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| 1 | Electro-optic lithium niobate metasurfaces显示文摘Many applications of metasurfaces require an ability to dynamically change their properties in the time domain. Electrical tuning techniques are of particular interest, since they pave a way to on-chip integration of metasurfaces with optoelectronic devices.In this work, we propose and experimentally demonstrate an electro-optic lithium niobate(EO-LN) metasurface that shows dynamic modulations to phase retardation of transmitted light. Quasi-bound states in the continuum(QBIC) are observed from this metasurface. By applying external electric voltages, the refractive index of lithium niobate(LN) is changed by Pockels EO nonlinearity, leading to efficient phase modulations to the transmitted light around the QBIC wavelength. The EO-LN metasurface developed in this study opens up new routes for potential applications in the field of displaying, pulse shaping, and spatial light modulating. | BoFeng Gao MengXin Ren Wei Wu Wei Cai JingJun Xu | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，4： | 3 |
| 2 | All-optical modulation of quantum states by nonlinear metasurface显示文摘Metasurfaces have proven themselves an exotic ability to harness light at nano-scale,being important not only for classical but also for quantum optics.Dynamic manipulation of the quantum states is at the heart of quantum information processing;however,such function has been rarely realized with metasurfaces so far.Here,we report an all-optical dynamic modulation of the photonic quantum states using the nonlinear metasurface.The metasurface consists of a metallic nanostructure combined with a photoisomerizable azo layer.By tuning the plasmonic resonance through optically switching the azo molecules between their binary isomeric states,we have realized dynamic control of transmission efficiencies of orthogonally polarized photons and also the phase delay between them,thereby an entangled state was efficiently controlled.As an illustration,a quantum state distillation has been demonstrated to recover a Bell state from a non-maximally entangled one to that with fidelities higher than 98%.Our work would enrich the functions of the metasurface in the quantum world,from static to dynamic modulation,making the quantum metasurface going practical. | Di Zhang Yang Chen Shengchao Gong Wei Wu Wei Cai Mengxin Ren Xifeng Ren Shuang Zhang Guangcan Guo Jingjun Xu | 2022 | Light(Science & Applications)2022，11，3： | 1 |
| 3 | Machine learning powered ellipsometry显示文摘Ellipsometry is a powerful method for determining both the optical constants and thickness of thin films.For decades,solutions to ill-posed inverse ellipsometric problems require substantial human-expert intervention and have become essentially human-in-the-loop trial-and-error processes that are not only tedious and time-consuming but also limit the applicability of ellipsometry.Here,we demonstrate a machine learning based approach for solving ellipsometric problems in an unambiguous and fully automatic manner while showing superior performance.The proposed approach is experimentally validated by using a broad range of films covering categories of metals,semiconductors,and dielectrics.This method is compatible with existing ellipsometers and paves the way for realizing the automatic,rapid,high-throughput optical characterization of films. | Jinchao Liu Di Zhang Dianqiang Yu Mengxin Ren Jingjun Xu | 2021 | Light(Science & Applications)2021，10，4： | 1 |
| 4 | Comparative analyses of aging-related genes in long-lived mammals provide insights into natural longevity显示文摘Extreme longevity has evolved multiple times during the evolution of mammals,yet its underlying molecular mechanisms remain largely underexplored.Here,we compared the evolution of 115 aging-related genes in 11 long-lived species and 25 mammals with non-increased lifespan(control group)in the hopes of better understanding the common molecular mechanisms behind longevity.We identified 16 unique positively selected genes and 23 rapidly evolving genes in long-lived species,which included nine genes involved in regulating lifespan through the insulin/IGF-1 signaling(IIS)pathway and 11 genes highly enriched in immune-response-related pathways,suggesting that the IIS pathway and immune response play a particularly important role in exceptional mammalian longevity.Interestingly,11 genes related to cancer progression,including four positively selected genes and seven genes with convergent amino acid changes,were shared by two or more long-lived lineages,indicating that long-lived mammals might have evolved convergent or similar mechanisms of cancer resistance that extended their lifespan.This suggestion was further corroborated by our identifi-cation of 12 robust candidates for longevity-related genes closely related to cancer. | Zhenpeng Yu Inge Seim Mengxin Yin Ran Tian Di Sun Wenhua Ren Guang Yang Shixia Xu | 2021 | The Innovation2021，2，2： | 1 |
| 5 | Optically addressed spatial light modulator based on nonlinear metasurface显示文摘Spatial light modulators(SLMs)are devices for modulating amplitude,phase,or polarization of light beams on demand.Such devices are regarded as the backbone for optical information parallel processing and future optical computers.Currently,SLMs are mainly operated in an electrical addressing manner,wherein the optical beams are modulated by electrical signals.However,future all-optical information processing systems prefer to control light directly by light(i.e.,optically addressed,OA)without electro-optical conversion.Here,we present an OASLM based on a metasurface(MS-OASLM),whose operation principle relies on nonlinear polarization control of read light by another write light at the nanoscale.Its resolution is more than 10 times higher than a typical commercial SLM and achieves 500 line pairs per millimeter(corresponding to a pixel size of only 1μm).The MS-OASLM shows unprecedented compactness and is only 400 nm in thickness.Such MS-OASLMs could provide opportunities to develop next generation all-optical information processing and high resolution display technologies. | Shengchao Gong Mengxin Ren Wei Wu Wei Cai Jingjun Xu | 2021 | Photonics Research2021，9，4： | 0 |
| 6 | Intelligent metasurfaces can recognize objects显示文摘An on-chip optical neural network is built using metasurfaces, which can recognize objects with high accuracy. | Mengxin Ren Jingjun Xu | 2022 | Light(Science & Applications)2022，11，8： | 0 |
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