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
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
Engineering, Manufacturing
Tianfeng Zhou, Jia Zhou, Tianxing Wang, Liheng Gao, Benshuai Ruan, Qian Yu, Wenxiang Zhao, Xibin Wang
Summary: Ultraprecision mold machining combined with precision glass molding is the most promising technology for mass production of glass microlens arrays. This study proposes a local spiral diamond milling method to fabricate high aspect-ratio MLAs and develops a toolpath generation algorithm. Each lenslet can be precisely machined by controlling the servo motions of the three translational axes, and the entire MLA can be generated by shifting the toolpath according to the MLA layout. The experimental results show that the fabricated mold and molded lenses have high profile accuracy and surface roughness, and exhibit good consistency.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Ceramics
Rao Li, Chengkang Li, Mengfei Yan, Min Li, Changgui Lin, Shixun Dai, Baoan Song, Tiefeng Xu, Peiqing Zhang
Summary: This study fabricated convex microlens arrays on chalcogenide glass surface using femtosecond laser direct writing and precision molding. Regularly arranged damage craters were induced on silica glass surface by femtosecond laser writing. The surface of silica was then etched with hydrofluoric acid to obtain a smooth concave microlens, which was replicated on the surface of chalcogenide glass by precision molding. The resulting chalcogenide glass microlens array showed uniform structure, clear image, and good focusing effect. The method provides an efficient way to prepare large-scale microlens array masks and microlens.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Rishikesh Kushawaha, Aloka Sinha
Summary: Polymer dispersed liquid crystals (PDLCs) are used to fabricate free-standing optical diffusers based on liquid crystals (LCs) and cellulose acetate polymer network. By optimizing the concentration of LC and polymer, the fabricated PDLC films exhibit high scattering value and wide angle light transmission distribution. This technique provides a simple and inexpensive fabrication process for light-diffusing films in high-performance foldable optoelectronic devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Jingyu Wu, David A. Issadore, Daeyeon Lee
Summary: Controlling surface wetting properties of microfluidic channels is essential for reliable performance. Current patterning methods have limited spatial resolution, making them impractical. In this study, a replica mold fabrication technique inspired by soft lithography was developed to transfer channel geometry and surface wettability from a silicon wafer mold to a co-polymer network replica. This technique was successfully demonstrated in the fabrication of a PFPE-PEG-based microfluidic chip with patterned microchannels for double emulsion generation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Multidisciplinary
Shigeru Tanikawa, Jiwang Yan
Summary: A novel method for fabricating micro dimple arrays with controllable randomness in dimple size and depth using fast tool servo (FTS)-based single-point diamond turning was proposed in this study. Segmented cutting method improved edge accuracy and was effective for machining RSS, achieving precise matching between the machined surface and the designed surface. This machining method enables high-precision patterning of mold inserts for molding/imprinting RSS on polymer materials.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Chunxin Liu, Taras Oriekhov, Cherrie Lee, Clarissa M. Harvey, Michael Fokine
Summary: This study demonstrates that rapid manufacturing of high purity fused silica glass micro-optics can be achieved using a filament-based glass 3D printer, resulting in fully dense lenses with uniform focal lengths and good imaging performance.
3D PRINTING AND ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Ceramics
Tianfeng Zhou, Zihao Zeng, Qian Yu, Jia Zhou, Peng Liu, Xibin Wang
Summary: This paper proposes a multi-step molding method to avoid gas trapping in microlens arrays during precision glass molding (PGM) and improve their accuracy. The defect formation mechanism caused by trapped gas is investigated, and the effect of molding pressure is analyzed. A numerical model of the mold-nitrogen-glass interface is established to predict the minimum number of PGM steps required to reduce gas-induced defects. Experimental results validate the numerical model, showing a significant reduction in defect height with a three-step PGM process. The molded microlens array has a peak-to-valley value of 0.38 μm and a surface roughness Ra of 3.5 nm, making it suitable for high-precision glass microlens array fabrication.
INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Xiao-Feng Liu, Rui Wang, Guo-Dong Wang, Teng-Feng Yao, Hua Miao, Rong Sun
Summary: A novel fabrication method combining thermal reflow process was developed to prepare highly desired optical polymer waveguides. The influence of processing parameters on the profiles of the resultant polymer waveguides was systematically investigated and the mode-of-action of thermal reflow process was proposed. The as-fabricated waveguides exhibited better optical performance than those of polymer waveguides fabricated via photolithography.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Analytical
Fan Zhang, Qing Yang, Hao Bian, Xun Hou, Feng Chen
Summary: A rapid and single-step method for fabricating a zinc selenide concave microlens array using high-speed line-scanning of a femtosecond laser pulse was presented. Approximately 1.1 million microlenses were fabricated within 36 minutes, with controlled size and high transparency at infrared wavelengths. The method shows great potential for developing ZnSe-based micro-optical devices.
Article
Chemistry, Physical
Anindita Das, Udit Pant, Cuong Cao, Rakesh S. Moirangthem, Hitesh Bhanudas Kamble
Summary: The proposed work aims to develop a sensitive surface-enhanced Raman spectroscopy (SERS) nano-biosensor using gold-coated polymer nanopyramid arrays as the SERS substrate. The study also investigates the Raman signal enhancement mechanism through electromagnetic simulation and evaluates the potential of the fabricated nanopyramid arrays for low-cost, large scale detection of hazardous compounds at ultra-low concentrations.
Article
Optics
Yan Liang, Tianfei Zhu, Mengjia Xi, Haris Naeem Abbasi, Jiao Fu, Rui Su, Zhiqiang Song, Hongxing Wang, Kaiyue Wang
Summary: An ultra-smooth diamond concave microlens array was fabricated using a chemical reflow process assisted by dry etching technique, showing high-quality imaging and focusing performance, and achieving laser beam homogenization.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Abolfazl Zolfaghari, Lin Zhang, Wenchen Zhou, Allen Y. Yi
Summary: The research introduces a process using electroforming of nickel to replicate mold inserts directly from a plastic microlens array, enabling high-volume production. This method offers a promising technique for manufacturing microlens arrays with complex optical components.
MICROELECTRONIC ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Chengsong Shu, Xipeng Guo, Shaohui Yin, Shuai Huang, Zhaozhao Mao
Summary: This article introduces a fabrication method for high-quality CEMLA glass optical elements, which addresses molding challenges on hard and brittle glass materials. By using single-point diamond turning on the Ni-P mold, a high-precision CEMLA mold is machined, and a high-precision optical element is obtained through precision glass molding.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2023)
