Non-Hermitian systems offer significant advantages in sensing technology, with most studies primarily focused on exceptional points. However, the extreme sensitivity near these points poses great challenges due to fabrication errors and system noises, which degrade sensing performance. To address this, a novel approach is introduced that leverages the polarization degrees of freedom in non-Hermitian systems. A direct relation between the incident polarization angle and the transmission phase of a coupled metasurface system is achieved and the polarization-controlled phase singularity even post-fabrication is achieved. In addition, the incident polarization angle is utilized as a sensing index, which enables indirect and accurate measurement. The theoretical approach is experimentally validated using a general design of THz non-Hermitian metasurface sensors. The method enhances robustness and sensitivity, opening new avenues for practical applications in ultra-sensitive sensing.
{"title":"Polarization-Controlled Non-Hermitian Metasurfaces for Ultra-Sensitive Terahertz Sensing","authors":"Xintong Shi, Hai Lin, Tingting Liu, Yun Shen, Rongxin Tang, Le Li, Junyi Zhang, Yanjie Wu, Shouxin Duan, Chenhui Zhao, Shuyuan Xiao","doi":"10.1002/lpor.202500172","DOIUrl":"https://doi.org/10.1002/lpor.202500172","url":null,"abstract":"Non-Hermitian systems offer significant advantages in sensing technology, with most studies primarily focused on exceptional points. However, the extreme sensitivity near these points poses great challenges due to fabrication errors and system noises, which degrade sensing performance. To address this, a novel approach is introduced that leverages the polarization degrees of freedom in non-Hermitian systems. A direct relation between the incident polarization angle and the transmission phase of a coupled metasurface system is achieved and the polarization-controlled phase singularity even post-fabrication is achieved. In addition, the incident polarization angle is utilized as a sensing index, which enables indirect and accurate measurement. The theoretical approach is experimentally validated using a general design of THz non-Hermitian metasurface sensors. The method enhances robustness and sensitivity, opening new avenues for practical applications in ultra-sensitive sensing.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"23 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737200","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}
In recent years, optoelectronic synapses made from 2D materials like black phosphorus, MoS2, InSe, and organic compounds have rapidly developed. A suitable bandgap enables them to respond to light stimuli in a manner similar to the responses of the human eye's visual neurons. However, most synapses made from these materials suffer from drawbacks such as high costs, complex device structures, and narrow spectral response ranges. This paper introduces a low-energy consumption artificial optoelectronic synapse based on 18R-SnSe2, prepared using mechanical exfoliation, which demonstrates excellent synaptic functions within the visible to near-infrared range. The modulation of optical pulses achieves the conversion from short-term memory (STM) to long-term memory (LTM). Furthermore, through simulations based on convolutional neural network (CNN) algorithms, the device achieves high-accuracy recognition of handwritten digit images and has strong fault tolerance against noise. Even at a noise level of 40%, it maintains an accuracy of over 89%, revealing great application potential in neuromorphic computing.
{"title":"Artificial Optoelectronic Synapse Based on 18R-Phase SnSe2 for Neuromorphic Computing","authors":"Yue Yu, Lingling Zhang, Yufan Zheng, Beituo Liu, Zhenyu Li, Mingqing Cui, Yunqin Li, Wenyi Tong, Ruijuan Qi, Shuaifei Mao, Fangyu Yue, Hui Peng, Rong Huang, Chungang Duan","doi":"10.1002/lpor.202500214","DOIUrl":"https://doi.org/10.1002/lpor.202500214","url":null,"abstract":"In recent years, optoelectronic synapses made from 2D materials like black phosphorus, MoS<sub>2</sub>, InSe, and organic compounds have rapidly developed. A suitable bandgap enables them to respond to light stimuli in a manner similar to the responses of the human eye's visual neurons. However, most synapses made from these materials suffer from drawbacks such as high costs, complex device structures, and narrow spectral response ranges. This paper introduces a low-energy consumption artificial optoelectronic synapse based on 18R-SnSe<sub>2</sub>, prepared using mechanical exfoliation, which demonstrates excellent synaptic functions within the visible to near-infrared range. The modulation of optical pulses achieves the conversion from short-term memory (STM) to long-term memory (LTM). Furthermore, through simulations based on convolutional neural network (CNN) algorithms, the device achieves high-accuracy recognition of handwritten digit images and has strong fault tolerance against noise. Even at a noise level of 40%, it maintains an accuracy of over 89%, revealing great application potential in neuromorphic computing.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"18 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745687","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}
XueLian Yu, ZhengXian Wang, Jia Niu, YanQian Sun, XiuFang li
Interference-free coded aperture correlation holography (I-COACH) is an innovative incoherent digital holography method capable of recording 3D scenes without lasers or dual-wave interference, offering significant potential in diverse applications. quantitative phase imaging (QPI) is a noninvasive optical technique for extracting phase information of transparent samples, often requiring interference or diffraction combined with phase reconstruction algorithms. However, I-COACH's partially coherent illumination and noninterference recording limit its phase extraction capability. A complex amplitude cross-correlation method is introduced to overcome these limitations. This method avoids dual-wave interference, numerical inversion, diffraction distance considerations, and coded phase mask (CPM) modulation effects. It reconstructs the sample's complex amplitude by determining the complex amplitudes of the point source hologram (PSH) and object hologram (OH) and applying cross-correlation. Experimental results from I-COACH and coherent diffraction imaging confirm its ability to reconstruct phase distributions effectively. The method also offers excellent 3D digital refocusing and remains applicable under coherent illumination. This approach expands the utility of I-COACH, particularly for biomedical imaging.
{"title":"Quantitative Phase Imaging Based on the Coded Aperture Correlation Holography Cross-Correlation Reconstruction Method","authors":"XueLian Yu, ZhengXian Wang, Jia Niu, YanQian Sun, XiuFang li","doi":"10.1002/lpor.202402175","DOIUrl":"https://doi.org/10.1002/lpor.202402175","url":null,"abstract":"Interference-free coded aperture correlation holography (I-COACH) is an innovative incoherent digital holography method capable of recording 3D scenes without lasers or dual-wave interference, offering significant potential in diverse applications. quantitative phase imaging (QPI) is a noninvasive optical technique for extracting phase information of transparent samples, often requiring interference or diffraction combined with phase reconstruction algorithms. However, I-COACH's partially coherent illumination and noninterference recording limit its phase extraction capability. A complex amplitude cross-correlation method is introduced to overcome these limitations. This method avoids dual-wave interference, numerical inversion, diffraction distance considerations, and coded phase mask (CPM) modulation effects. It reconstructs the sample's complex amplitude by determining the complex amplitudes of the point source hologram (PSH) and object hologram (OH) and applying cross-correlation. Experimental results from I-COACH and coherent diffraction imaging confirm its ability to reconstruct phase distributions effectively. The method also offers excellent 3D digital refocusing and remains applicable under coherent illumination. This approach expands the utility of I-COACH, particularly for biomedical imaging.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"1 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737155","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}
Driven by the growing demands in wireless communication, remote sensing and emerging 6G networks, research on microwave signal measurement techniques has attached intensive attention. Unlike conventional electronic-based approaches, photonics chip-based microwave signal measurement systems offer significant advantages, including broad operation bandwidth, reduced weight, and enhanced resistance to unwanted electromagnetic interference. Despite notable progress in integrated microwave photonic measurement systems, the majority remains constrained by bandwidth below 30 GHz, primarily due to the limitation of modulators. Furthermore, most previous studies focus on the measurement of one single parameter, typically the frequency, limiting their applications in more complex, real-world situations. Here, an on-chip photonic microwave multi-parameter measurement system is presented on the thin-film lithium niobate (TFLN) platform. The system enables measurement of microwave frequency, phase, and amplitude, offering an ultra-high bandwidth (up to 60 GHz) with low root-mean-squared errors: 450 MHz for frequency, 3.43° for phase, and 1.64% for amplitude. Additionally, the system is validated by the time-domain reconstruction of unknown sinusoidal microwave signals based on measurement results. This demonstration further broadens the scope of integrated TFLN photonic devices for microwave signal measurement, providing a viable solution to the bandwidth limitations of existing microwave networks and addressing the increasing demands of future information-driven technologies.
{"title":"Integrated Microwave Photonics Multi-Parameter Measurement System","authors":"Yong Zheng, Zhen Han, Liheng Wang, Pu Zhang, Yongheng Jiang, Huifu Xiao, Xudong Zhou, Mingrui Yuan, Mei Xian Low, Aditya Dubey, Thach Giang Nguyen, Qinfen Hao, Guanghui Ren, Arnan Mitchell, Yonghui Tian","doi":"10.1002/lpor.202500013","DOIUrl":"https://doi.org/10.1002/lpor.202500013","url":null,"abstract":"Driven by the growing demands in wireless communication, remote sensing and emerging 6G networks, research on microwave signal measurement techniques has attached intensive attention. Unlike conventional electronic-based approaches, photonics chip-based microwave signal measurement systems offer significant advantages, including broad operation bandwidth, reduced weight, and enhanced resistance to unwanted electromagnetic interference. Despite notable progress in integrated microwave photonic measurement systems, the majority remains constrained by bandwidth below 30 GHz, primarily due to the limitation of modulators. Furthermore, most previous studies focus on the measurement of one single parameter, typically the frequency, limiting their applications in more complex, real-world situations. Here, an on-chip photonic microwave multi-parameter measurement system is presented on the thin-film lithium niobate (TFLN) platform. The system enables measurement of microwave frequency, phase, and amplitude, offering an ultra-high bandwidth (up to 60 GHz) with low root-mean-squared errors: 450 MHz for frequency, 3.43° for phase, and 1.64% for amplitude. Additionally, the system is validated by the time-domain reconstruction of unknown sinusoidal microwave signals based on measurement results. This demonstration further broadens the scope of integrated TFLN photonic devices for microwave signal measurement, providing a viable solution to the bandwidth limitations of existing microwave networks and addressing the increasing demands of future information-driven technologies.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"36 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737154","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}
Miniaturized LEDs (mini-LEDs) constitute a high-quality light source in the backlight unit (BLU) of liquid crystal displays (LCDs). However, the Lambertian light field distribution of mini-LEDs leads to limited viewing angles and decreased uniformity in BLU. Here, a high-performance wide-angle mini-LED is demonstrated via device engineering and an innovative photon extraction strategy. By integrating distributed Bragg reflectors (DBRs) on the light emission surface of mini-LED, propagation behaviors of photons are manipulated and thus altered Lambertian light field distribution into heart-shaped light field distribution, realizing the construction of wide-angle mini-LED. Furthermore, the effects of the reflectivity of various DBRs on the light field distribution and optoelectronic characteristics of wide-angle mini-LEDs are systematically investigated. To boost the external quantum efficiency (EQE) of wide-angle mini-LEDs, a photon extraction strategy, including optimizing sapphire substrate thickness and employing multiple laser stealth scribing techniques is proposed. As a result, the optimal wide-angle mini-LED exhibits a peak light intensity angle of 38°, a full width at half maximum of angular light intensity distribution of 162° and a 21.3% increment in peak EQE, in comparison to the wide-angle mini-LED without utilizing photon extraction strategy. It believes these innovations provide a substantial advancement in developing wide-angle mini-LEDs, contributing to their application in LCDs.
{"title":"Toward Wide-Angle III-Nitride Miniaturized LEDs: Device Engineering and Photon Extraction Strategy","authors":"Lang Shi, Siyuan Cui, Ziqi Zhang, Jingjing Jiang, Yuechang Sun, Sheng Liu, Shengjun Zhou","doi":"10.1002/lpor.202401723","DOIUrl":"https://doi.org/10.1002/lpor.202401723","url":null,"abstract":"Miniaturized LEDs (mini-LEDs) constitute a high-quality light source in the backlight unit (BLU) of liquid crystal displays (LCDs). However, the Lambertian light field distribution of mini-LEDs leads to limited viewing angles and decreased uniformity in BLU. Here, a high-performance wide-angle mini-LED is demonstrated via device engineering and an innovative photon extraction strategy. By integrating distributed Bragg reflectors (DBRs) on the light emission surface of mini-LED, propagation behaviors of photons are manipulated and thus altered Lambertian light field distribution into heart-shaped light field distribution, realizing the construction of wide-angle mini-LED. Furthermore, the effects of the reflectivity of various DBRs on the light field distribution and optoelectronic characteristics of wide-angle mini-LEDs are systematically investigated. To boost the external quantum efficiency (EQE) of wide-angle mini-LEDs, a photon extraction strategy, including optimizing sapphire substrate thickness and employing multiple laser stealth scribing techniques is proposed. As a result, the optimal wide-angle mini-LED exhibits a peak light intensity angle of 38°, a full width at half maximum of angular light intensity distribution of 162° and a 21.3% increment in peak EQE, in comparison to the wide-angle mini-LED without utilizing photon extraction strategy. It believes these innovations provide a substantial advancement in developing wide-angle mini-LEDs, contributing to their application in LCDs.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"33 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736543","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}
Luminescent composite ceramics with two or more distinct phosphors are required to finely control the optical properties of laser‐driven solid‐state lighting, but they are hardly densified due to their different sintering temperature and chemical reactions between them. Then, highly dense and efficient dual‐phosphor ceramics consisting of orange‐emitting Ca‐α‐SiAlON:Eu and yellow‐emitting YAG:Ce phosphors is successfully prepared by spark plasma sintering. Fine Ca‐α‐SiAlON:Eu powders and Al2O3‐coated YAG:Ce (YAG:Ce@Al2O3) powders are used as raw materials, which enable to obtain dense Al2O3‐Ca‐α‐SiAlON:Eu (Ceramic‐Ca) and Al2O3‐Ca‐α‐SiAlON:Eu‐YAG:Ce@Al2O3 (Ceramic‐Ca+Y@Al2O3) ceramics at 1480 °C. The chemical reaction between Ca‐α‐SiAlON:Eu and YAG:Ce can be hindered by using the Al2O3 surface coating, and the photoluminescence properties of both phosphors are thus remainedduring high‐temperature sintering. The Ceramic‐Ca+Y@Al2O3 show tunable spectra with emission maximum ranging from 541 to 601 nm, an external quantum efficiency of ≈42%, thermal conductivity of >17.6 W m−1 K, maximal luminance saturation of 18.8 W mm−2, excellent thermal and color stabilities. It demonstrates that the dual‐phosphor ceramics containing equivalent Ca‐α‐SiAlON:Eu and YAG:Ce allow to create super‐brightness laser lighting with an output luminous flux density of 782.5 lm mm−2 and a color temperature of 2278 K. This work paves an avenue to fabricate multi‐phosphor composite ceramics for color‐temperature‐tunable laser‐driven white light.
{"title":"Spectrally Tunable Dual‐Phosphor Ceramics for Laser Lighting","authors":"Rundong Tian, Tianliang Zhou, Rong‐Jun Xie","doi":"10.1002/lpor.202402144","DOIUrl":"https://doi.org/10.1002/lpor.202402144","url":null,"abstract":"Luminescent composite ceramics with two or more distinct phosphors are required to finely control the optical properties of laser‐driven solid‐state lighting, but they are hardly densified due to their different sintering temperature and chemical reactions between them. Then, highly dense and efficient dual‐phosphor ceramics consisting of orange‐emitting Ca‐α‐SiAlON:Eu and yellow‐emitting YAG:Ce phosphors is successfully prepared by spark plasma sintering. Fine Ca‐α‐SiAlON:Eu powders and Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>‐coated YAG:Ce (YAG:Ce@Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) powders are used as raw materials, which enable to obtain dense Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>‐Ca‐α‐SiAlON:Eu (Ceramic‐Ca) and Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>‐Ca‐α‐SiAlON:Eu‐YAG:Ce@Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> (Ceramic‐Ca+Y@Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) ceramics at 1480 °C. The chemical reaction between Ca‐α‐SiAlON:Eu and YAG:Ce can be hindered by using the Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> surface coating, and the photoluminescence properties of both phosphors are thus remainedduring high‐temperature sintering. The Ceramic‐Ca+Y@Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> show tunable spectra with emission maximum ranging from 541 to 601 nm, an external quantum efficiency of ≈42%, thermal conductivity of >17.6 W m<jats:sup>−1</jats:sup> K, maximal luminance saturation of 18.8 W mm<jats:sup>−2</jats:sup>, excellent thermal and color stabilities. It demonstrates that the dual‐phosphor ceramics containing equivalent Ca‐α‐SiAlON:Eu and YAG:Ce allow to create super‐brightness laser lighting with an output luminous flux density of 782.5 lm mm<jats:sup>−2</jats:sup> and a color temperature of 2278 K. This work paves an avenue to fabricate multi‐phosphor composite ceramics for color‐temperature‐tunable laser‐driven white light.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"7 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143733883","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}
Fei Han, Kacper Pilarczyk, Zaoyang Lin, Conglin Sun, Guy A. E. Vandenbosch, Joris Van de Vondel, Pol Van Dorpe, Xuezhi Zheng, Niels Verellen, Ewald Janssens
Optical modulators based on tunable graphene-metal hybrid metasurfaces have emerged as promising optoelectronic devices due to their high speed and efficient modulation that is controllable through electrostatic gating. In particular, optical modulation in the mid-infrared region has attracted considerable interest for applications in biosensing, imaging, communication, and computing. However, the scalability of metasurfaces poses a challenge as typical fabrication pathways are not compatible with complementary metal-oxide-semiconductor (CMOS) technology. In this work, a tunable graphene-metasurface absorber is presented that integrates a metal-dielectric-metal optical cavity with a graphene layer. Stable performance in ambient conditions is achieved by the incorporation of an ultrathin Al₂O₃ capping layer. This barrier layer prevents direct contact between the metallic antennas and the graphene layer, which results in a large on/off ratio. For a gold metasurface, the creation of an optical cavity strongly enhances the modulation depth of the reflectance between 7 µm to 8 µm from 11% to 47%. By replacing gold with aluminum, a cost-effective material employed in foundry processes, a comparable maximum modulation depth of 49% is obtained. These results open a new pathway for the integration of tunable graphene–metal hybrid metasurfaces with CMOS-compatible technologies, facilitating a scalable production of mid-infrared modulators.
{"title":"Mid-Infrared Reflectance Modulator Based on a Graphene CMOS-Compatible Metasurface","authors":"Fei Han, Kacper Pilarczyk, Zaoyang Lin, Conglin Sun, Guy A. E. Vandenbosch, Joris Van de Vondel, Pol Van Dorpe, Xuezhi Zheng, Niels Verellen, Ewald Janssens","doi":"10.1002/lpor.202402258","DOIUrl":"https://doi.org/10.1002/lpor.202402258","url":null,"abstract":"Optical modulators based on tunable graphene-metal hybrid metasurfaces have emerged as promising optoelectronic devices due to their high speed and efficient modulation that is controllable through electrostatic gating. In particular, optical modulation in the mid-infrared region has attracted considerable interest for applications in biosensing, imaging, communication, and computing. However, the scalability of metasurfaces poses a challenge as typical fabrication pathways are not compatible with complementary metal-oxide-semiconductor (CMOS) technology. In this work, a tunable graphene-metasurface absorber is presented that integrates a metal-dielectric-metal optical cavity with a graphene layer. Stable performance in ambient conditions is achieved by the incorporation of an ultrathin Al₂O₃ capping layer. This barrier layer prevents direct contact between the metallic antennas and the graphene layer, which results in a large on/off ratio. For a gold metasurface, the creation of an optical cavity strongly enhances the modulation depth of the reflectance between 7 µm to 8 µm from 11% to 47%. By replacing gold with aluminum, a cost-effective material employed in foundry processes, a comparable maximum modulation depth of 49% is obtained. These results open a new pathway for the integration of tunable graphene–metal hybrid metasurfaces with CMOS-compatible technologies, facilitating a scalable production of mid-infrared modulators.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"69 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734421","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}
The development of eco-friendly, flexibly preparable, and highly efficient glass scintillators is of paramount importance for practical applications in fields such as medical imaging and radiation detection. Herein, a series of Tb3+-doped oxyfluoride glass is successfully synthesized using the high-temperature melt-quenching method. The oxyfluoride glasses exhibit bright green photoluminescence with an internal quantum yield (IQE) of 95.6% and high optical transmittance exceeding 85% at 550 nm. Specifically, the optimized LASNG: 4 mol% Tb3+ glass demonstrates superior performance, including a significantly enhanced X-ray excites luminescence (XEL) with an integrated intensity 209% that of Bi4Ge3O12 (BGO) and an exceptional spatial resolution of 30 lp∙mm−1 under X-ray irradiation-surpassing most of the reported glass scintillators. Additionally, it also exhibits a linear response to X-ray dose rates with a low detection limit of 1.5 µGy∙s−1 and maintains excellent irradiation stability under continuous X-ray exposure. This study proposes a promising approach for the development of cost-effective, high-resolution, and scalable glass scintillators tailored for X-ray imaging and detection applications.
{"title":"Flexibly Prepared Tb3+-Doped Oxyfluoride Glass Scintillators with Enhanced Luminescence for X-Ray Imaging and Detection","authors":"Dandan Zhang, Shisheng Lin, Mengling Xia, Yu Rao, Sen Qian, Jing Ren, Xianghua Zhang, Yinsheng Xu, Daqin Chen","doi":"10.1002/lpor.202500354","DOIUrl":"https://doi.org/10.1002/lpor.202500354","url":null,"abstract":"The development of eco-friendly, flexibly preparable, and highly efficient glass scintillators is of paramount importance for practical applications in fields such as medical imaging and radiation detection. Herein, a series of Tb<sup>3+</sup>-doped oxyfluoride glass is successfully synthesized using the high-temperature melt-quenching method. The oxyfluoride glasses exhibit bright green photoluminescence with an internal quantum yield (IQE) of 95.6% and high optical transmittance exceeding 85% at 550 nm. Specifically, the optimized LASNG: 4 mol% Tb<sup>3+</sup> glass demonstrates superior performance, including a significantly enhanced X-ray excites luminescence (XEL) with an integrated intensity 209% that of Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub> (BGO) and an exceptional spatial resolution of 30 lp∙mm<sup>−1</sup> under X-ray irradiation-surpassing most of the reported glass scintillators. Additionally, it also exhibits a linear response to X-ray dose rates with a low detection limit of 1.5 µGy∙s<sup>−1</sup> and maintains excellent irradiation stability under continuous X-ray exposure. This study proposes a promising approach for the development of cost-effective, high-resolution, and scalable glass scintillators tailored for X-ray imaging and detection applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"21 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736545","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}
Yi Liu, Feng Liu, Chengrui Wang, Lizhu Sun, Bingbing Yang, Hao Wu, Liangliang Zhang, Jiahua Zhang, Xiao-jun Wang, Yichun Liu
Upconversion luminescence (UCL) presents a promising avenue for optical anticounterfeiting applications; however, its practical implementation is often limited by low visibility in bright environments. In this study, a white-light sensitization strategy is introduced to significantly amplify UV UCL for improved security measures under well-lit conditions. By integrating 808 nm infrared excitation with a white-light flashlight exposure, a ten-fold increase in UCL intensity at 354 nm is achieved from a NaYF4:Nd3+ phosphor. This enhancement arises from a multi-photon excitation process, wherein white light directly populates the high-lying 4G7/2 and 4G5/2 intermediate levels of Nd3+, excited states otherwise only accessible via two-photon infrared absorption. This white-light sensitization approach enables robust UV UCL emission to be detected even in bright settings, overcoming a major limitation of traditional UCL-based anticounterfeiting. Moreover, the feasibility of this method is demonstrated through UV imaging, highlighting its potential for advancing security and authentication technologies.
{"title":"White-Light Sensitization Strategy for Upconverting Anticounterfeiting","authors":"Yi Liu, Feng Liu, Chengrui Wang, Lizhu Sun, Bingbing Yang, Hao Wu, Liangliang Zhang, Jiahua Zhang, Xiao-jun Wang, Yichun Liu","doi":"10.1002/lpor.202500083","DOIUrl":"https://doi.org/10.1002/lpor.202500083","url":null,"abstract":"Upconversion luminescence (UCL) presents a promising avenue for optical anticounterfeiting applications; however, its practical implementation is often limited by low visibility in bright environments. In this study, a white-light sensitization strategy is introduced to significantly amplify UV UCL for improved security measures under well-lit conditions. By integrating 808 nm infrared excitation with a white-light flashlight exposure, a ten-fold increase in UCL intensity at 354 nm is achieved from a NaYF<sub>4</sub>:Nd<sup>3+</sup> phosphor. This enhancement arises from a multi-photon excitation process, wherein white light directly populates the high-lying <sup>4</sup>G<sub>7/2</sub> and <sup>4</sup>G<sub>5/2</sub> intermediate levels of Nd<sup>3+</sup>, excited states otherwise only accessible via two-photon infrared absorption. This white-light sensitization approach enables robust UV UCL emission to be detected even in bright settings, overcoming a major limitation of traditional UCL-based anticounterfeiting. Moreover, the feasibility of this method is demonstrated through UV imaging, highlighting its potential for advancing security and authentication technologies.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"216 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736546","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}
This paper reviews recent advancements in second harmonic generation (SHG) within nanostructures of lithium niobate on insulator (LNOI). SHG devices are classified into in-plane and out-of-plane configurations, highlighting their suitability for different pumping conditions. The in-plane devices, with their small mode volume and ultra-narrow linewidth, demonstrate high-efficiency SHG under continuous wave pumping, making them ideal for miniaturized on-chip integrated devices. In contrast, the vertical cavities are best suited for broadband pulsed lasers, facilitating the creation of compact ultra-thin devices. This review summarizes the recent strides made in enhancing SHG efficiency for different designs in LNOI platform and underscores the potential of LN micro- and nanostructures to fulfill the requirements of modern ultracompact nonlinear devices.
{"title":"Second Harmonic Generation in Lithium Niobate on Insulator","authors":"Lun Qu, Wei Wu, Wei Cai, Mengxin Ren, Jingjun Xu","doi":"10.1002/lpor.202401928","DOIUrl":"https://doi.org/10.1002/lpor.202401928","url":null,"abstract":"This paper reviews recent advancements in second harmonic generation (SHG) within nanostructures of lithium niobate on insulator (LNOI). SHG devices are classified into in-plane and out-of-plane configurations, highlighting their suitability for different pumping conditions. The in-plane devices, with their small mode volume and ultra-narrow linewidth, demonstrate high-efficiency SHG under continuous wave pumping, making them ideal for miniaturized on-chip integrated devices. In contrast, the vertical cavities are best suited for broadband pulsed lasers, facilitating the creation of compact ultra-thin devices. This review summarizes the recent strides made in enhancing SHG efficiency for different designs in LNOI platform and underscores the potential of LN micro- and nanostructures to fulfill the requirements of modern ultracompact nonlinear devices.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"19 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143737158","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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