Article
Optics
Yang Shu, Wenchen Zhou, Zhixiong Zhou, Allen Y. Yi
Summary: In this study, a rapid non-isothermal imprinting process for Fresnel lens arrays was proposed, which can be carried out at room temperature to greatly reduce thermal cycle time and energy consumption. The process allows for production of high-quality microlenses with a high precision surface finish.
Article
Nanoscience & Nanotechnology
Zhipeng Wang, Lan Jiang, Xiaowei Li, Shuai Gao, Shipeng Zhou, Yang Liu, Lingling Huang, Jiangang Lu, Jiangang Yin
Summary: This paper discusses a high efficiency method for fabricating ultrathin FZPs of different scales on metal films using holographic femtosecond lasers. The study demonstrates the capability of cross-scale fabrication and presents the excellent imaging ability of the fabricated FZPs in the visible spectrum.
Article
Computer Science, Software Engineering
Kiseung Bang, Youngjin Jo, Minseok Chae, Byoungho Lee
Summary: The paper introduces a new thin and flat virtual reality display using a Fresnel lenslet array and optical folding technique, with wide field of view and eye-box, and compact form factor. The precise design of the lens reduces production cost, and experimental verification confirms the system performance.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2021)
Article
Acoustics
Jeffrey K. Woodacre, Matthew Mallay, Jeremy A. Brown
Summary: This study built two single-element therapeutic ultrasound transducers for small animal histotripsy applications, consisting of 8mm focal depth, 6 MHz PZT-5A 40% volume fraction 1-3 composite Fresnel aluminum lens. One device had a central hole for future co-registration and the other was full-aperture. Epoxy fill on the front face of the device resulted in a 6% loss of focal pressure. The full-aperture device achieved peak-to-peak focal pressures of 37 MPa/100 V, while the device with the removed center element achieved a 32% reduction at 25 MPa/100V.
Article
Optics
Guohan Gao, Heng Shi, Lihua Wang, Dun Liu, Jiong Wang, Junfeng Du, Jiang Bian, Bin Fan, Hu Yang
Summary: This study focuses on large aperture high diffraction efficiency off-axis Fresnel lens and presents the fabrication of a 4-level off-axis Fresnel lens with high diffraction efficiency. The influence of alignment errors on the diffraction efficiency distribution is analyzed and discussed.
Article
Automation & Control Systems
Songtao Meng, Ziqiang Yin, Senbin Xia, Jianhua Yao, Jianwen Zhang
Summary: In the R2R manufacturing of optical films, machining the microstructure on the roller mold is crucial, and a new machining method called diamond micro-scraping (DMS) combined with the polygonal Fresnel lens structure array characteristics provides a possible solution. Tool path planning and simulation analysis were based on the layout of the polygonal Fresnel structure array, and the machining performance of DMS was evaluated by studying the influence of different materials and machining parameters on the machined surface quality. This proposed method guides the design and precision manufacturing of the Fresnel lens structure array on precision rollers.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Optics
Chenchu Zhang, Hanchang Ye, Rui Cao, Shengyun Ji, Heng Zhang, Linhan Zhao, Sizhu Wu, Hua Zhai
Summary: In this study, a ring-shaped focus with controllable gaps was proposed by multiplexing the vortex beam and annular beam. The multiplexed beam has advantages such as individual control of diameter and flow energy of the focal point, unaffected by the zero-order beam.
CHINESE OPTICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Peizhao Li, Yu Shi, Yijing Deng, Lei Liu
Summary: This paper reports the design, simulation, and analysis of a THz phased array using lens-coupled annular-slot antennas (ASAs) for wireless communications beyond 5G or 6G. The use of an extended hemispherical silicon lens enables higher antenna gain and efficiency. The results show the potential of this design approach for future wireless communication technologies.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Multidisciplinary
Lin Zhang, Allen Y. Yi, Jiwang Yan
Summary: This paper introduces a novel off-spindle-axis diamond turning method for fabricating Fresnel micro-lens arrays, as well as a micro-lens mold insert for precision glass molding. The experimental results demonstrate that the micro-lens arrays manufactured using this method have homogeneous quality and can be applied in imaging systems.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Shiyu Zhang, Pai Liu, William Whittow
Summary: The hybrid FZL design combines grooved and perforated design methods, improving antenna gain and addressing shadow blockage issues. The design utilizes perforated method for inner regions and grooved method for outer regions, successfully achieving manufacturing of low refractive index regions.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
WenRui Zhang, Lu Cheng, ShiYou Wu, YiCai Ji, Chao Li, Guangyou Fang
Summary: This letter proposes a wideband millimeter wave imaging algorithm that can directly process echo signals in the spatial-frequency domain. The method corrects bulk range cell migration separately in each subareas and performs image processing in the pseudopolar coordinate system, reducing data size and computation load for sparse multiple-input-multiple-output arrays. It also offers superior image quality for large scenes, which is validated through three-dimensional experiments.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Manufacturing
Yanping He, Qi Shao, Shih-Chi Chen, Renjie Zhou
Summary: Two-photon photopolymerization (TPP) is a popular method for fabricating three-dimensional micro- and nanostructures. This study proposes a non-invasive solution using optical diffraction tomography (ODT) to fully characterize TPP-fabricated structures, improving fabrication quality and reproducibility.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Multidisciplinary
Chi Li, Noah Mendelson, Ritika Ritika, YongLiang Chen, Zai-Quan Xu, Milos Toth, Igor Aharonovich
Summary: The fabrication of large-scale arrays of single-photon emitters in hexagonal boron nitride (hBN) shows promising results in isolating single defects and achieving near-unity yield of a single emitter at each pillar site with a diameter of around 250 nm. These results pave the way for scalability and high throughput fabrication of single-photon emitters for advanced quantum photonic applications.
Article
Optics
Jingyu Mo, Xuefeng Chang, Duoji Renqing, Jinpeng Zhang, Longxing Liao, Shanming Luo
Summary: This study presents a novel type of concave lens array on an aspheric convex substrate (CLAACs) composed of an aspheric substrate and a spherical concave subeye array. A method for designing, fabricating, and characterizing the CLAACs is proposed. The results demonstrate the feasibility and effectiveness of this method for designing and fabricating lens arrays with complex discontinuous surfaces.
Article
Engineering, Electrical & Electronic
Alexander Maltsev, Olesya Bolkhovskaya, Valentin Seleznev
Summary: The research introduces a millimeter wave lens-array antenna technology, optimizing system parameters to improve antenna gain and beam steering capability, providing an opportunity for cost-efficient large aperture scanning antennas.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Nianwei Dai, Shunli Liu, Zhongguo Ren, Yang Cao, Jincheng Ni, Dawei Wang, Liang Yang, Yanlei Hu, Jiawen Li, Jiaru Chu, Dong Wu
Summary: Artificial chiral micronanostructures with strong chiroptical signals are significant for next generation photonic devices and chiroptical spectroscopy techniques. However, most of the existing chiral metallic metamaterials generate chiroptical signals dependent on photonic spin angular momentum, while those dependent on photonic orbital angular momentum remain unseen. In this work, copper microhelices with opposite handedness are fabricated using additive manufacturing and their orbital angular momentum-dominated chiroptical response is examined. They exhibit helical dichroism and hold promise in advanced chiroptical spectroscopy and photonic OAM engineering.
Article
Chemistry, Multidisciplinary
Chaowei Wang, Ran Rao, Ze Cai, Haoxiang Yang, Leran Zhang, Shengyun Ji, Chenchu Zhang, Dayong Gao, Yanlei Hu, Jiawen Li, Wei Xiong, Hongyuan Jiang, Jiaru Chu, Dong Wu
Summary: In this study, a microclaw-array was fabricated to mimic the extracellular matrix during cancer cell invasion. Different breast epithelial cells exhibited different migration phenotypes on the microclaw-array, depending on their ability to perceive and respond to the topology of the matrix.
Article
Chemistry, Multidisciplinary
Yubin Peng, Chuanzong Li, Yunlong Jiao, Suwan Zhu, Yanlei Hu, Wei Xiong, Yaoyu Cao, Jiawen Li, Dong Wu
Summary: An active droplet manipulation strategy based on the slippery magnetic responsive micropillar array (SMRMA) is reported in this study. With the aid of a magnetic field, the micropillar array bends and induces the infusing oil to form a moving meniscus, which can attract nearby droplets and transport them for a long range. Moreover, through adjusting the arrangement of the micropillars of SMRMA, multi-functional droplet manipulation such as unidirectional droplet transport, multi-droplet transport, droplet mixing, and droplet screening can be achieved.
Article
Chemistry, Multidisciplinary
Shunli Liu, Xinghao Wang, Jincheng Ni, Yang Cao, Jiawen Li, Chaowei Wang, Yanlei Hu, Jiaru Chu, Dong Wu
Summary: By using designed 3D chiral metahelices, selective transmission management of vortex beams with opposite OAM modes has been demonstrated. This allows for optical operations such as display, hiding, and encryption through parallel processing of multiple vortex beams. The results provide a new approach for the development of photonic angular momentum engineering and high-security optical encryption.
Article
Optics
Jincheng Ni, Shengyun Ji, Zhenyu Wang, Shunli Liu, Yanlei Hu, Yang Chen, Jiawen Li, Xiangping Li, Jiaru Chu, Dong Wu, Cheng-Wei Qiu
Summary: Researchers report an optical control method for unidirectional emission of unpolarized luminescence assisted by photonic orbital angular momenta. The orientation of anti-Stokes shift PL emissions can be controlled by the helicity of incident vortex beams. The experimental directionality of unpolarized PL emission in the one-dimensional nanopillar lattice can reach 0.59, which is significantly stronger than that possible by a spin mechanism. These findings offer a new promising approach for tunable nanoscale optical control of emission.
Article
Optics
Bin Dong, Bingrui Liu, Chao Chen, Dawei Wang, Leran Zhang, Liqun Xu, Wei Xiong, Jiawen Li, Yanlei Hu, Jiaru Chu, Dong Wu
Summary: Structural color (SC) has great potential for information encryption and intelligent sensing, but direct writing of SCs at the micro/nano scale and color change in response to external stimuli is challenging. This study used femtosecond laser two-photon polymerization (fs-TPP) to directly print woodpile structures (WSs), showing obvious SCs under an optical microscope. The change of SCs was achieved by transferring WSs between different mediums. The influence of laser power, structural parameters, and mediums on SCs was systematically investigated, and the mechanism of SCs was explored using the finite-difference time-domain (FDTD) method. Reversible encryption and decryption of specific information were realized, holding broad application prospects in smart sensing, anti-counterfeiting tags, and advanced photonic devices.
Article
Chemistry, Multidisciplinary
Junhan Hu, Yubin Peng, Yucheng Bian, Kexiang Shao, Zehang Cui, Yuxuan Zhang, Yanlei Hu, Jiawen Li, Dong Wu, Yachao Zhang, Shaojun Jiang
Summary: By designing a magnetocontrollable lubricant-infused microwall array (MLIMA), this work solves critical limitations in droplet transportation and demonstrates passive/active bidirectional droplet transport capabilities. It shows great potential in chemical microreactions, bioassays, and the medical field.
Article
Physics, Applied
Xin Li, Zhengfen Wan, Yinan Zhang, Yachao Zhang, Yanlei Hu, Zengji Yue, Arun Kumar, Raimondo Cecchini, Massimo Longo
Summary: This research investigates and improves the photo-absorption and photothermal effect in Sb2Te3 topological insulator nanograting, achieving high absorption capacity and efficient photothermal conversion. It contributes to the advancement of the fundamental knowledge of light-matter interaction and photothermal effects in topological insulator materials, and benefits the development of efficient photothermal materials for high-performance nano-energy and biomedical technologies.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yansheng Yao, Tao Peng, Yubin Peng, Qiangsong Meng, Suwan Zhu, Yanlei Hu, Jiawen Li, Dong Wu
Summary: This study presents an origami-patterned Janus (O-P-Janus) membrane using laser-ablated copper foams, which exhibits a higher water collection rate compared to conventional planar fully ablated Janus membranes. The underlying mechanism of water collection enhancement is revealed, and potential applications are proposed.
