Article
Materials Science, Multidisciplinary
Yanyu Duan, Yun Ye, Enguo Chen, Sheng Xu, Tailiang Guo
Summary: This study systematically explores the effect of inkjet-printed quantum dots (QDs) microstructure morphology on light guide plate (LGP) performance. The ideal radius length and height ratio of the microstructure was obtained as 25 using ray-tracing simulation optimization. The morphology of individual QDs microstructure was optimized using the limiting effect of UV glue. The findings provide valuable insights for large-scale application of QDs microstructure LGP.
Article
Optics
Yayan Huang, Rui Zhao, Wenhao Miao, Dan Liang, Zhiqiang Liu, Xian Wei, Zhongcheng Liang
Summary: This paper proposes a tunable zoom bifocal liquid lens based on selective wettability. The lens consists of immiscible internal and external droplets that can change their curvatures by applying different voltages, resulting in continuous movement of the long and short focal points. Experimental results demonstrate the feasibility and practicability of this concept.
Article
Computer Science, Software Engineering
Koya Narumi, Kazuki Koyama, Kai Suto, Yuta Noma, Hiroki Sato, Tomohiro Tachi, Masaaki Sugimoto, Takeo Igarashi, Yoshihiro Kawahara
Summary: We propose Inkjet 4D Print, a method that uses an inkjet UV printer to print 2D patterns on a heat-shrinkable base sheet to create self-folding 3D origami tessellations. Compared to previous folding-based 4D printing approaches using FDM 3D printers, our method offers higher resolution, faster printing speed, and optional full-color decoration.
ACM TRANSACTIONS ON GRAPHICS
(2023)
Article
Engineering, Electrical & Electronic
Pin-Chuan Chen, Cing-Sung Yeh, Chih-Yu Hsieh
Summary: This study applied defocusing to digital light processing (DLP) stereolithography to fabricate microlens arrays (MLAs) within 1 s. The effects of exposure energy, defocus distance, and a diameter adjustment algorithm were investigated to achieve MLAs with desired dimensions. The results showed that the proposed fabrication method is suitable for various MLA designs, with nanoscale surface roughness and good image quality.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Optics
Bo-Yen Lin, Yi-Ru Li, Chia-Hsuan Chen, Hao-Chun Hsu, Mao-Kuo Wei, Jiun-Haw Lee, Tien-Lung Chiu
Summary: This study investigates the effects of electron transport layer (ETL) thickness on light extraction in corrugated organic light-emitting diodes (OLEDs). The results show that light extraction in corrugated OLEDs significantly depends on the ETL thickness. Changing the ETL thickness alters the distribution of carrier recombination and results in different attribution of optical loss modes in OLEDs, leading to variations in light extraction and device efficiency.
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
Chemistry, Analytical
Zhiyang Lv, Yunhan Huang, Zhiying Liu
Summary: The micro lens array (MLA) system enables fast beam deflection through lateral displacement between arrays, while also offering advantages of miniaturization and good functionality. However, crosstalk beams generated between microlens array units during system operation introduce additional stray light and affect imaging contrast. This study uses matrix operation method to analyze the generation mechanism of crosstalk stray light in the MLA system and proposes a crosstalk suppression method based on a stop array to reduce stray light. The proposed method is validated through an example of an infrared array scanning infrared optical system, providing a theoretical basis for the design and analysis of microlens array scanning and search system.
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
Chemistry, Multidisciplinary
Shulun Li, Xiangjun Shang, Yao Chen, Xiangbin Su, Huiming Hao, Hanqing Liu, Yu Zhang, Haiqiao Ni, Zhichuan Niu
Summary: This study demonstrates the fabrication of uniform arrays of GaAs microlenses that show enhanced quantum light extraction for epitaxial single quantum dots. The microlenses can improve quantum efficiency and could potentially be applied in telecom-band epitaxial quantum dots.
Article
Materials Science, Multidisciplinary
Naoyuki Harada, Masanori Uji, Baljeet Singh, Nobuo Kimizuka, Nobuhiro Yanai
Summary: Researchers have achieved photon upconversion from visible light to ultraviolet light with a record-high efficiency of 27.6% by soaking a porous film in a low-volatile upconversion solution. Moreover, by combining this film with a microlens array, a significantly low threshold excitation light intensity of less than 0.60 mW cm-2, at least one order of magnitude lower than solar irradiance, is achieved.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nuclear Science & Technology
Suyeon Hyeon, Mark Hammig, Manhee Jeong
Summary: This article presents two methods to overcome the information loss associated with the loss of photons created by scintillation pixels coupled to an associated silicon photomultiplier pixel, and improves the energy and spatial resolution of radiation imagers. However, there is only slight improvement in image sensitivity and quality.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Instruments & Instrumentation
Maximilian Schambach, Qiaoshuang Zhang, Uli Lemmer, Michael Heizmann
Summary: In recent years, inkjet-printed microoptics, such as microlens arrays, have gained popularity in scientific research and industrial applications due to their fast prototyping and production process. However, optimizing process parameters requires expert knowledge and manual quality control, which can be subjective and error-prone. To address these issues, an automated evaluation pipeline utilizing both light and confocal microscope images and multiple quality measures has been proposed.
TM-TECHNISCHES MESSEN
(2021)
Article
Optics
Souptik Mukherjee, Zheng-Nan Yuan, Zhi-Bo Sun, An-Ran Li, Chen-Bing Kang, Hoi-Sing Kwok, Abhishek K. Srivastava
Summary: The article introduces a switchable lens device combining a fast FLC-based polarization rotation unit and a passive LC lens, allowing rapid access to multiple focal points, making it a convenient device for VR applications.
Article
Materials Science, Multidisciplinary
Vinay Kumar, Fabrizio Gota, Julien Neyret, Ngei Katumo, Aditya Chauhan, Stephan Dottermusch, Bryce S. Richards, Ian A. Howard
Summary: A phosphor-particle-loaded microlens array on a polymer substrate provides an unclonable anticounterfeiting label design. The random coincidences of light focused by a microlens with a phosphor microparticle create a random pattern of bright emission points. The authentication of these labels using a single smartphone is possible through the smartphone flashlight and camera, with >99% confidence in matching test and reference images and a 1 cm tolerance for smartphone positioning accuracy.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Hongbae Park, Boris Stoeber
Summary: We present a visor-based see-through head-worn light field display that utilizes a semi-reflective concave image combiner to overlay virtual imagery onto the user's visual field. The visor incorporates a toroidal surface profile for correcting off-axis astigmatism. Virtual images are generated at different depths using a conventional light field assembly (LFA) comprising a microlens array and a display source. The LFA is positioned above the visor at an angle and is located near the focal plane of the visor. This design allows for a more compact display system compared to traditional head-worn displays.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2023)
