ACS Photonics最新文献_第10页

Radiofrequency Receiver Based on Isotropic Solid-State Spins

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-30 DOI: 10.1021/acsphotonics.4c02607

Islay O. Robertson, Brett C. Johnson, Giannis Thalassinos, Sam C. Scholten, Kevin J. Rietwyk, Brant C. Gibson, Jean-Philippe Tetienne, David A. Broadway

{"title":"Radiofrequency Receiver Based on Isotropic Solid-State Spins","authors":"Islay O. Robertson, Brett C. Johnson, Giannis Thalassinos, Sam C. Scholten, Kevin J. Rietwyk, Brant C. Gibson, Jean-Philippe Tetienne, David A. Broadway","doi":"10.1021/acsphotonics.4c02607","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02607","url":null,"abstract":"Optically addressable solid-state spins have been proposed as robust radiofrequency (RF)–optical transducers sensitive to a specific RF frequency tuned by external magnetic fields but often require precise field alignment with the system’s symmetry axis. Here we introduce an isotropic solid-state spin system, namely, weakly coupled spin pairs in hexagonal boron nitride, which acts as an RF–optical transducer independent of the direction of the tuning magnetic field. Using this platform, we demonstrate a single-frequency RF receiver with frequency tunability from 0.1 to 19 GHz and an instantaneous wideband RF spectrum analyzer by applying a magnetic field gradient to encode RF frequency into spatial position. We utilize the spectrum analyzer to detect free-space-transmitted RF signals matching the strength and frequency of typical Wi-Fi signals. This work exemplifies the unique capabilities of isotropic spins to operate as RF sensors, while circumventing the challenging requirement of precisely aligned magnetic fields facing conventional solid-state spins.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"20 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radiofrequency Receiver Based on Isotropic Solid-State Spins

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-30 DOI: 10.1021/acsphotonics.4c0260710.1021/acsphotonics.4c02607

Islay O. Robertson, Brett C. Johnson, Giannis Thalassinos, Sam C. Scholten, Kevin J. Rietwyk, Brant C. Gibson, Jean-Philippe Tetienne* and David A. Broadway*,

{"title":"Radiofrequency Receiver Based on Isotropic Solid-State Spins","authors":"Islay O. Robertson, Brett C. Johnson, Giannis Thalassinos, Sam C. Scholten, Kevin J. Rietwyk, Brant C. Gibson, Jean-Philippe Tetienne* and David A. Broadway*, ","doi":"10.1021/acsphotonics.4c0260710.1021/acsphotonics.4c02607","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02607https://doi.org/10.1021/acsphotonics.4c02607","url":null,"abstract":"Optically addressable solid-state spins have been proposed as robust radiofrequency (RF)–optical transducers sensitive to a specific RF frequency tuned by external magnetic fields but often require precise field alignment with the system’s symmetry axis. Here we introduce an isotropic solid-state spin system, namely, weakly coupled spin pairs in hexagonal boron nitride, which acts as an RF–optical transducer independent of the direction of the tuning magnetic field. Using this platform, we demonstrate a single-frequency RF receiver with frequency tunability from 0.1 to 19 GHz and an instantaneous wideband RF spectrum analyzer by applying a magnetic field gradient to encode RF frequency into spatial position. We utilize the spectrum analyzer to detect free-space-transmitted RF signals matching the strength and frequency of typical Wi-Fi signals. This work exemplifies the unique capabilities of isotropic spins to operate as RF sensors, while circumventing the challenging requirement of precisely aligned magnetic fields facing conventional solid-state spins.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 2","pages":"581–587 581–587"},"PeriodicalIF":6.5,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complementary Speckle Stimulated Emission Depletion Microscopy

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-30 DOI: 10.1021/acsphotonics.4c01364

Payvand Arjmand, Samlan Chandran Thodika, Haoyang Li, Elsa Bivas, Martin Oheim, Hiroyuki Yoshida, Etienne Brasselet, Marc Guillon

{"title":"Complementary Speckle Stimulated Emission Depletion Microscopy","authors":"Payvand Arjmand, Samlan Chandran Thodika, Haoyang Li, Elsa Bivas, Martin Oheim, Hiroyuki Yoshida, Etienne Brasselet, Marc Guillon","doi":"10.1021/acsphotonics.4c01364","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01364","url":null,"abstract":"Stimulated emission depletion (STED) microscopy has emerged as a powerful technique providing visualization of biological structures at the molecular level in living samples. In this technique, the diffraction limit is broken by selectively depleting the fluorophore’s excited state by stimulated emission, typically using a donut-shaped optical vortex beam. STED microscopy performs exceptionally well in degraded optical conditions, such as living tissues. Nevertheless, photobleaching and acquisition time are among the main challenges for imaging large volumetric fields of view. In this regard, random light beams such as speckle patterns have proved to be especially promising for three-dimensional imaging in compressed sensing schemes. Taking advantage of the high spatial density of intrinsic optical vortices in speckles─one of the most commonly used types of structured beams in STED microscopy─we propose here a novel scheme that employs speckles for performing STED microscopy. Two speckle patterns are generated at the excitation and the depletion wavelengths, respectively, exhibiting inverted intensity contrasts. We illustrate spatial resolution enhancement using complementary speckles as excitation and depletion beams on both fluorescent beads and biological samples. Our results establish a robust method for super-resolved three-dimensional imaging with promising perspectives in terms of temporal resolution and photobleaching.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"27 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complementary Speckle Stimulated Emission Depletion Microscopy

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-30 DOI: 10.1021/acsphotonics.4c0136410.1021/acsphotonics.4c01364

Payvand Arjmand*, Samlan Chandran Thodika, Haoyang Li, Elsa Bivas, Martin Oheim, Hiroyuki Yoshida, Etienne Brasselet and Marc Guillon*,

{"title":"Complementary Speckle Stimulated Emission Depletion Microscopy","authors":"Payvand Arjmand*, Samlan Chandran Thodika, Haoyang Li, Elsa Bivas, Martin Oheim, Hiroyuki Yoshida, Etienne Brasselet and Marc Guillon*, ","doi":"10.1021/acsphotonics.4c0136410.1021/acsphotonics.4c01364","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01364https://doi.org/10.1021/acsphotonics.4c01364","url":null,"abstract":"Stimulated emission depletion (STED) microscopy has emerged as a powerful technique providing visualization of biological structures at the molecular level in living samples. In this technique, the diffraction limit is broken by selectively depleting the fluorophore’s excited state by stimulated emission, typically using a donut-shaped optical vortex beam. STED microscopy performs exceptionally well in degraded optical conditions, such as living tissues. Nevertheless, photobleaching and acquisition time are among the main challenges for imaging large volumetric fields of view. In this regard, random light beams such as speckle patterns have proved to be especially promising for three-dimensional imaging in compressed sensing schemes. Taking advantage of the high spatial density of intrinsic optical vortices in speckles─one of the most commonly used types of structured beams in STED microscopy─we propose here a novel scheme that employs speckles for performing STED microscopy. Two speckle patterns are generated at the excitation and the depletion wavelengths, respectively, exhibiting inverted intensity contrasts. We illustrate spatial resolution enhancement using complementary speckles as excitation and depletion beams on both fluorescent beads and biological samples. Our results establish a robust method for super-resolved three-dimensional imaging with promising perspectives in terms of temporal resolution and photobleaching.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 2","pages":"648–654 648–654"},"PeriodicalIF":6.5,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simplest but Efficient Design of a Color Router Optimized by Genetic Algorithms

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-29 DOI: 10.1021/acsphotonics.4c01905

Wei-Lun Hsu, Chen-Yi Yu, You-Song Huang, Qiu-Chun Zeng, Yen-Chun Chen, Guo-Hao Lu, Chun-Jen Weng, Fong-Zhi Chen, Che-Chin Chen, Chih-Ming Wang

引用次数: 0

Joint Experimental and Computational Characterization of Sum-Frequency Generation between a Continuous Wave Laser and an Ultrafast Frequency Comb Laser for Tunable Laser Development

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-29 DOI: 10.1021/acsphotonics.4c0178310.1021/acsphotonics.4c01783

Jie Zhan, Nicholas D. Cooper and Melanie A. R. Reber*,

{"title":"Joint Experimental and Computational Characterization of Sum-Frequency Generation between a Continuous Wave Laser and an Ultrafast Frequency Comb Laser for Tunable Laser Development","authors":"Jie Zhan, Nicholas D. Cooper and Melanie A. R. Reber*, ","doi":"10.1021/acsphotonics.4c0178310.1021/acsphotonics.4c01783","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01783https://doi.org/10.1021/acsphotonics.4c01783","url":null,"abstract":"Ultrafast optical frequency combs allow for both high spectral and temporal resolution in molecular spectroscopy and have become a powerful tool in many areas of chemistry and physics. Ultrafast lasers and frequency combs generated from ultrafast mode-locked lasers often need to be converted to other wavelengths. Commonly used wavelength conversions are optical parametric oscillators, which require an external optical cavity, and supercontinuum generation combined with optical parametric amplifiers. Whether commercial or home-built, these systems are complex and costly. Here, we investigate an alternative, simple, and easy-to-implement approach to tunable frequency comb ultrafast lasers enabled by new continuous-wave laser technology. Sum-frequency generation between an Nd:YAG continuous-wave laser and a Yb:fiber femtosecond frequency comb in a beta-barium borate (BBO) crystal is explored. The resulting sum-frequency beam is a pulsed frequency comb with the same repetition rate as the Yb:fiber source. SNLO simulation software is used to simulate the results and provide benchmarks for designing future systems to achieve wavelength conversion and tunability in otherwise difficult-to-reach spectral regions.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 2","pages":"786–791 786–791"},"PeriodicalIF":6.5,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsphotonics.4c01783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Joint Experimental and Computational Characterization of Sum-Frequency Generation between a Continuous Wave Laser and an Ultrafast Frequency Comb Laser for Tunable Laser Development

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-29 DOI: 10.1021/acsphotonics.4c01783

Jie Zhan, Nicholas D. Cooper, Melanie A. R. Reber

{"title":"Joint Experimental and Computational Characterization of Sum-Frequency Generation between a Continuous Wave Laser and an Ultrafast Frequency Comb Laser for Tunable Laser Development","authors":"Jie Zhan, Nicholas D. Cooper, Melanie A. R. Reber","doi":"10.1021/acsphotonics.4c01783","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c01783","url":null,"abstract":"Ultrafast optical frequency combs allow for both high spectral and temporal resolution in molecular spectroscopy and have become a powerful tool in many areas of chemistry and physics. Ultrafast lasers and frequency combs generated from ultrafast mode-locked lasers often need to be converted to other wavelengths. Commonly used wavelength conversions are optical parametric oscillators, which require an external optical cavity, and supercontinuum generation combined with optical parametric amplifiers. Whether commercial or home-built, these systems are complex and costly. Here, we investigate an alternative, simple, and easy-to-implement approach to tunable frequency comb ultrafast lasers enabled by new continuous-wave laser technology. Sum-frequency generation between an Nd:YAG continuous-wave laser and a Yb:fiber femtosecond frequency comb in a beta-barium borate (BBO) crystal is explored. The resulting sum-frequency beam is a pulsed frequency comb with the same repetition rate as the Yb:fiber source. SNLO simulation software is used to simulate the results and provide benchmarks for designing future systems to achieve wavelength conversion and tunability in otherwise difficult-to-reach spectral regions.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"39 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodeposited Amorphous WO3 Thin-Film Conductive Filters for Heterojunction Near-Ultraviolet Spectrally Selective Photodetection and Imaging

IF 6.5 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-28 DOI: 10.1021/acsphotonics.4c0220210.1021/acsphotonics.4c02202

Weidong Song*, Jun Wei, Junxing Lv, Huimin Duan, Hainan Qin, Jiaquan Li, Weijia Yang, Bingqian Li and Shuti Li*,

{"title":"Photodeposited Amorphous WO3 Thin-Film Conductive Filters for Heterojunction Near-Ultraviolet Spectrally Selective Photodetection and Imaging","authors":"Weidong Song*, Jun Wei, Junxing Lv, Huimin Duan, Hainan Qin, Jiaquan Li, Weijia Yang, Bingqian Li and Shuti Li*, ","doi":"10.1021/acsphotonics.4c0220210.1021/acsphotonics.4c02202","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02202https://doi.org/10.1021/acsphotonics.4c02202","url":null,"abstract":"Spectrally selective photodetectors (SSPDs) are crucial components in diverse fields, such as telecommunications, environmental surveillance, and medical diagnostics. Typically, these devices rely on external optical filters to selectively detect light within a narrow spectral band. While this scheme is effective, it adds complexity to the system architecture and raises manufacturing costs, which can also potentially lead to a decrease in sensitivity. Alternatively, the formation of heterojunctions between conductive filters and semiconductors can develop SSPDs that not only possess simplified architecture but also exhibit inherent self-filtering capabilities. In this work, we introduce an amorphous WO3/GaN heterojunction ultraviolet SSPD that exhibits a distinct detection peak at 370 nm, with a full width at half-maximum of less than 20 nm. The WO3 thin films were deposited photochemically under ultraviolet light by using a metal chloride precursor. The SSPD offers excellent photodetection performance, with a high photo-to-dark current ratio of 6.19 × 104, a high responsivity of 495 mA/W, and an excellent specific detectivity of up to 3.31 × 1011 Jones at −5 V, all of which are significantly improved compared to the crystalline WO3/GaN device. Additionally, our SSPD shows promise for selective imaging applications within the near-UV spectrum.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"12 2","pages":"1075–1083 1075–1083"},"PeriodicalIF":6.5,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodeposited Amorphous WO3 Thin-Film Conductive Filters for Heterojunction Near-Ultraviolet Spectrally Selective Photodetection and Imaging

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-28 DOI: 10.1021/acsphotonics.4c02202

Weidong Song, Jun Wei, Junxing Lv, Huimin Duan, Hainan Qin, Jiaquan Li, Weijia Yang, Bingqian Li, Shuti Li

{"title":"Photodeposited Amorphous WO3 Thin-Film Conductive Filters for Heterojunction Near-Ultraviolet Spectrally Selective Photodetection and Imaging","authors":"Weidong Song, Jun Wei, Junxing Lv, Huimin Duan, Hainan Qin, Jiaquan Li, Weijia Yang, Bingqian Li, Shuti Li","doi":"10.1021/acsphotonics.4c02202","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02202","url":null,"abstract":"Spectrally selective photodetectors (SSPDs) are crucial components in diverse fields, such as telecommunications, environmental surveillance, and medical diagnostics. Typically, these devices rely on external optical filters to selectively detect light within a narrow spectral band. While this scheme is effective, it adds complexity to the system architecture and raises manufacturing costs, which can also potentially lead to a decrease in sensitivity. Alternatively, the formation of heterojunctions between conductive filters and semiconductors can develop SSPDs that not only possess simplified architecture but also exhibit inherent self-filtering capabilities. In this work, we introduce an amorphous WO3/GaN heterojunction ultraviolet SSPD that exhibits a distinct detection peak at 370 nm, with a full width at half-maximum of less than 20 nm. The WO3 thin films were deposited photochemically under ultraviolet light by using a metal chloride precursor. The SSPD offers excellent photodetection performance, with a high photo-to-dark current ratio of 6.19 × 104, a high responsivity of 495 mA/W, and an excellent specific detectivity of up to 3.31 × 1011 Jones at −5 V, all of which are significantly improved compared to the crystalline WO3/GaN device. Additionally, our SSPD shows promise for selective imaging applications within the near-UV spectrum.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"120 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Portable Acoustic Holographic Optical Waveguide Device for Phototherapy

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2025-01-27 DOI: 10.1021/acsphotonics.4c02189

Runyu Wang, Qibo Lin, Zhaoxi Li, Xiongwei Wei, Chenxue Hou, Han Shan, Xiaofei Luo, Xize Yu, Zeyu Chen, Xiheng Hu, Chunlong Fei

{"title":"Portable Acoustic Holographic Optical Waveguide Device for Phototherapy","authors":"Runyu Wang, Qibo Lin, Zhaoxi Li, Xiongwei Wei, Chenxue Hou, Han Shan, Xiaofei Luo, Xize Yu, Zeyu Chen, Xiheng Hu, Chunlong Fei","doi":"10.1021/acsphotonics.4c02189","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c02189","url":null,"abstract":"Photodynamic therapy and photothermal therapy have emerged as indispensable modalities to treat diseases. However, their efficacy is hindered by the substantial light scattering within tissues, preventing light transmission effectively to targeted lesion sites. Various existing devices aimed at mitigating light scattering typically exhibit invasiveness and complexity. In this work, we propose an approach that utilizes a portable acoustic holographic optical waveguide device to mitigate light scattering by manipulating the refractive index within tissues. This manipulation allows in situ modulation of scattered light, thereby promoting the concentration of photon energy. We demonstrated that the device can mitigate light scattering in a medium through simulation and optical imaging experiments. Second, we demonstrated in both photothermal and photodynamic experiments that the device can enhance the rate of temperature rise in the medium and the rate of singlet oxygen (1O2) generation, respectively. It is foreseeable that this versatility in overcoming light scattering can augment the outcomes of phototherapy, offering a noninvasive, portable, and robust method.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":"24 1","pages":""},"PeriodicalIF":7.0,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0