (CNR) exceeding7, whereas standard covariance remains below 2. Compared with standardcovariance, the method reduces the acquisition time by 40-fold andcould enable practical quantum imaging in sparse correlated-photonregimes.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6538–6544"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149241535","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

An Ultraviolet Plasmon-Enhanced Molybdenum Nanocone Field-Emission Array Cold-Cathode Electron Source 一种紫外等离子体增强钼纳米锥场发射阵列冷阴极电子源

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 DOI: 10.1021/acsphotonics.6c01824

Zhe Liu,Shaozhi Deng,Qixin Lu,Zuhui Chen,Yifeng Huang,Shuai Tang,Huanjun Chen,Juncong She,Yan Shen

{"title":"An Ultraviolet Plasmon-Enhanced Molybdenum Nanocone Field-Emission Array Cold-Cathode Electron Source","authors":"Zhe Liu,Shaozhi Deng,Qixin Lu,Zuhui Chen,Yifeng Huang,Shuai Tang,Huanjun Chen,Juncong She,Yan Shen","doi":"10.1021/acsphotonics.6c01824","DOIUrl":"https://doi.org/10.1021/acsphotonics.6c01824","url":null,"abstract":"Ultraviolet (UV) plasmon-enhanced field emission offers a route toward dynamically tunable cold-cathode electron sources operating under low-light-intensity excitation. However, cathode materials and structures that simultaneously exhibit outstanding UV plasmonic and high field-emission performance still require further development. In this study, a Mo nanocone array cold cathode is proposed and fabricated for photoelectric co-excited electron emission with UV plasmonic enhancement. The Mo nanocone array supports localized surface plasmon resonance (LSPR) in the UV region, and the high-energy electrons generated by the resonance, together with the localized near-field effect, synergistically enhance cold-cathode electron emission. Surface-enhanced Raman scattering (SERS) measurements demonstrate that the array exhibits the strongest enhancement under 325 nm excitation, supporting the wavelength-dependent optical response of the Mo nanocone array associated with its UV-LSPR characteristics. Under photoelectric co-excitation at a low light intensity on the order of W cm–2, the Mo nanocone array cold cathode achieves emission current and brightness increases of 314.2% and 300% relative to pure electric field excitation, respectively. Meanwhile, the effective work function decreases by 0.23 eV. The wavelength-dependent electron emission current agrees with the photocurrent contribution from plasmon decay-generated carriers, supporting that the enhanced electron emission originates from the designed UV plasmonic resonance. Furthermore, deep-UV plasmon-enhanced Mo nanocone arrays targeting shorter wavelengths (266 and 160 nm) are designed. This study provides a viable strategy toward developing UV plasmon-enhanced cold-cathode electron sources with tailorable emission characteristics, which presents potential for application in short-wavelength vacuum micro/nanoelectronic devices.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"11 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149359381","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-Speed Energy-Efficient Resonant Modulator on a Graphene-Organic Hybrid Platform 基于石墨烯-有机混合平台的高速节能谐振调制器

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-24 DOI: 10.1021/acsphotonics.6c00793

Xinzhi Zhang, Ping Ma, Tobias Blatter, Yannik Horst, Wolfgang Heni, Alexandros Emboras, Tatsuhiko Watanabe, Nikolaus Flöry, Lukas Novotny, Delwin L. Elder, Larry R. Dalton, Juerg Leuthold

{"title":"High-Speed Energy-Efficient Resonant Modulator on a Graphene-Organic Hybrid Platform","authors":"Xinzhi Zhang, Ping Ma, Tobias Blatter, Yannik Horst, Wolfgang Heni, Alexandros Emboras, Tatsuhiko Watanabe, Nikolaus Flöry, Lukas Novotny, Delwin L. Elder, Larry R. Dalton, Juerg Leuthold","doi":"10.1021/acsphotonics.6c00793","DOIUrl":"10.1021/acsphotonics.6c00793","url":null,"abstract":"Resonant electro-opticmodulators are of interest forencodingelectrical signals to the optical domain with an option to performsimultaneous wavelength-division multiplexing while reducing the modulationenergy consumption. Here, we demonstrate a compact, high-speed, andenergy-efficient resonant modulator exploiting the ultrafast characteristicsof graphene and organic materials, enabling efficient electro-opticmodulation on the silicon platform. Graphene, with its extraordinaryelectronic and optical properties, is used as a transparent electrodematerial that brings the radio frequency field close to the photonicmode with minimal extra losses, while the organic material providesa high linear electro-optic coefficient. This arrangement providesboth efficient light modulation in a compact device with an activelength of 50 μm and a large modulation bandwidth of ∼35GHz. High-speed data transmission experiments demonstrate a line rateof 320 Gbit/s, while a rate of 128 Gbit/s is achieved under CMOS-compatiblevoltages with energy consumption of ∼10.1 femtojoules per bit.The presented technology offers a practical and promising route towardintegration of graphene into high-speed communication links.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6339–6347"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149241537","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

Low-Insertion-Loss and Ultracompact Multicore Fiber Fan-In/Out Device Fabricated by In Situ 3D Nanoprinting 低插入损耗和超紧凑的多芯光纤风扇/输出装置制造的原位3D纳米打印

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 DOI: 10.1021/acsphotonics.6c02600

Hongfei Chen,Yaoming Feng,Hanyu Gao,Ruqi Chen,Zhenfeng Zhong,Jiying Huang,Bofan Guo,Shecheng Gao,Jiajing Tu,Zhaohui Li

{"title":"Low-Insertion-Loss and Ultracompact Multicore Fiber Fan-In/Out Device Fabricated by In Situ 3D Nanoprinting","authors":"Hongfei Chen,Yaoming Feng,Hanyu Gao,Ruqi Chen,Zhenfeng Zhong,Jiying Huang,Bofan Guo,Shecheng Gao,Jiajing Tu,Zhaohui Li","doi":"10.1021/acsphotonics.6c02600","DOIUrl":"https://doi.org/10.1021/acsphotonics.6c02600","url":null,"abstract":"Space-division multiplexing (SDM) using multicore fibers (MCFs) addresses the capacity bottleneck in single-mode fiber communications. Fan-in/fan-out (FIFO) devices interfacing MCFs with single-mode fiber arrays are essential for SDM systems, yet conventional fabrication suffers from precise alignment, complex packaging, and large footprints. We demonstrate an ultracompact, low-insertion-loss, 4-channel MCF FIFO device fabricated by in situ 3D nanoprinting via two-photon polymerization. The device monolithically integrates parabolic total internal reflection (TIR) bridge structures onto the end faces of a 4-core MCF and a single-mode fiber array, eliminating active core-to-core alignment and postfabrication assembly. The 3D structure has a height of only 60 μm and functions as a reflective 4f imaging system, ensuring diffraction-limited mode-field transfer. The FIFO exhibits a low insertion loss of ∼0.46 dB, intercore crosstalk below −50 dB at 1550 nm, and broadband operation across the S, C, and L bands. Its viability is validated through an offline 24 GBaud Dual-Polarization Quadrature Phase Shift Keying (DP-QPSK) recirculating transmission experiment over 1058.4 km (14 loops × 75.6 km) covering 186 channels, with all bit-error rates below the FEC threshold. With simple fabrication, low loss, alignment-free operation, and ultracompact footprint, this technique presents a promising and scalable solution for efficient photonic interfacing in SDM systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"81 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149359379","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

Gate-Programmable Bipolar β-Ga2O3 Solar-Blind Phototransistor for Encrypted Optical Communication and Image Transmission 用于加密光通信和图像传输的栅极可编程双极β-Ga2O3太阳盲光电晶体管

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-19 DOI: 10.1021/acsphotonics.6c01763

Wei Wang, Yushi Wang, Chenxing Liu, Zhengyuan Wu, Xin Dong, Kelvin H. L. Zhang, Ning Jia, Qinglin Sai, Hongji Qi, Daoyou Guo, Shan Li, Weihua Tang, Zhilai Fang

{"title":"Gate-Programmable Bipolar β-Ga2O3 Solar-Blind Phototransistor for Encrypted Optical Communication and Image Transmission","authors":"Wei Wang, Yushi Wang, Chenxing Liu, Zhengyuan Wu, Xin Dong, Kelvin H. L. Zhang, Ning Jia, Qinglin Sai, Hongji Qi, Daoyou Guo, Shan Li, Weihua Tang, Zhilai Fang","doi":"10.1021/acsphotonics.6c01763","DOIUrl":"10.1021/acsphotonics.6c01763","url":null,"abstract":"High-speed and reliable secure optical communicationremains challengingbecause existing bipolar photodetectors either rely on slow electrochemicalprocesses or require wavelength-selective excitation, resulting inlimited processing speed, increased system complexity, and reducedcommunication reliability. Here, we demonstrate a gate-programmablesolar-blind β-Ga2O3 phototransistor, inwhich gate-controlled reconfiguration of lateral and vertical carriertransport enables reversible switching of current polarity under onlya fixed 254 nm solar-blind illumination wavelength. The device exhibitsa responsivity of 1.73 × 104 A/W, a detectivity above1014 Jones, and a millisecond response time, outperformingmost previously reported photoelectrochemical-type and solid-statebipolar photodetectors in terms of combined sensitivity, speed, andoperational simplicity. Benefiting from the electrically programmablebipolar response, the phototransistor further realizes fast XOR logicfunctionality, enabling encrypted text communication and image encryption/decryptionunder solar-blind ultraviolet illumination. This work establishesa high-performance β-Ga2O3 optoelectronicplatform integrating solar-blind photodetection, logic operation,and information security, providing a promising hardware solutionfor next-generation secure optical communication systems.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6478–6488"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218824","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

Anomalous Quenching of Second-Harmonic Generation by Symmetry-Breaking Spin Order in CrOCl CrOCl中对称破缺自旋序产生二次谐波的反常猝灭

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-22 DOI: 10.1021/acsphotonics.6c01568

De Hou, Zhou Wang, Ying Zhang, Ruiya Zhan, Xiao Lin, Zhigao Sheng, Xinwei Li

{"title":"Anomalous Quenching of Second-Harmonic Generation by Symmetry-Breaking Spin Order in CrOCl","authors":"De Hou, Zhou Wang, Ying Zhang, Ruiya Zhan, Xiao Lin, Zhigao Sheng, Xinwei Li","doi":"10.1021/acsphotonics.6c01568","DOIUrl":"10.1021/acsphotonics.6c01568","url":null,"abstract":"Second-harmonic generation (SHG) is a sensitive opticalprobe ofsymmetry breaking because the allowed nonlinear susceptibility componentsare directly constrained by crystal and magnetic symmetry. In magneticmaterials, the onset of spin order commonly activates additional SHGchannels or redistributes intensity among polarization geometries,often producing an enhanced nonlinear response. Here we demonstratethe opposite phenomenology in the van der Waals antiferromagnet CrOCl:SHG is strongly quenched across the incommensurate and commensuratemagnetic transitions. The suppression occurs broadly across polarizationangles, in both co- and cross-polarized detection channels, and inall fitted magnetic-dipole tensor elements. By ruling out structuraldistortion, classical optical effects, and optical-resonance shiftsas dominant origins, we assign the anomalous quench to a bulk magnetic-dipoleSHG process whose radiative matrix element is reduced by reconstructionof the Cr d-orbital wave function assisted by spin–orbitcoupling. This mechanism can be understood as magnetic-order-inducedrotation of orbital pseudospin within the even-parity d manifold, revealing a novel route to nonlinear optical control thatis distinct from conventional symmetry activation.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6432–6441"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149230078","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

Bidirectional Phase Sensitivity in Holographic Phototransient Microscopy 全息光瞬态显微镜的双向相位灵敏度

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-15 DOI: 10.1021/acsphotonics.6c01684

Emmanuel Kotu Robertson, Dennis van de Lockand, Matz Liebel

{"title":"Bidirectional Phase Sensitivity in Holographic Phototransient Microscopy","authors":"Emmanuel Kotu Robertson, Dennis van de Lockand, Matz Liebel","doi":"10.1021/acsphotonics.6c01684","DOIUrl":"10.1021/acsphotonics.6c01684","url":null,"abstract":"Mid-infrared photothermal microscopy combines the chemicalspecificityof infrared absorption with the spatial resolution of visible lightdetection, but practical implementations face a persistent trade-offbetween forward-scattering (FWS) and backward-scattering (BWS) detectiongeometries. FWS provides quantitative, shape-independent phase contrastbut requires two-sided optical access, which is difficult to achievein aqueous or thick samples. BWS offers convenient single-sided access,but its signals are strongly distorted by depth-dependent interferencefor micrometer-scale objects. Here, we present a bidirectional femtosecondmid-infrared pump–probe holographic microscope capable of switchingbetween FWS and BWS geometries within a single instrument and useit to introduce and validate a new imaging modality, internal forwardscattering (IFS). IFS exploits the back reflection generated at thetop surface of the mid-infrared-transparent sample substrate as aninternally generated forward-scattering illumination wave, isolatedfrom the directly backscattered field via temporal coherence gating.Using polystyrene beads on CaF2 substrates in air, water,and a refractive-index-matched glycerol–water mixture, we showthat IFS reproduces the signal magnitudes and temporal dynamics oftrue FWS measurements while retaining the mechanical simplicity andsingle-sided accessibility of BWS. These results establish IFS asa practical, quantitative alternative to conventional FWS and BWSgeometries for photothermal and, more broadly, quantitative phaseimaging, with direct relevance to single-sided imaging of biologicalor solvent-contained specimens.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6460–6466"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210033","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

Mid-Infrared All-Optical Wavelength Conversion of NRZ OOK Signal in Silicon Waveguides 硅波导中nrz OOK信号的中红外全光波长转换

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-15 DOI: 10.1021/acsphotonics.6c00289

Zhiwei Yan, Chang Chang, Xuchen Peng, Guanglian Cheng, Qiyuan Yi, Xinzhe Xiong, Qiyuan Li, Zengfan Shen, Shuang Zheng, Yi Zou, Minming Zhang, Li Shen

{"title":"Mid-Infrared All-Optical Wavelength Conversion of NRZ OOK Signal in Silicon Waveguides","authors":"Zhiwei Yan, Chang Chang, Xuchen Peng, Guanglian Cheng, Qiyuan Yi, Xinzhe Xiong, Qiyuan Li, Zengfan Shen, Shuang Zheng, Yi Zou, Minming Zhang, Li Shen","doi":"10.1021/acsphotonics.6c00289","DOIUrl":"10.1021/acsphotonics.6c00289","url":null,"abstract":"The escalating demand for data traffic is driving thepursuit ofnew wavelength bands beyond the conventional telecom windows as akey expansion strategy. The 2 μm waveband is considered a novelcommunication window with distinct advantages of lower signal lossand broader gain bandwidth. Meanwhile, wavelength conversion is acritical enabler for the next-generation high-speed all-optical networks.In this work, we demonstrate, for the first time, all-optical wavelengthconversion of high-speed nonreturn-to-zero on–off keying signalsin the 2 μm waveband via four-wave mixing, employing a continuous-wavepump and silicon waveguides fabricated on a standard 340 nm silicon-on-insulatorplatform. A high conversion efficiency of −12.09 dB is achievedwith an input pump power of 21.72 dBm. Facilitated by a pump lasercentered at 2008 nm, broadband wavelength conversion is experimentallydemonstrated over a conversion span of 314.9 nm. Moreover, wavelengthconversion of 10 Gbit/s and 15 Gbit/s data signals is successfullydemonstrated, with respective power penalties of 2.56 and 3.95 dBmeasured at a bit error ratio of 3.8 × 10–3. The promise of the demonstrated mid-infrared wavelength converterfor future chip-scale high-speed optical communication is supportedby the experimental results.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6313–6321"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149210035","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

Quantum Barrier Engineering Enables Carrier Redistribution for High-Efficiency Green InGaN Micro-LEDs at Reduced Operating Current Density 量子势垒工程可实现低电流密度下高效绿色InGaN微型led的载流子重分配

IF 6 1区物理与天体物理

ACS Photonics Pub Date : 2026-11-04 Epub Date: 2026-10-21 DOI: 10.1021/acsphotonics.6c01862

Chunyu Liu, Weifang Lu, Xu Yang, Yizhan Lin, Jinchai Li, Kai Huang, Zhaoxia Bi, Rong Zhang

{"title":"Quantum Barrier Engineering Enables Carrier Redistribution for High-Efficiency Green InGaN Micro-LEDs at Reduced Operating Current Density","authors":"Chunyu Liu, Weifang Lu, Xu Yang, Yizhan Lin, Jinchai Li, Kai Huang, Zhaoxia Bi, Rong Zhang","doi":"10.1021/acsphotonics.6c01862","DOIUrl":"10.1021/acsphotonics.6c01862","url":null,"abstract":"Achievinghigh efficiency in green InGaN microlight-emitting diodes(Micro-LEDs) at low current densities required for active-matrix microdisplaysis fundamentally limited by inefficient hole transport and nonuniformcarrier distribution in multiple quantum wells (MQWs). Here, we systematicallyinvestigate the influence of quantum barrier (QB) thickness and thenumber of MQW periods on the low-current performance of green Micro-LEDs.Increasing the QB thickness from 10 to 25 nm significantly improvesthe MQW interface quality and enhances the peak wall-plug efficiency(WPE) to 52.4% at an ultralow current density of 0.42 A·cm–2, corresponding to a peak external quantum efficiencyof 48.1%. Carrier transport analysis reveals that thicker QBs suppressinterwell hole transport, promote carrier localization within theradiatively active quantum wells near the p-side, and enhance electron–holeoverlap, thereby reducing Shockley-Read-Hall (SRH) recombination andshifting the transition from SRH to radiative-dominated recombinationfrom 5.71 to 1.87 A·cm–2. Furthermore, optimizationof the MQW period number identifies a five-period active region thatmaximizes carrier utilization while maintaining sufficient effectiverecombination volume. These results establish a unified active-regiondesign principle in which QB engineering controls the number of effectivelyradiative quantum wells, enabling MQWs to be optimized for high-efficiencyIII-nitride Micro-LEDs operating under display-relevant low-currentconditions.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"13 21","pages":"6510–6520"},"PeriodicalIF":6.0,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149226037","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