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Optical metasurfaces:fundamentals and applications

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Photonics Research 2023年第5期11卷 I0004-I0006页

作者： THOMAS PERTSCH shumin xiao ARKA MAJUMDAR GUIXIN LI Friedrich-Schiller-Universität Jena 07737 JenaGermany Harbin Institute of Technology(Shenzhen) Shenzhen 518055China University of Washington SeattleWashington 98195USA Southern University of Science and Technology Shenzhen 518055China

Optical metasurfaces are currently an important research area all around the world because of their wide application opportunities in imaging,wavefront engineering,nonlinear optics,quantum information processing,just to name a few.The feature issue“Optical Metasurfaces:Fundamentals and Applications”in Photonics Research allows for archival publication of the most recent works in optical metasurface and provides for broad dissemination in the photonics community.

关键词： surfaces optics quantum

Lanthanide-doped nanocrystals in high-Q microtoroids for stable on-chip white-light lasers

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Photonics Research 2022年第7期10卷 1594-1601页

作者： LIMIN JIN ZHUO LIU YUQI ZHANG YUNKAI WU YILIN LIU HUACHUN DENG QINGHAI SONG shumin xiao Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Pengcheng Laboratory Shenzhen 518055China

The plentiful energy states of lanthanide(Ln^(3+))-doped nanomaterials make them very promising for on-chip integrated white-light lasers.Despite the rapid progresses,the Ln^(3+)-based white upconversion emissions are strongly restricted by their low upconversion quantum efficiency and the color stability.Herein,we combine the CaF_(2):Yb_(35)Tm_(1.5)Er_(0.5)nanocrystals and the high-Q microtoroids,and experimentally demonstrate the chip-integrated stable white-light laser.By optimizing the sizes,density,and distributions of Ln^(3+)-doped nanocrystals,the Q factors of Ln^(3+)-doped microtoroids are maintained as high as 5×10^(5).The strong light matter interaction in high-Q microtoroids greatly enhances the upconversion emission and dramatically reduces the laser thresholds at 652 nm,545 nm,and 475 nm to similarly low values(1.89-2.10 m J cm^(-2)).Consequently,robust white-light microlaser has been experimentally achieved from a single microtoroid.This research has paved a solid step toward the chip-scale integrated broadband microlasers.

关键词： stability light Lanthanide

Risk assessment of Giardia in rivers of southern China based on continuous monitoring

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Journal of Environmental Sciences 2012年第2期24卷 309-313页

作者： Wei An Dongqing Zhang shumin xiao Jianwei Yu Min Yang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beifing 100085 China College of Emergency Management -Henan Polytechnic University Jiaozuo 454003 China

The occurrence and risks of Giardia in China have been unclear to date,which has made it difficult to properly manage source water as well as to create reasonable drinking water standards.The levels of Giardia in river networks of several cities in Zhejiang Province,China were found to be in the range of 0-5 oocysts/10 L in the rainy season in 2008.The mortality due to Giardia infection for people in this region was calculated to be from 0 to 1.95 × 10？8 persons using a conditional probability equation.Based on multiple unboiled water intake routes,the disability-adjusted life years（DALYs） due to Giardia infection for people who consumed conventionally treated water was 0.625（95% CI：0.137-2.05） per 105 persons,with the symptom of hospitalization making the highest contribution to total DALYs（0.56 per 105 persons;95% CI：0.122-1.84）.The DALYs decreased to 0.425（95% CI：0.137-2.05） per 105 persons per year for those consuming water treated with advanced technology.These values were lower than the acceptable risk（1.97 × 10？5 DALYs per year）.This study revealed the risk of Giardia infection to the people in river networks of Zhejiang Province for the first time,and provides a method to evaluate the risk of Giardia infection.The results are useful for the modification of drinking water quality standards based on cost-benefit analysis.

关键词： Giardia risk assessment water consumption disability-adjusted life years

Risk assessment of Giardia from a full scale MBR sewage treatment plant caused by membrane integrity failure

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Journal of Environmental Sciences 2015年第4期27卷 252-258页

作者： Yu Zhang Zhimin Chen Wei An shumin xiao Hongying Yuan Dongqing Zhang Min Yang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Tianjin Key Laboratory of Aquatic Science and Technology Tianjin Chengjian University

Membrane bioreactors（MBR） are highly efficient at intercepting particles and microbes and have become an important technology for wastewater reclamation. However, many pathogens can accumulate in activated sludge due to the long residence time usually adopted in MBR, and thus may pose health risks when membrane integrity problems occur.This study presents data from a survey on the occurrence of water-borne Giardia pathogens in reclaimed water from a full-scale wastewater treatment plant with MBR experiencing membrane integrity failure, and assessed the associated risk for green space irrigation. Due to membrane integrity failure, the MBR effluent turbidity varied between 0.23 and 1.90 NTU over a period of eight months. Though this turbidity level still met reclaimed water quality standards（≤ 5 NTU）, Giardia were detected at concentrations of 0.3 to 95 cysts/10 L, with a close correlation between effluent turbidity and Giardia concentration. All β-giardin gene sequences of Giardia in the WWTP influents were genotyped as Assemblages A and B, both of which are known to infect humans. An exponential dose–response model was applied to assess the risk of infection by Giardia. The risk in the MBR effluent with chlorination was9.83 × 10-3, higher than the acceptable annual risk of 1.0 × 10^-4. This study suggested that membrane integrity is very important for keeping a low pathogen level, and multiple barriers are needed to ensure the biological safety of MBR effluent.

关键词： Giardia Reclaimed water Water quality Risk Genotype

Time-sequential color code division multiplexing holographic display with metasurface

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Opto-Electronic Advances 2023年第8期6卷 8-16页

作者： Xin Li Qinmiao Chen Xue Zhang Ruizhe Zhao shumin xiao Yongtian Wang Lingling Huang Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China MoE Key Laboratory of Photoelectronic Imaging Technology and System and MIIT Key Laboratory of Photonics Information TechnologySchool of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemHarbin Institute of Technology(Shenzhen)Shenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Color metasurface holograms are powerful and versatile platforms for modulating the amplitude,phase,polarization,and other properties of light at multiple operating wavelengths.However,the current color metasurface holography can only realize static manipulation.In this study,we propose and demonstrate a multiplexing metasurface technique combined with multiwavelength code-division multiplexing(CDM)to realize dynamic manipulation.Multicolor code references are utilized to record information within a single metasurface and increase the information capacity and security for anticracks.A total of 48 monochrome images consisting of pure color characters and multilevel color video frames were reconstructed in dual polarization channels of the birefringent metasurface to exhibit high information density,and a video was displayed via sequential illumination of the corresponding code patterns to verify the ability of dynamic manipulation.Our approach demonstrates significant application potential in optical data storage,optical encryption,multiwavelengthversatile diffractive optical elements,and stimulated emission depletion microscopy.

关键词： metasurface color holography dynamic display code division multiplexing

A platform for integrated spectrometers based on solution-processable semiconductors

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Light(Science & Applications) 2023年第9期12卷 1739-1748页

作者： Yanhao Li Xiong Jiang Yimu Chen Yuhan Wang Yunkai Wu De Yu Kaiyang Wang Sai Bai shumin xiao Qinghai Song Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of Technology(Shenzhen)ShenzhenGuangdong 518055China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 611731China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShan`xi 030006China

Acquiring real-time spectral information in point-of-care diagnosis,internet-of-thing,and other lab-on-chip applications require spectrometers with hetero-integration capability and miniaturized feature.Compared to conventional semiconductors integrated by heteroepitaxy,solution-processable semiconductors provide a much-flexible integration platform due to their solution-processability,and,therefore,more suitable for the multi-material integrated system.However,solution-processable semiconductors are usually incompatible with the micro-fabrication processes.This work proposes a facile and universal platform to fabricate integrated spectrometers with semiconductor substitutability by unprecedently involving the conjugated mode of the bound states in the continuum(conjugated-BIC)photonics.Specifically,exploiting the conjugated-BIC photonics,which remains unexplored in conventional lasing studies,renders the broadband photodiodes with ultra-narrowband detection ability,detection wavelength tunability,and on-chip integration ability while ensuring the device performance.Spectrometers based on these ultra-narrowband photodiode arrays exhibit high spectral resolution and wide/tunable spectral bandwidth.The fabrication processes are compatible with solution-processable semiconductors photodiodes like perovskites and quantum dots,which can be potentially extended to conventional semiconductors.Signals from the spectrometers directly constitute the incident spectra without being computation-intensive,latency-sensitive,and error-intolerant.As an example,the integrated spectrometers based on perovskite photodiodes are capable of realizing narrowband/broadband light reconstruction and in-situ hyperspectral imaging.

关键词： semiconductors process integration

Arbitrary polarization conversion dichroism metasurfaces for all-in-one full Poincare sphere polarizers

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Light(Science & Applications) 2021年第2期10卷 208-216页

作者： Shuai Wang Zi-Lan Deng Yujie Wang Qingbin Zhou xiaolei Wang Yaoyu Cao Bai-Ou Guan shumin xiao Xiangping Li Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan University510632 GuangzhouChina Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology518055 ShenzhenChina Institute of Modern Optics Nankai University300350 TianjinChina

The control of polarization,an essential property of light,is of broad scientific and technological interest.Polarizers are indispensable optical elements for direct polarization generation.However,arbitrary polarization generation,except that of common linear and circular polarization,relies heavily on bulky optical components such as cascading linear polarizers and waveplates.Here,we present an effective strategy for designing all-in-one full Poincare sphere polarizers based on perfect arbitrary polarization conversion dichroism and implement it in a monolayer all-dielectric metasurface.This strategy allows preferential transmission and conversion of one polarization state located at an arbitrary position on the Poincare sphere to its handedness-flipped state while completely blocking its orthogonal state.In contrast to previous methods that were limited to only linear or circular polarization,our method manifests perfect dichroism of nearly 100%in theory and greater than 90%experimentally for arbitrary polarization states.By leveraging this attractive dichroism,our demonstration of the generation of polarization beams located at an arbitrary position on a Poincare sphere directly from unpolarized light can substantially extend the scope of meta-optics and dramatically promote state-of-the-art nanophotonic devices.

关键词： surface. Poincare arbitrary

光子学中与连续域束缚态相关的手性现象(特邀)

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光学学报 2024年第10期44卷 171-186页

作者：杜康曾益轩欧阳旭张旭东肖淑敏宋清海哈尔滨工业大学微纳光电信息系统理论与技术工信部重点实验室广东深圳518055 鹏城实验室广东深圳518055

快速发展的超构表面具有较强的光场操控能力,然而要在该平台实现强手性光学效应始终面临挑战。超构表面中的连续域束缚态(BIC)是一类在辐射连续域内被完全束缚的特殊本征态,它不仅具有更强的光场局域能力,还能带来诸多有趣的物理现象,... 详细信息

快速发展的超构表面具有较强的光场操控能力,然而要在该平台实现强手性光学效应始终面临挑战。超构表面中的连续域束缚态(BIC)是一类在辐射连续域内被完全束缚的特殊本征态,它不仅具有更强的光场局域能力,还能带来诸多有趣的物理现象,这为实现最大手性光学响应带来了新的机遇。首先简要回顾了BIC在光子学中的发展过程,随后主要围绕手性BIC的产生及相关特性进行讨论,接着补充介绍了几种与BIC相关的其他光学手性现象,最后针对手性BIC的潜在应用领域和现有挑战进行了总结。光子学中诸多关于手性BIC的最新研究为设计性能卓越的低功耗、小型光电子器件提供了全新的可能途径。

关键词：物理光学连续域束缚态光学手性超构表面对称性动量空间

Suppressing meta-holographic artifacts by laser coherence tuning

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Light(Science & Applications) 2021年第7期10卷 1236-1246页

作者： Yaniv Eliezer Geyang Qu Wenhong Yang Yujie Wang Hasan Yılmaz shumin xiao Qinghai Song Hui Cao Department of Applied Physics Yale UniversityNew HavenCT 06520USA Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology(Shenzhen)Shenzhen 518055P.R.China

A metasurface hologram combines fine spatial resolution and large viewing angles with a planar form factor and compact size.However,it suffers coherent artifacts originating from electromagnetic cross-talk between closely packed meta-atoms and fabrication defects of nanoscale features.Here,we introduce an efficient method to suppress all artifacts by fine-tuning the spatial coherence of illumination.Our method is implemented with a degenerate cavity laser,which allows a precise and continuous tuning of the spatial coherence over a wide range,with little variation in the emission spectrum and total power.We find the optimal degree of spatial coherence to suppress the coherent artifacts of a meta-hologram while maintaining the image sharpness.This work paves the way to compact and dynamical holographic displays free of coherent defects.

关键词： holographic coherent illumination