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  1. Article ; Online: Metasurface designed with quantitative field distributions.

    Wang, Shuai / Yang, Yuanmu

    Light, science & applications

    2023  Volume 12, Issue 1, Page(s) 114

    Abstract: A new method for designing metasurfaces has been proposed and demonstrated, which allows for the generation of precise quantitative field distributions. This unique approach involves combining a tandem neural network with an iterative algorithm to ... ...

    Abstract A new method for designing metasurfaces has been proposed and demonstrated, which allows for the generation of precise quantitative field distributions. This unique approach involves combining a tandem neural network with an iterative algorithm to optimize the metasurface design, enabling accurate control over the intensity and polarization of the resulting field. This strategy is both efficient and robust and has the potential to accelerate the development of metasurface devices with complex functionalities.
    Language English
    Publishing date 2023-05-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2662628-7
    ISSN 2047-7538 ; 2047-7538
    ISSN (online) 2047-7538
    ISSN 2047-7538
    DOI 10.1038/s41377-023-01155-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Metasurface array for single-shot spectroscopic ellipsometry.

    Wen, Shun / Xue, Xinyuan / Wang, Shuai / Ni, Yibo / Sun, Liqun / Yang, Yuanmu

    Light, science & applications

    2024  Volume 13, Issue 1, Page(s) 88

    Abstract: Spectroscopic ellipsometry is a potent method that is widely adopted for the measurement of thin film thickness and refractive index. Most conventional ellipsometers utilize mechanically rotating polarizers and grating-based spectrometers for ... ...

    Abstract Spectroscopic ellipsometry is a potent method that is widely adopted for the measurement of thin film thickness and refractive index. Most conventional ellipsometers utilize mechanically rotating polarizers and grating-based spectrometers for spectropolarimetric detection. Here, we demonstrated a compact metasurface array-based spectroscopic ellipsometry system that allows single-shot spectropolarimetric detection and accurate determination of thin film properties without any mechanical movement. The silicon-based metasurface array with a highly anisotropic and diverse spectral response is combined with iterative optimization to reconstruct the full Stokes polarization spectrum of the light reflected by the thin film with high fidelity. Subsequently, the film thickness and refractive index can be determined by fitting the measurement results to a proper material model with high accuracy. Our approach opens up a new pathway towards a compact and robust spectroscopic ellipsometry system for the high throughput measurement of thin film properties.
    Language English
    Publishing date 2024-04-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 2662628-7
    ISSN 2047-7538 ; 2047-7538
    ISSN (online) 2047-7538
    ISSN 2047-7538
    DOI 10.1038/s41377-024-01396-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Efficient second- and higher-order harmonic generation from LiNbO

    Zhao, Yun / Chen, Zhaoxi / Wang, Cheng / Yang, Yuanmu / Sun, Hong-Bo

    Nanoscale

    2023  Volume 15, Issue 31, Page(s) 12926–12932

    Abstract: Lithium niobate ( ... ...

    Abstract Lithium niobate (LiNbO
    Language English
    Publishing date 2023-08-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d3nr02430j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Single-shot deterministic complex amplitude imaging with a single-layer metalens.

    Li, Liu / Wang, Shuai / Zhao, Feng / Zhang, Yixin / Wen, Shun / Chai, Huichao / Gao, Yunhui / Wang, Wenhui / Cao, Liangcai / Yang, Yuanmu

    Science advances

    2024  Volume 10, Issue 1, Page(s) eadl0501

    Abstract: Conventional imaging systems can only capture light intensity. Meanwhile, the lost phase information may be critical for a variety of applications such as label-free microscopy and optical metrology. Existing phase retrieval techniques typically require ... ...

    Abstract Conventional imaging systems can only capture light intensity. Meanwhile, the lost phase information may be critical for a variety of applications such as label-free microscopy and optical metrology. Existing phase retrieval techniques typically require a bulky setup, multiframe measurements, or prior information of the target scene. Here, we proposed an extremely compact system for complex amplitude imaging, leveraging the extreme versatility of a single-layer metalens to generate spatially multiplexed and polarization phase-shifted point spread functions. Combining the metalens with a polarization camera, the system can simultaneously record four polarization shearing interference patterns along both in-plane directions, thus allowing the deterministic reconstruction of the complex amplitude light field in a single shot. Using an incoherent light-emitting diode as the illumination, we experimentally demonstrated speckle-noise-free complex amplitude imaging for both static and moving objects with tailored magnification ratio and field of view. The miniaturized and robust system may open the door for complex amplitude imaging in portable devices for point-of-care applications.
    Language English
    Publishing date 2024-01-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.adl0501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Monocular metasurface camera for passive single-shot 4D imaging.

    Shen, Zicheng / Zhao, Feng / Jin, Chunqi / Wang, Shuai / Cao, Liangcai / Yang, Yuanmu

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 1035

    Abstract: It is a grand challenge for an imaging system to simultaneously obtain multi-dimensional light field information, such as depth and polarization, of a scene for the accurate perception of the physical world. However, such a task would conventionally ... ...

    Abstract It is a grand challenge for an imaging system to simultaneously obtain multi-dimensional light field information, such as depth and polarization, of a scene for the accurate perception of the physical world. However, such a task would conventionally require bulky optical components, time-domain multiplexing, and active laser illumination. Here, we experimentally demonstrate a compact monocular camera equipped with a single-layer metalens that can capture a 4D image, including 2D all-in-focus intensity, depth, and polarization of a target scene in a single shot under ambient illumination conditions. The metalens is optimized to have a conjugate pair of polarization-decoupled rotating single-helix point-spread functions that are strongly dependent on the depth of the target object. Combined with a straightforward, physically interpretable image retrieval algorithm, the camera can simultaneously perform high-accuracy depth sensing and high-fidelity polarization imaging over an extended depth of field for both static and dynamic scenes in both indoor and outdoor environments. Such a compact multi-dimensional imaging system could enable new applications in diverse areas ranging from machine vision to microscopy.
    Language English
    Publishing date 2023-02-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-36812-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Metalens for Accelerated Optoelectronic Edge Detection under Ambient Illumination.

    Wang, Shuai / Li, Liu / Wen, Shun / Liang, Ruiqi / Liu, Yaxi / Zhao, Feng / Yang, Yuanmu

    Nano letters

    2023  Volume 24, Issue 1, Page(s) 356–361

    Abstract: Analog systems may allow image processing, such as edge detection, with low computational power. However, most demonstrated analog systems, based on either conventional 4- ...

    Abstract Analog systems may allow image processing, such as edge detection, with low computational power. However, most demonstrated analog systems, based on either conventional 4-
    Language English
    Publishing date 2023-12-18
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c04112
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Metasurface-Based Solid Poincaré Sphere Polarizer.

    Wang, Shuai / Wen, Shun / Deng, Zi-Lan / Li, Xiangping / Yang, Yuanmu

    Physical review letters

    2023  Volume 130, Issue 12, Page(s) 123801

    Abstract: The combination of conventional polarization optical elements, such as linear polarizers and waveplates, is widely adopted to tailor light's state of polarization (SOP). Meanwhile, less attention has been given to the manipulation of light's degree of ... ...

    Abstract The combination of conventional polarization optical elements, such as linear polarizers and waveplates, is widely adopted to tailor light's state of polarization (SOP). Meanwhile, less attention has been given to the manipulation of light's degree of polarization (DOP). Here, we propose metasurface-based polarizers that can filter unpolarized incident light to light with any prescribed SOP and DOP, corresponding to arbitrary points located both at the surface and within the solid Poincaré sphere. The Jones matrix elements of the metasurface are inverse-designed via the adjoint method. As prototypes, we experimentally demonstrated metasurface-based polarizers in near-infrared frequencies that can convert unpolarized light into linear, elliptical, or circular polarizations with varying DOPs of 1, 0.7, and 0.4, respectively. Our Letter unlocks a new degree of freedom for metasurface polarization optics and may break new ground for a variety of DOP-related applications, such as polarization calibration and quantum state tomography.
    Language English
    Publishing date 2023-04-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.123801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  8. Article ; Online: Highly Tunable Cascaded Metasurfaces for Continuous Two-Dimensional Beam Steering.

    Zhang, Lingyun / Zhang, Li / Xie, Rongbo / Ni, Yibo / Wu, Xiaoyu / Yang, Yuanmu / Xing, Fei / Zhao, Xiaoguang / You, Zheng

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2023  Volume 10, Issue 24, Page(s) e2300542

    Abstract: Cascaded metasurfaces can exhibit powerful dynamic light manipulation by mechanically tuning the far-field interactions in the layers. However, in most current designs, the metasurfaces are separated by gaps smaller than a wavelength to form a total ... ...

    Abstract Cascaded metasurfaces can exhibit powerful dynamic light manipulation by mechanically tuning the far-field interactions in the layers. However, in most current designs, the metasurfaces are separated by gaps smaller than a wavelength to form a total phase profile, representing the direct accumulation of the phase profiles of each layer. Such small gap sizes may not only conflict with the far-field conditions but also pose great difficulties for practical implementations. To overcome this limitation, a design paradigm taking advantage of a ray-tracing scheme that allows the cascaded metasurfaces to operate optimally at easily achievable gap sizes is proposed. Enabled by the relative lateral translation of two cascaded metasurfaces, a continuous two-dimensional (2D) beam-steering device for 1064 nm light is designed as a proof of concept. Simulation results demonstrate tuning ranges of ±45° for biaxial deflection angles within ±3.5 mm biaxial translations, while keeping the divergence of deflected light less than 0.007°. The experimental results agree well with theoretical predictions, and a uniform optical efficiency is observed. The  generializeddesign paradigm can pave a way towards myriad tunable cascaded metasurface devices for various applications, including but not limited to light detection and ranging (LiDAR) and free space optical communication.
    Language English
    Publishing date 2023-06-20
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202300542
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Non-Invasive and Minute-Frequency 3D Tomographic Imaging Enabling Long-Term Spatiotemporal Observation of Single Cell Fate.

    Liang, Fei / Zhu, Junwen / Chai, Huichao / Feng, Yongxiang / Zhao, Peng / Liu, Shaofeng / Yang, Yuanmu / Lin, Linhan / Cao, Liangcai / Wang, Wenhui

    Small methods

    2023  Volume 7, Issue 7, Page(s) e2201492

    Abstract: Non-invasive and rapid imaging technique at subcellular resolution is significantly important for multiple biological applications such as cell fate study. Label-free refractive-index (RI)-based 3D tomographic imaging constitutes an excellent candidate ... ...

    Abstract Non-invasive and rapid imaging technique at subcellular resolution is significantly important for multiple biological applications such as cell fate study. Label-free refractive-index (RI)-based 3D tomographic imaging constitutes an excellent candidate for 3D imaging of cellular structures, but its full potential in long-term spatiotemporal cell fate observation is locked due to the lack of an efficient integrated system. Here, a long-term 3D RI imaging system incorporating a cutting-edge white light diffraction phase microscopy module with spatiotemporal stability, and an acoustofluidic device to roll and culture single cells in a customized live cell culture chamber is reported. Using this system, 3D RI imaging experiments are conducted for 250 cells and demonstrate efficient cell identification with high accuracy. Importantly, long-term and frequency-on-demand 3D RI imaging of K562 and MCF-7 cancer cells reveal different characteristics during normal cell growth, drug-induced cell apoptosis, and necrosis of drug-treated cells. Overall, it is believed that the proposed 3D tomographic imaging technique opens up a new avenue for visualizing intracellular structures and will find many applications such as disease diagnosis and nanomedicine.
    MeSH term(s) Tomography/methods ; Imaging, Three-Dimensional/methods ; Microscopy/methods ; Cell Differentiation ; Apoptosis
    Language English
    Publishing date 2023-03-22
    Publishing country Germany
    Document type Journal Article
    ISSN 2366-9608
    ISSN (online) 2366-9608
    DOI 10.1002/smtd.202201492
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Genetic Diversity and Population Structure Analysis of Castanopsis hystrix and Construction of a Core Collection Using Phenotypic Traits and Molecular Markers

    Li, Na / Yang, Yuanmu / Xu, Fang / Chen, Xinyu / Wei, Ruiyan / Li, Ziyue / Pan, Wen / Zhang, Weihua

    Genes (Basel). 2022 Dec. 16, v. 13, no. 12

    2022  

    Abstract: Castanopsis hystrix is a valuable native, broad-leaved, and fast-growing tree in South China. In this study, 15 phenotypic traits and 32 simple sequence repeat (SSR) markers were used to assess the genetic diversity and population structure of a natural ... ...

    Abstract Castanopsis hystrix is a valuable native, broad-leaved, and fast-growing tree in South China. In this study, 15 phenotypic traits and 32 simple sequence repeat (SSR) markers were used to assess the genetic diversity and population structure of a natural population of C. hystrix and to construct a core germplasm collection by a set of 232 accessions. The results showed that the original population of C. hystrix had relatively high genetic diversity, with the number of alleles (Na), effective number of alleles (Ne), observed heterozygosity (Ho), expected heterozygosity (He), Shannon’s information index (I), and polymorphism information content (PIC) averaging at 26.188, 11.565, 0.863, 0.897, 2.660, and 0.889, respectively. Three sub-populations were identified based on a STRUCTURE analysis, indicating a strong genetic structure. The results from the phylogenetic and population structures showed a high level of agreement, with 232 germplasms being classified into three main groups. The analysis of molecular variance (AMOVA) test indicated that 96% of the total variance was derived from within populations, which revealed a low differentiation among populations. A core collection composed of 157 germplasms was firstly constructed thereafter, of which the diversity parameters non-significantly differed from the original population. These results revealed the genetic diversity and population structure of C. hystrix germplasms, which have implications for germplasm management and genome-wide association studies on C. hystrix, as well as for core collection establishment applications in other wood-producing hardwood species.
    Keywords Castanopsis purpurella ; genetic structure ; genetic variation ; germplasm ; germplasm conservation ; hardwood ; heterozygosity ; microsatellite repeats ; phenotype ; phylogeny ; population structure ; trees ; variance ; China
    Language English
    Dates of publication 2022-1216
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article ; Online
    ZDB-ID 2527218-4
    ISSN 2073-4425
    ISSN 2073-4425
    DOI 10.3390/genes13122383
    Database NAL-Catalogue (AGRICOLA)

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