ACS Photonics最新文献_第8页

Distinctness of Electroluminescence and Optical Gain in Laser Diodes with Wide Polar Quantum Wells

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-06 DOI: 10.1021/acsphotonics.4c0219310.1021/acsphotonics.4c02193

Mateusz Hajdel*, Krzysztof Gołyga, Marcin Siekacz, Anna Feduniewicz-Żmuda, Czesław Skierbiszewski, Ulrich Theodor Schwarz and Grzegorz Muziol,

{"title":"Distinctness of Electroluminescence and Optical Gain in Laser Diodes with Wide Polar Quantum Wells","authors":"Mateusz Hajdel*, Krzysztof Gołyga, Marcin Siekacz, Anna Feduniewicz-Żmuda, Czesław Skierbiszewski, Ulrich Theodor Schwarz and Grzegorz Muziol, ","doi":"10.1021/acsphotonics.4c0219310.1021/acsphotonics.4c02193","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02193https://doi.org/10.1021/acsphotonics.4c02193","url":null,"abstract":"Despite the ubiquity of semiconductor-based emitters in optoelectronic devices we use every day, obstacles still remain to unlock their full potential. One of these lies in long-wavelength GaN-based laser diodes (LDs). It is common knowledge that InGaN quantum wells (QWs) exhibit extremely large built-in polarization, which helps to obtain long-wavelength emission in light-emitting diodes, thanks to the large quantum-confined Stark effect. However, in this paper, it is shown that in order to achieve long-wavelength LDs, wide InGaN QWs might be preferential. The lasing wavelength for blue LDs can be even 20 nm longer in the case of wide QWs than in thin QWs for the same composition. The mechanisms behind these effects are explored by analyzing evolution of spontaneous emission, amplified spontaneous emission, optical gain, and quasi-Fermi level separation. It is shown that in wide QWs, the spontaneous emission originates from highly excited states. However, as the carrier density increases, quantum states with lower energy take over. Furthermore, population inversion, and thus lasing action, is obtained from the lowest excited states, resulting in long-wavelength lasing. The reported effects should also be observed in other polar materials with sufficiently thick QWs.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 3","pages":"1515–1523 1515–1523"},"PeriodicalIF":6.5,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c02193","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641498","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

Opportunities and Challenges in Quantum-Enhanced Optical Target Detection

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-06 DOI: 10.1021/acsphotonics.4c0179910.1021/acsphotonics.4c01799

Han Liu, and , Amr S. Helmy*,

{"title":"Opportunities and Challenges in Quantum-Enhanced Optical Target Detection","authors":"Han Liu,  and , Amr S. Helmy*, ","doi":"10.1021/acsphotonics.4c0179910.1021/acsphotonics.4c01799","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01799https://doi.org/10.1021/acsphotonics.4c01799","url":null,"abstract":"The goal of optical target detection is to identify the presence or absence of a target object by using light or photons as the transmitter. This technique offers significant advantages, such as high resolution and precise directionality, and plays a key role in applications like LiDAR. One of the critical performance metrics in optical target detection is noise resilience─specifically, the system’s ability to distinguish reflected signals from crosstalk or jamming sources with similar optical properties. Traditionally, this challenge has been addressed through classical information processing or standard optical filtering methods. However, a new approach to improving noise resilience has recently captured the attention of numerous researchers: harnessing the unique properties of quantum light sources. These sources offer performance enhancements that are challenging or even impossible to achieve with conventional coherent optical sources. In this perspective, we examine the performance and limitations of this emerging method, including challenges related to receiver complexity and power scaling. We also explore potential strategies to overcome these limitations, highlighting the practical advantages these approaches could offer.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 3","pages":"1256–1258 1256–1258"},"PeriodicalIF":6.5,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641490","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

Opportunities and Challenges in Quantum-Enhanced Optical Target Detection

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-06 DOI: 10.1021/acsphotonics.4c01799

Han Liu, Amr S. Helmy

{"title":"Opportunities and Challenges in Quantum-Enhanced Optical Target Detection","authors":"Han Liu, Amr S. Helmy","doi":"10.1021/acsphotonics.4c01799","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01799","url":null,"abstract":"The goal of optical target detection is to identify the presence or absence of a target object by using light or photons as the transmitter. This technique offers significant advantages, such as high resolution and precise directionality, and plays a key role in applications like LiDAR. One of the critical performance metrics in optical target detection is noise resilience─specifically, the system’s ability to distinguish reflected signals from crosstalk or jamming sources with similar optical properties. Traditionally, this challenge has been addressed through classical information processing or standard optical filtering methods. However, a new approach to improving noise resilience has recently captured the attention of numerous researchers: harnessing the unique properties of quantum light sources. These sources offer performance enhancements that are challenging or even impossible to achieve with conventional coherent optical sources. In this perspective, we examine the performance and limitations of this emerging method, including challenges related to receiver complexity and power scaling. We also explore potential strategies to overcome these limitations, highlighting the practical advantages these approaches could offer.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"4 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560842","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

A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-06 DOI: 10.1021/acsphotonics.4c02076

Kristen M. Parzuchowski, Michael D. Mazurek, Charles H. Camp, Jr., Martin J. Stevens, Ralph Jimenez

{"title":"A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements","authors":"Kristen M. Parzuchowski, Michael D. Mazurek, Charles H. Camp, Jr., Martin J. Stevens, Ralph Jimenez","doi":"10.1021/acsphotonics.4c02076","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02076","url":null,"abstract":"We introduce a toluene-filled fiber platform for two-photon absorption measurements. By confining both the light and molecular sample inside the 5 μm hollow core of the fiber, we increase the distance over which the nonlinear light–matter interaction occurs. With only a 7.3 nL excitation volume, we measure classical two-photon absorption (C2PA) at an average laser power as low as 1.75 nW, which is a 45-fold improvement over a conventional free-space technique. We use this platform to attempt to measure entangled two-photon absorption (E2PA), a process with a limited regime where the quantum advantage is large. This regime arises due to a crossover from linear to quadratic scaling with photon flux as photon flux is increased. Recently, several teams of researchers have reported that E2PA cross-sections are much smaller than previously claimed. As a result, the linear scaling dominates at photon fluxes so low that it is extremely difficult or impossible to measure using conventional free-space techniques. In this report, we implement the first E2PA measurement using a waveguide. We see no evidence of E2PA, and we set an upper bound on the cross-section consistent with these recent reports.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"14 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143569965","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

A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-06 DOI: 10.1021/acsphotonics.4c0207610.1021/acsphotonics.4c02076

Kristen M. Parzuchowski*, Michael D. Mazurek, Charles H. Camp Jr., Martin J. Stevens and Ralph Jimenez*,

{"title":"A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements","authors":"Kristen M. Parzuchowski*, Michael D. Mazurek, Charles H. Camp Jr., Martin J. Stevens and Ralph Jimenez*, ","doi":"10.1021/acsphotonics.4c0207610.1021/acsphotonics.4c02076","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02076https://doi.org/10.1021/acsphotonics.4c02076","url":null,"abstract":"We introduce a toluene-filled fiber platform for two-photon absorption measurements. By confining both the light and molecular sample inside the 5 μm hollow core of the fiber, we increase the distance over which the nonlinear light–matter interaction occurs. With only a 7.3 nL excitation volume, we measure classical two-photon absorption (C2PA) at an average laser power as low as 1.75 nW, which is a 45-fold improvement over a conventional free-space technique. We use this platform to attempt to measure entangled two-photon absorption (E2PA), a process with a limited regime where the quantum advantage is large. This regime arises due to a crossover from linear to quadratic scaling with photon flux as photon flux is increased. Recently, several teams of researchers have reported that E2PA cross-sections are much smaller than previously claimed. As a result, the linear scaling dominates at photon fluxes so low that it is extremely difficult or impossible to measure using conventional free-space techniques. In this report, we implement the first E2PA measurement using a waveguide. We see no evidence of E2PA, and we set an upper bound on the cross-section consistent with these recent reports.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 3","pages":"1470–1479 1470–1479"},"PeriodicalIF":6.5,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c02076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641495","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

Ultra-Wideband Tunable Thin-Film Lithium-Niobate-on-Insulator Microwave Photonic Filter

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-05 DOI: 10.1021/acsphotonics.5c00056

Yiwei Xie, Hao Yan, Zexu Wang, Shihan Hong, Liu Liu, Hongqi Zhang, Long Zhang, Lu Zhang, Ke Wang, Daoxin Dai

引用次数: 0

Transient Absorption Microscopy for Early-Stage Imaging of Protein Aggregates Using Thioflavin T

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-05 DOI: 10.1021/acsphotonics.4c0190010.1021/acsphotonics.4c01900

Przemyslaw Slota, and , Piotr Fita*,

{"title":"Transient Absorption Microscopy for Early-Stage Imaging of Protein Aggregates Using Thioflavin T","authors":"Przemyslaw Slota,  and , Piotr Fita*, ","doi":"10.1021/acsphotonics.4c0190010.1021/acsphotonics.4c01900","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01900https://doi.org/10.1021/acsphotonics.4c01900","url":null,"abstract":"We present the design and application of a transient absorption microscope for imaging protein aggregates at early stages of growth, utilizing the widely used amyloid marker dye Thioflavin T (ThT). By employing femtosecond laser pulses for excitation and probing, the microscope distinguishes signals from free ThT molecules and ThT bound to protein aggregates, enabling the imaging of aggregates at different stages of development. Spatially resolved transient absorption measurements revealed two distinct excited-state lifetimes for ThT in the presence of insulin aggregates: a short lifetime (approximately 10 ps) and a longer lifetime (in the range of 100–200 ps). The short lifetime dominates at early stages of aggregation, reflecting ThT binding to small, disordered aggregates or amorphous precursors. As aggregation progresses, the contribution of the longer lifetime increases, corresponding to the formation of larger, more ordered structures. This observation agrees with theoretical models of amyloid formation, where early aggregates serve as nucleation sites for the growth of mature fibrils. The results demonstrate the capability of transient absorption microscopy to resolve spatial and temporal dynamics of protein aggregation. This approach offers potential applications in the study of amyloid-related diseases, including the characterization of aggregation inhibitors and imaging of pathological protein deposits in tissue samples.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 3","pages":"1392–1401 1392–1401"},"PeriodicalIF":6.5,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c01900","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641223","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

Transient Absorption Microscopy for Early-Stage Imaging of Protein Aggregates Using Thioflavin T

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-05 DOI: 10.1021/acsphotonics.4c01900

Przemyslaw Slota, Piotr Fita

{"title":"Transient Absorption Microscopy for Early-Stage Imaging of Protein Aggregates Using Thioflavin T","authors":"Przemyslaw Slota, Piotr Fita","doi":"10.1021/acsphotonics.4c01900","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01900","url":null,"abstract":"We present the design and application of a transient absorption microscope for imaging protein aggregates at early stages of growth, utilizing the widely used amyloid marker dye Thioflavin T (ThT). By employing femtosecond laser pulses for excitation and probing, the microscope distinguishes signals from free ThT molecules and ThT bound to protein aggregates, enabling the imaging of aggregates at different stages of development. Spatially resolved transient absorption measurements revealed two distinct excited-state lifetimes for ThT in the presence of insulin aggregates: a short lifetime (approximately 10 ps) and a longer lifetime (in the range of 100–200 ps). The short lifetime dominates at early stages of aggregation, reflecting ThT binding to small, disordered aggregates or amorphous precursors. As aggregation progresses, the contribution of the longer lifetime increases, corresponding to the formation of larger, more ordered structures. This observation agrees with theoretical models of amyloid formation, where early aggregates serve as nucleation sites for the growth of mature fibrils. The results demonstrate the capability of transient absorption microscopy to resolve spatial and temporal dynamics of protein aggregation. This approach offers potential applications in the study of amyloid-related diseases, including the characterization of aggregation inhibitors and imaging of pathological protein deposits in tissue samples.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"86 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546976","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

Ultra-Wideband Tunable Thin-Film Lithium-Niobate-on-Insulator Microwave Photonic Filter

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-05 DOI: 10.1021/acsphotonics.5c0005610.1021/acsphotonics.5c00056

Yiwei Xie, Hao Yan, Zexu Wang, Shihan Hong, Liu Liu, Hongqi Zhang, Long Zhang, Lu Zhang*, Ke Wang and Daoxin Dai*,

引用次数: 0

Optical Multimode Tensor Processor on TFLN Platform 基于 TFLN 平台的光学多模张量处理器

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-03-04 DOI: 10.1021/acsphotonics.4c02212

Yang Gao, Lin Wang, Wenting Jiao, Xinyu Huang, Lei Zhang, Yue Hong, Haitao Wang, Hongli Zhu, Kun Yin, Hui Yu

引用次数: 0