Minna Zhang, Hao Wu, Xuri Yao, Jiyang Ma, Mark Oxborrow, Qing Zhao
Crystal defects in solid-state spintronic materials play a crucial role in altering the optical properties of their hosts, enabling widespread applications in the field of quantum information processing. While the majority of the leading platforms are inorganic, they come with limitations such as the challenging material preparations and insufficient amount of active spins. Here, pentacene-doped p-terphenyl (Pc:Ptp), an organic spintronic material with easy preparations and tailorable functionalities normally used for microwave quantum electronics, is demonstrated for the first time its ability of self-cavity laser emission at room temperature. The laser emission is characterized by strong polarization and anisotropy, attributed to the unique packing of the doped molecules (i.e., active spins) within the crystal. The optical coherence is found to be a figure of merit to distinguish the processes of the amplified spontaneous emission (ASE) and lasing in Pc:Ptp. This work highlights the potential of Pc:Ptp as a compact and efficient platform for light-matter interactions, offering significant promise for enhancing the performance of solid-state quantum devices based on the organic spintronic material.
{"title":"Room-Temperature Self-Cavity Lasing From Organic Spintronic Materials","authors":"Minna Zhang, Hao Wu, Xuri Yao, Jiyang Ma, Mark Oxborrow, Qing Zhao","doi":"10.1002/lpor.202401820","DOIUrl":"https://doi.org/10.1002/lpor.202401820","url":null,"abstract":"Crystal defects in solid-state spintronic materials play a crucial role in altering the optical properties of their hosts, enabling widespread applications in the field of quantum information processing. While the majority of the leading platforms are inorganic, they come with limitations such as the challenging material preparations and insufficient amount of active spins. Here, pentacene-doped <i>p</i>-terphenyl (Pc:Ptp), an organic spintronic material with easy preparations and tailorable functionalities normally used for microwave quantum electronics, is demonstrated for the first time its ability of self-cavity laser emission at room temperature. The laser emission is characterized by strong polarization and anisotropy, attributed to the unique packing of the doped molecules (i.e., active spins) within the crystal. The optical coherence is found to be a figure of merit to distinguish the processes of the amplified spontaneous emission (ASE) and lasing in Pc:Ptp. This work highlights the potential of Pc:Ptp as a compact and efficient platform for light-matter interactions, offering significant promise for enhancing the performance of solid-state quantum devices based on the organic spintronic material.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"49 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990575","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}
Li Wang, Zeng‐Quan Yan, Ze‐Kun Jiang, Zheng Zhang, Xiao‐Wei Wang, Wen‐Hao Zhou, Xian‐Min Jin
3D imaging using single‐photon time‐of‐flight (ToF) detection has emerged as a potential solution for sensing in challenging scenarios. However, most schemes require strict synchronization between the illuminating light transmitter and the detector, which greatly limits their practicality and flexibility. Here, a synchronization‐free single‐photon 3D imaging scheme that exploits only binary‐encoded illumination light and a photon time‐stamping high‐speed detection system are proposed. The correlation between the arrival times of photons detected by individual pixels is utilized to achieve clock synchronization, and further calculate the ToF differences of photons detected by different pixels to extract the depth information of the imaging target. This scheme can adapt to conditions with signals as weak as photons per pulse per pixel. This work provides a simple, flexible method for realizing 3D imaging in long‐range and high‐loss scenes, paving the way for future applications in large‐scale, high‐complexity real‐world scenarios.
{"title":"Synchronization‐Free Single‐Photon 3D Imaging","authors":"Li Wang, Zeng‐Quan Yan, Ze‐Kun Jiang, Zheng Zhang, Xiao‐Wei Wang, Wen‐Hao Zhou, Xian‐Min Jin","doi":"10.1002/lpor.202401436","DOIUrl":"https://doi.org/10.1002/lpor.202401436","url":null,"abstract":"3D imaging using single‐photon time‐of‐flight (ToF) detection has emerged as a potential solution for sensing in challenging scenarios. However, most schemes require strict synchronization between the illuminating light transmitter and the detector, which greatly limits their practicality and flexibility. Here, a synchronization‐free single‐photon 3D imaging scheme that exploits only binary‐encoded illumination light and a photon time‐stamping high‐speed detection system are proposed. The correlation between the arrival times of photons detected by individual pixels is utilized to achieve clock synchronization, and further calculate the ToF differences of photons detected by different pixels to extract the depth information of the imaging target. This scheme can adapt to conditions with signals as weak as photons per pulse per pixel. This work provides a simple, flexible method for realizing 3D imaging in long‐range and high‐loss scenes, paving the way for future applications in large‐scale, high‐complexity real‐world scenarios.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"74 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989914","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}
Perovskite materials, known for their exceptional photoelectronic and photonic properties, have attracted considerable interest in the field of nonlinear optics (NLO). Herein, 0D organic–inorganic hybrid bismuth perovskite (PPA)<sub>3</sub>BiI<sub>6</sub> (PPA = 3-phenyl-2-propen-1-ammonium) is successfully synthesized using the cooling-induced crystallization method. The nonlinear optical responses of this hybrid bismuth halide are investigated within the visible spectrum range of 405–532 nm by the spatial self-phase modulation (SSPM) method. It is found that (PPA)<sub>3</sub>BiI<sub>6</sub> exhibits excellent third-order nonlinear susceptibilities (<span data-altimg="/cms/asset/8354ce98-b5e8-4cd0-b5fb-9641e9e71b3c/lpor202401929-math-0001.png"></span><mjx-container ctxtmenu_counter="1" ctxtmenu_oldtabindex="1" jax="CHTML" role="application" sre-explorer- style="font-size: 103%; position: relative;" tabindex="0"><mjx-math aria-hidden="true" location="graphic/lpor202401929-math-0001.png"><mjx-semantics><mjx-msubsup data-semantic-children="0,1,5" data-semantic-collapsed="(7 (6 0 1) 5)" data-semantic- data-semantic-role="greekletter" data-semantic-speech="chi Subscript m o n o l a y e r Superscript left parenthesis 3 right parenthesis" data-semantic-type="subsup"><mjx-mi data-semantic-annotation="clearspeak:simple" data-semantic-font="italic" data-semantic- data-semantic-parent="7" data-semantic-role="greekletter" data-semantic-type="identifier"><mjx-c></mjx-c></mjx-mi><mjx-script style="vertical-align: -0.317em; margin-left: 0px;"><mjx-mrow data-semantic-children="3" data-semantic-content="2,4" data-semantic- data-semantic-parent="7" data-semantic-role="leftright" data-semantic-type="fenced" size="s"><mjx-mo data-semantic- data-semantic-operator="fenced" data-semantic-parent="5" data-semantic-role="open" data-semantic-type="fence"><mjx-c></mjx-c></mjx-mo><mjx-mn data-semantic-annotation="clearspeak:simple" data-semantic-font="normal" data-semantic- data-semantic-parent="5" data-semantic-role="integer" data-semantic-type="number"><mjx-c></mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator="fenced" data-semantic-parent="5" data-semantic-role="close" data-semantic-type="fence"><mjx-c></mjx-c></mjx-mo></mjx-mrow><mjx-spacer style="margin-top: 0.18em;"></mjx-spacer><mjx-mi data-semantic-font="normal" data-semantic- data-semantic-parent="7" data-semantic-role="unknown" data-semantic-type="identifier" size="s"><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c><mjx-c></mjx-c></mjx-mi></mjx-script></mjx-msubsup></mjx-semantics></mjx-math><mjx-assistive-mml display="inline" unselectable="on"><math altimg="urn:x-wiley:18638880:media:lpor202401929:lpor202401929-math-0001" display="inline" location="graphic/lpor202401929-math-0001.png" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><msubsup data-semantic-="" data-semantic-children="0,1,5" data-semantic-collapsed="(7 (6 0 1) 5
Xiutao Yang, Jun Gou, Hang Yu, Lixin Liu, Chunyu Li, Laijiang Wei, Yuchao Wei, ZeXu Wang, Meiyu He, Xin Zhang, Guanggen Zeng, Jiayue Han, He Yu, Zhiming Wu, Yadong Jiang, Jun Wang
The prevailing short-wavelength infrared (SWIR) photodetectors (PDs) based on III-V materials face challenges in heteroepitaxial material growth and device fabrication which adds cost and complexity. SeTe alloy is a potential candidate for SWIR PDs due to its low-cost growth and adjustable bandgap. However, the performance of SeTe-based PDs is currently hindered by the narrow depletion region and high dark current. Herein, large-scale, high-quality Se0.3Te0.7 thin film is fabricated through a CMOS-compatible magnetron sputtering method followed by a low-temperature annealing process. A Si/Se0.3Te0.7/ITO vertical heterostructure is constructed with enhanced performances induced by an internal photoemission effect of top Schottky diode, which significantly increases carriers injected into Se0.3Te0.7 and transported by Si/Se0.3Te0.7 heterojunction. The PD shows superior broadband photoelectric properties with a 10000% improved responsivity at 1310 and 1550 nm, and a response time of ≈20 µs over a wide spectral range which represents a 100-fold reduction compared to traditional devices in the absence of hot holes trapping mechanism. This pioneering research provides fresh avenues for significantly improving the optoelectronic performance of analogous devices with narrow depletion regions in photosensitive materials and showcases potential applications in Si-based broadband detection and imaging systems with high sensitivity and high speed at room temperature.
{"title":"High-Speed and Broadband n-Si/p-Se0.3Te0.7/ITO Heterojunction Photodetector","authors":"Xiutao Yang, Jun Gou, Hang Yu, Lixin Liu, Chunyu Li, Laijiang Wei, Yuchao Wei, ZeXu Wang, Meiyu He, Xin Zhang, Guanggen Zeng, Jiayue Han, He Yu, Zhiming Wu, Yadong Jiang, Jun Wang","doi":"10.1002/lpor.202402069","DOIUrl":"https://doi.org/10.1002/lpor.202402069","url":null,"abstract":"The prevailing short-wavelength infrared (SWIR) photodetectors (PDs) based on III-V materials face challenges in heteroepitaxial material growth and device fabrication which adds cost and complexity. SeTe alloy is a potential candidate for SWIR PDs due to its low-cost growth and adjustable bandgap. However, the performance of SeTe-based PDs is currently hindered by the narrow depletion region and high dark current. Herein, large-scale, high-quality Se<sub>0.3</sub>Te<sub>0.7</sub> thin film is fabricated through a CMOS-compatible magnetron sputtering method followed by a low-temperature annealing process. A Si/Se<sub>0.3</sub>Te<sub>0.7</sub>/ITO vertical heterostructure is constructed with enhanced performances induced by an internal photoemission effect of top Schottky diode, which significantly increases carriers injected into Se<sub>0.3</sub>Te<sub>0.7</sub> and transported by Si/Se<sub>0.3</sub>Te<sub>0.7</sub> heterojunction. The PD shows superior broadband photoelectric properties with a 10000% improved responsivity at 1310 and 1550 nm, and a response time of ≈20 µs over a wide spectral range which represents a 100-fold reduction compared to traditional devices in the absence of hot holes trapping mechanism. This pioneering research provides fresh avenues for significantly improving the optoelectronic performance of analogous devices with narrow depletion regions in photosensitive materials and showcases potential applications in Si-based broadband detection and imaging systems with high sensitivity and high speed at room temperature.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"45 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987815","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}
Danyi Weng, Cheng Ling, Yang Gao, Guanghao Rui, Li Fan, Qiannan Cui, Chunxiang Xu, Bing Gu
Molybdenum phosphide (MoP) has excellent catalytic activity in hydrogen evolution reactions, but research on its nonlinear optical properties is just beginning. In this work, the spatial self-phase modulation (SSPM) phenomena of semimetal MoP spherical microparticles are investigated, their applications in spatially asymmetric optical propagation and all-optical switching are developed. The effective nonlinear refractive index n2 of MoP microparticles and the ring formation time τF of SSPM are measured to be about 10−5 cm2 W−1 and 0.4 s, respectively. The SSPM experimental results after the sample placed for over two months indicate that MoP microparticles have long-term stability and resistance to photodegradation. The physical origin of the interaction between light and MoP microparticles to form SSPM is dominated by laser-induced hole coherence and a small amount of thermal effect. By utilizing the superior optical nonlinearity of MoP microparticles, the spatially asymmetric optical propagation of MoP/violet phosphorus (VP) cascaded samples and the all-optical switching performance of MoP microparticles are demonstrated, respectively. These results deepen the understanding of the optical nonlinear mechanism of hole micromaterials and are beneficial for the development of SSPM based on topological semimetal micro/nano-materials in passive nonlinear photonic devices, such as all-optical diodes, optical isolators, optical logic gates, etc.
{"title":"Spatially Asymmetric Optical Propagation and All-Optical Switching Based on Spatial Self-Phase Modulation of Semimetal MoP Microparticles","authors":"Danyi Weng, Cheng Ling, Yang Gao, Guanghao Rui, Li Fan, Qiannan Cui, Chunxiang Xu, Bing Gu","doi":"10.1002/lpor.202401587","DOIUrl":"https://doi.org/10.1002/lpor.202401587","url":null,"abstract":"Molybdenum phosphide (MoP) has excellent catalytic activity in hydrogen evolution reactions, but research on its nonlinear optical properties is just beginning. In this work, the spatial self-phase modulation (SSPM) phenomena of semimetal MoP spherical microparticles are investigated, their applications in spatially asymmetric optical propagation and all-optical switching are developed. The effective nonlinear refractive index <i>n</i><sub>2</sub> of MoP microparticles and the ring formation time <i>τ<sub>F</sub></i> of SSPM are measured to be about 10<sup>−5</sup> cm<sup>2</sup> W<sup>−1</sup> and 0.4 s, respectively. The SSPM experimental results after the sample placed for over two months indicate that MoP microparticles have long-term stability and resistance to photodegradation. The physical origin of the interaction between light and MoP microparticles to form SSPM is dominated by laser-induced hole coherence and a small amount of thermal effect. By utilizing the superior optical nonlinearity of MoP microparticles, the spatially asymmetric optical propagation of MoP/violet phosphorus (VP) cascaded samples and the all-optical switching performance of MoP microparticles are demonstrated, respectively. These results deepen the understanding of the optical nonlinear mechanism of hole micromaterials and are beneficial for the development of SSPM based on topological semimetal micro/nano-materials in passive nonlinear photonic devices, such as all-optical diodes, optical isolators, optical logic gates, etc.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"96 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987816","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}
Jiaxian Zhao, Min Wang, Shuang-Yin Huang, Yu Ge, Chenghou Tu, Yongnan Li, Hui-Tian Wang
High-dimensional (HD) entanglement of photonic orbital angular momentum (OAM) offers significant potential for enhancing channel capacity and improving noise resistance in quantum information processing. However, the challenge of achieving simple and rapid measurement has limited its practical applications. In this work, a quantum state tomography (QST) framework is demonstrated that utilizes convolutional neural networks to rapidly reconstruct the density matrix of OAM entanglement from only two coincidence measurements. The experimental results for a 5D OAM entangled state yield a fidelity of 0.973 ± 0.005. This method is also applicable to mixed OAM entangled states and scenarios with incomplete tomographic measurements. These findings represent a significant step toward implementing high-speed QST for applications involving HD spatial mode quantum state, whether in free space or integrated systems.
{"title":"Efficient Measurement of Orbital Angular Momentum Entanglement Using Convolutional Neural Network","authors":"Jiaxian Zhao, Min Wang, Shuang-Yin Huang, Yu Ge, Chenghou Tu, Yongnan Li, Hui-Tian Wang","doi":"10.1002/lpor.202400720","DOIUrl":"https://doi.org/10.1002/lpor.202400720","url":null,"abstract":"High-dimensional (HD) entanglement of photonic orbital angular momentum (OAM) offers significant potential for enhancing channel capacity and improving noise resistance in quantum information processing. However, the challenge of achieving simple and rapid measurement has limited its practical applications. In this work, a quantum state tomography (QST) framework is demonstrated that utilizes convolutional neural networks to rapidly reconstruct the density matrix of OAM entanglement from only two coincidence measurements. The experimental results for a 5D OAM entangled state yield a fidelity of 0.973 ± 0.005. This method is also applicable to mixed OAM entangled states and scenarios with incomplete tomographic measurements. These findings represent a significant step toward implementing high-speed QST for applications involving HD spatial mode quantum state, whether in free space or integrated systems.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"68 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987814","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}
Chiral metasurfaces, featuring customizable chiroptical response, have shown great potential across diverse applications, including optical sensing, chiral emission, and light spin detection. However, most previous studies have focused on chiroptical response stemming from the resonance of nanoresonators or their coupling. Here, the great capability of controlling nonlocal resonance for achieving versatile manipulation of circular dichroism (CD) is demonstrated. A counterintuitive sign reversal of CD is realized by modulating the collective interference of the plasmonic guided mode resonances (GMRs) within diatomic metasurfaces. The designed metasurfaces, composed of two nanoresonators, can effectively couple both orthogonal linear-polarized components of circularly polarized light to the same GMR. Through a simple adjustment of the spacing of nanoresonators to modulate the interference between GMRs, continuous variation and sign reversal of CD are achieved. Importantly, due to the fact that the modulation of GMRs does not impact the chiral resonant modes of the nanoresonators, the significant advantages of the designed metasurfaces in achieving chiral optical encryption are experimentally demonstrated. This work introduces an effective approach for the continuous manipulation of CD without altering the structural geometric chirality. It provides novel insights into exploring chiroptical mechanisms and holds promise for applications in chiral sensing and light spin detection.
{"title":"Counterintuitive Reversal of Circular Dichroism via Controllable Plasmonic Guided Mode Resonance in Diatomic Metasurfaces","authors":"Jiaqi Cheng, Zhancheng Li, Duk-Yong Choi, Wenwei Liu, Yuebian Zhang, Shiwang Yu, Hua Cheng, Jianguo Tian, Shuqi Chen","doi":"10.1002/lpor.202401184","DOIUrl":"https://doi.org/10.1002/lpor.202401184","url":null,"abstract":"Chiral metasurfaces, featuring customizable chiroptical response, have shown great potential across diverse applications, including optical sensing, chiral emission, and light spin detection. However, most previous studies have focused on chiroptical response stemming from the resonance of nanoresonators or their coupling. Here, the great capability of controlling nonlocal resonance for achieving versatile manipulation of circular dichroism (CD) is demonstrated. A counterintuitive sign reversal of CD is realized by modulating the collective interference of the plasmonic guided mode resonances (GMRs) within diatomic metasurfaces. The designed metasurfaces, composed of two nanoresonators, can effectively couple both orthogonal linear-polarized components of circularly polarized light to the same GMR. Through a simple adjustment of the spacing of nanoresonators to modulate the interference between GMRs, continuous variation and sign reversal of CD are achieved. Importantly, due to the fact that the modulation of GMRs does not impact the chiral resonant modes of the nanoresonators, the significant advantages of the designed metasurfaces in achieving chiral optical encryption are experimentally demonstrated. This work introduces an effective approach for the continuous manipulation of CD without altering the structural geometric chirality. It provides novel insights into exploring chiroptical mechanisms and holds promise for applications in chiral sensing and light spin detection.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"97 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142988355","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}
Zeyu Miao, Jie Guo, Dan Jiang, Weijia Zheng, Wenxu Yin, Zhao Luo, Xinyan Zhou, Zhou Jiang, Wei Zhang, Xiuyun Zhang, Cong Chen, Xingliang Dai, Qingfeng Dong, Xuyong Yang, Ning Wang, Tom Wu, Xiaoyu Zhang, Jiaqi Zhang
Tin (Sn)-based perovskites have made notable advances with external quantum efficiency of over 20%, but still exhibit low electroluminescence brightness insufficient for outdoor displays. Here, it is demonstrated that compact phenethylammonium tin iodide (PEA2SnI4) films with an intact crystal structure can offer high luminance by optimizing the perovskite crystallization rate simultaneously with engineering the grain surface. Ammonium thiocyanate is added to the precursor solution to generate the film with PEA2SnIxSCN4-x and NH4I after spin-coating. Sn2+ and SCN− have a strong interaction that slows crystallization to improve PEA2SnI4 crystal quality. During the subsequent annealing, I− from NH4I replaces SCN− in PEA2SnIxSCN4-x by forming thiourea, which can escape from the film to leave intact PEA2SnI4 crystals. It is found that the optimized PEA2SnI4 emitting layers can provide outstanding film coverage, high crystallinity, low trap state density, and superior photophysical performance. Consequently, an impressive brightness of 8285 cd m−2 for pure red electroluminescence is achieved, the first report of Sn-based perovskite light-emitting diodes that meet outdoor display requirements.
{"title":"Superbly Bright Tin-Based Perovskite LEDs","authors":"Zeyu Miao, Jie Guo, Dan Jiang, Weijia Zheng, Wenxu Yin, Zhao Luo, Xinyan Zhou, Zhou Jiang, Wei Zhang, Xiuyun Zhang, Cong Chen, Xingliang Dai, Qingfeng Dong, Xuyong Yang, Ning Wang, Tom Wu, Xiaoyu Zhang, Jiaqi Zhang","doi":"10.1002/lpor.202401590","DOIUrl":"https://doi.org/10.1002/lpor.202401590","url":null,"abstract":"Tin (Sn)-based perovskites have made notable advances with external quantum efficiency of over 20%, but still exhibit low electroluminescence brightness insufficient for outdoor displays. Here, it is demonstrated that compact phenethylammonium tin iodide (PEA<sub>2</sub>SnI<sub>4</sub>) films with an intact crystal structure can offer high luminance by optimizing the perovskite crystallization rate simultaneously with engineering the grain surface. Ammonium thiocyanate is added to the precursor solution to generate the film with PEA<sub>2</sub>SnI<i><sub>x</sub></i>SCN<sub>4-</sub><i><sub>x</sub></i> and NH<sub>4</sub>I after spin-coating. Sn<sup>2+</sup> and SCN<sup>−</sup> have a strong interaction that slows crystallization to improve PEA<sub>2</sub>SnI<sub>4</sub> crystal quality. During the subsequent annealing, I<sup>−</sup> from NH<sub>4</sub>I replaces SCN<sup>−</sup> in PEA<sub>2</sub>SnI<i><sub>x</sub></i>SCN<sub>4-</sub><i><sub>x</sub></i> by forming thiourea, which can escape from the film to leave intact PEA<sub>2</sub>SnI<sub>4</sub> crystals. It is found that the optimized PEA<sub>2</sub>SnI<sub>4</sub> emitting layers can provide outstanding film coverage, high crystallinity, low trap state density, and superior photophysical performance. Consequently, an impressive brightness of 8285 cd m<sup>−2</sup> for pure red electroluminescence is achieved, the first report of Sn-based perovskite light-emitting diodes that meet outdoor display requirements.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"17 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987157","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}
Possessing a long coherent length, high repetition rate, and fast frequency-sweeping laser sources with narrow linewidth is crucial components in coherent frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) systems. While these attributes are realized individually in standalone devices, the integration of these features into a single laser represents a significant advancement in the field. In this study, a hybrid integrated laser that achieves a linewidth of 9 kHz, a wide frequency-modulation response extending up to 68 MHz, and a low chirp nonlinearity of 4.3 × 10−6 at a repetition rate of 100 kHz is presented. The achievement of this performance is made possible through self-injection locking of a DFB laser diode to a low-loss Si3N4 micro-ring resonator on the dual-layer Si3N4-Si platform. Through the application of a fast-converging pre-distortion algorithm and a driving signal with 150 mV amplitude, a linear FMCW signal with 1.05 GHz frequency excursion is generated. Exploiting the wideband FM response of the PIN phase shifter, a frequency-agile FMCW light source engine capable of generating linear FMCW signals at repetition rates of up to 2 MHz is successfully developed. Leveraging these cutting-edge capabilities, an FMCW LiDAR ranging system for target detection across varying distances, achieving a high ranging precision of 0.4 cm for targets at 6.2 m, is implemented. This innovative work not only demonstrates the feasibility of integrating multiple advanced functionalities into a single laser but also demonstrates the potential for enhancing the resolution and precision of FMCW LiDAR systems for a wide range of applications.
{"title":"Fast-Tuning and Narrow-Linewidth Hybrid Laser for FMCW Ranging","authors":"Chuxin Liu, Yuyao Guo, Yanyang Zhou, Xinhang Li, Liangjun Lu, Yu Li, Wansu Bao, Jianping Chen, Linjie Zhou","doi":"10.1002/lpor.202401338","DOIUrl":"https://doi.org/10.1002/lpor.202401338","url":null,"abstract":"Possessing a long coherent length, high repetition rate, and fast frequency-sweeping laser sources with narrow linewidth is crucial components in coherent frequency-modulated continuous-wave (FMCW) light detection and ranging (LiDAR) systems. While these attributes are realized individually in standalone devices, the integration of these features into a single laser represents a significant advancement in the field. In this study, a hybrid integrated laser that achieves a linewidth of 9 kHz, a wide frequency-modulation response extending up to 68 MHz, and a low chirp nonlinearity of 4.3 × 10<sup>−6</sup> at a repetition rate of 100 kHz is presented. The achievement of this performance is made possible through self-injection locking of a DFB laser diode to a low-loss Si<sub>3</sub>N<sub>4</sub> micro-ring resonator on the dual-layer Si<sub>3</sub>N<sub>4</sub>-Si platform. Through the application of a fast-converging pre-distortion algorithm and a driving signal with 150 mV amplitude, a linear FMCW signal with 1.05 GHz frequency excursion is generated. Exploiting the wideband FM response of the PIN phase shifter, a frequency-agile FMCW light source engine capable of generating linear FMCW signals at repetition rates of up to 2 MHz is successfully developed. Leveraging these cutting-edge capabilities, an FMCW LiDAR ranging system for target detection across varying distances, achieving a high ranging precision of 0.4 cm for targets at 6.2 m, is implemented. This innovative work not only demonstrates the feasibility of integrating multiple advanced functionalities into a single laser but also demonstrates the potential for enhancing the resolution and precision of FMCW LiDAR systems for a wide range of applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"26 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981667","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}
Deependra Jadoun, Hari K. Yadalam, Upendra Harbola, Vladimir Y. Chernyak, Matthias Kizmann, Shaul Mukamel
Pathway selectivity in quantum spectroscopy with entangled photons is a powerful spectroscopic tool. Phase-matched signals involving classical light contain contributions from multiple material pathways, whereas quantum spectroscopy may allow the selection of individual pathways. 2D electronic-vibrational spectroscopy (2DEVS) is a four-wave mixing technique which employs visible and infrared entangled photons. It is showed how the three contributing pathways—ground state bleach, excited state absorption, and excited state emission—can be separated by photon-number-resolved coincidence measurements. Entangled photons thus reveal spectral features not visible in the classical signal, with an enhanced spectral resolution.
{"title":"Pathway Selectivity in 2D Electronic-Vibrational Spectroscopy with Quantum Light","authors":"Deependra Jadoun, Hari K. Yadalam, Upendra Harbola, Vladimir Y. Chernyak, Matthias Kizmann, Shaul Mukamel","doi":"10.1002/lpor.202401576","DOIUrl":"https://doi.org/10.1002/lpor.202401576","url":null,"abstract":"Pathway selectivity in quantum spectroscopy with entangled photons is a powerful spectroscopic tool. Phase-matched signals involving classical light contain contributions from multiple material pathways, whereas quantum spectroscopy may allow the selection of individual pathways. 2D electronic-vibrational spectroscopy (2DEVS) is a four-wave mixing technique which employs visible and infrared entangled photons. It is showed how the three contributing pathways—ground state bleach, excited state absorption, and excited state emission—can be separated by photon-number-resolved coincidence measurements. Entangled photons thus reveal spectral features not visible in the classical signal, with an enhanced spectral resolution.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"92 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981668","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}
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