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}
Jie Zhang, Fei Xu, Xiuyan Gao, Zhaojiang You, Yongsheng Gao, Duanqi Ma, Bin Xia, Dehua Wang, Shufang Zhang, Kai Wang
2D bismuth-based perovskites have attention as a potentially transformative technology in optoelectronics due to their exceptional non-toxic and environmentally friendly properties. However, their practical applications are hindered by the low luminous efficiency caused by self-trapped excitons (STEs) under normal environmental conditions. Here, a new composition of lead-free ultrathin 2D perovskite nanosheet iso-octylamine bismuth bromide [(i-OA)3BiBr6] is synthesized, with thicknesses down to 1.1 nm, using a solution-based method and explored their stability. Notably, the behavior of STEs in these ultrathin nanosheets can be modulated through a pressure treatment strategy. After completely releasing the pressure, an optimal lattice distortion is stabilized, resulting in an 80-fold increase in irreversible pressure-induced emission. This finding highlights the critical roles of steric hindrance and hydrogen bonding cooperativity effects in the organic cationic layers, along with OA ligand passivation, in enhancing STE radiation recombination under ambient conditions. This advancement opens new possibilities for creating stable, bright STEs under ambient conditions, thus facilitating its potential applications in the fields of pressure sensing, display, and energy savings.
{"title":"Synthesis and Irreversible Pressure-Induced Emission Enhancement of Ultrathin Lead-Free 2D Organic–Inorganic Hybrid Perovskite (i-OA)3BiBr6 Nanosheets at Room Temperature","authors":"Jie Zhang, Fei Xu, Xiuyan Gao, Zhaojiang You, Yongsheng Gao, Duanqi Ma, Bin Xia, Dehua Wang, Shufang Zhang, Kai Wang","doi":"10.1002/lpor.202401888","DOIUrl":"https://doi.org/10.1002/lpor.202401888","url":null,"abstract":"2D bismuth-based perovskites have attention as a potentially transformative technology in optoelectronics due to their exceptional non-toxic and environmentally friendly properties. However, their practical applications are hindered by the low luminous efficiency caused by self-trapped excitons (STEs) under normal environmental conditions. Here, a new composition of lead-free ultrathin 2D perovskite nanosheet iso-octylamine bismuth bromide [(i-OA)<sub>3</sub>BiBr<sub>6</sub>] is synthesized, with thicknesses down to 1.1 nm, using a solution-based method and explored their stability. Notably, the behavior of STEs in these ultrathin nanosheets can be modulated through a pressure treatment strategy. After completely releasing the pressure, an optimal lattice distortion is stabilized, resulting in an 80-fold increase in irreversible pressure-induced emission. This finding highlights the critical roles of steric hindrance and hydrogen bonding cooperativity effects in the organic cationic layers, along with OA ligand passivation, in enhancing STE radiation recombination under ambient conditions. This advancement opens new possibilities for creating stable, bright STEs under ambient conditions, thus facilitating its potential applications in the fields of pressure sensing, display, and energy savings.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"34 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981664","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}
Terahertz (THz, 0.3–10 THz) radar systems have garnered significant attention due to their superior capabilities in high-precision and robust sensing. However, the susceptibility to jamming, along with the sensing precision loss and ranging ambiguity induced by inflexible implementation of the conventional radar signal source, presents major challenges to the practical deployment of THz radars. Herein, a flexible photonic chaotic radar system is proposed at the THz band and investigate the ranging performance in precision and ambiguity. The photonic heterodyne detection scheme facilitates the generation of optoelectronic feedback loop-based THz chaos at 300 GHz, achieving a seamless connection between THz domains and optical domains. The system is experimentally demonstrated its superior performance of sub-centimeter resolution with 0.9345 cm and ranging unambiguity simultaneously. This work bridges the THz gap in the practical deployment of chaos theory and will pave the way for a new regime of THz radar empowered by chaos.
{"title":"Photonic Terahertz Chaos Enabling High-Precision and Unambiguous Ranging","authors":"Qiuzhuo Deng, Lu Zhang, Zuomin Yang, Zhidong Lyu, Vjaceslavs Bobrovs, Xiaodan Pang, Oskars Ozolins, Xianbin Yu","doi":"10.1002/lpor.202400667","DOIUrl":"https://doi.org/10.1002/lpor.202400667","url":null,"abstract":"Terahertz (THz, 0.3–10 THz) radar systems have garnered significant attention due to their superior capabilities in high-precision and robust sensing. However, the susceptibility to jamming, along with the sensing precision loss and ranging ambiguity induced by inflexible implementation of the conventional radar signal source, presents major challenges to the practical deployment of THz radars. Herein, a flexible photonic chaotic radar system is proposed at the THz band and investigate the ranging performance in precision and ambiguity. The photonic heterodyne detection scheme facilitates the generation of optoelectronic feedback loop-based THz chaos at 300 GHz, achieving a seamless connection between THz domains and optical domains. The system is experimentally demonstrated its superior performance of sub-centimeter resolution with 0.9345 cm and ranging unambiguity simultaneously. This work bridges the THz gap in the practical deployment of chaos theory and will pave the way for a new regime of THz radar empowered by chaos.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"74 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981897","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}
Thin-film lithium niobate (TFLN) based optical microresonators offer large nonlinear coefficient d33 and high light-field confinement, allowing highly efficient second-order optical nonlinear frequency conversion. Here, ultra-efficiency SHG from high-Q polygon modes is achieved by maximizing the utilization of the highest nonlinear coefficient d33 in a monocrystalline X-cut TFLN microdisk resonator for the first time. The polygon modes are designed and formed with two parallel sides perpendicular to the optical axis of the lithium niobate crystal by introducing weak perturbations into the microdisk through a tapered fiber, which maximizes the utilization of d33. The polygon modes exhibit ultrahigh intrinsic Q factors up to 3.86 × 107, due to the fact that polygon modes are located far from the relatively rough sidewall of the microdisk. Moreover, the pump and second harmonic polygon modes share high modal overlap factor of ≈80%. Consequently, SHG from cavity polygon modes with absolute conversion efficiency as high as 48.08% is realized at an on-chip pump level of only 4.60 mW without fine domain structures, surpassing the best results (23% and 30%) reported in other two domain-inversion-free phase matching schemes and even approaching the record (52%) in periodically poled TFLN microresonators.
{"title":"Second Harmonic Generation with 48% Conversion Efficiency from Cavity Polygon Modes in a Monocrystalline Lithium Niobate Microdisk Resonator","authors":"Chao Sun, Jielei Ni, Chuntao Li, Jintian Lin, Renhong Gao, Jianglin Guan, Qian Qiao, Qifeng Hou, Xiaochao Luo, Xinzhi Zheng, Lingling Qiao, Min Wang, Ya Cheng","doi":"10.1002/lpor.202401857","DOIUrl":"https://doi.org/10.1002/lpor.202401857","url":null,"abstract":"Thin-film lithium niobate (TFLN) based optical microresonators offer large nonlinear coefficient <i>d</i><sub>33</sub> and high light-field confinement, allowing highly efficient second-order optical nonlinear frequency conversion. Here, ultra-efficiency SHG from high-Q polygon modes is achieved by maximizing the utilization of the highest nonlinear coefficient <i>d</i><sub>33</sub> in a monocrystalline X-cut TFLN microdisk resonator for the first time. The polygon modes are designed and formed with two parallel sides perpendicular to the optical axis of the lithium niobate crystal by introducing weak perturbations into the microdisk through a tapered fiber, which maximizes the utilization of <i>d</i><sub>33</sub>. The polygon modes exhibit ultrahigh intrinsic <i>Q</i> factors up to 3.86 × 10<sup>7</sup>, due to the fact that polygon modes are located far from the relatively rough sidewall of the microdisk. Moreover, the pump and second harmonic polygon modes share high modal overlap factor of ≈80%. Consequently, SHG from cavity polygon modes with absolute conversion efficiency as high as 48.08% is realized at an on-chip pump level of only 4.60 mW without fine domain structures, surpassing the best results (23% and 30%) reported in other two domain-inversion-free phase matching schemes and even approaching the record (52%) in periodically poled TFLN microresonators.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"20 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981665","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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