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Micromachines
Special Issues
Advanced Optical Manufacturing Technologies and Applications
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Advanced Optical Manufacturing Technologies and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (15 October 2024) | Viewed by 3563

Special Issue Editors

Prof. Dr. Jiang Guo

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Guest Editor
School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
Interests: intelligent precision machining; surface integrity; precision measurement
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Yebing Tian

E-Mail Website
Guest Editor
Institute of Advanced Manufacturing, Shandong University of Technology, Zibo 255049, China
Interests: alloy
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Zhenzhong Wang

E-Mail Website
Guest Editor
School of Aeronautics and Astronautics, Xiamen University, Xiamen 361005, China
Interests: precision engineering; ultra-precision machining technology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jianguo Zhang

E-Mail Website
Guest Editor
School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: ultra-precision machining of difficult-to-machine materials; elliptical vibration diamond cutting and ultra-precision micro-manufacturing of functional micro–nano structures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will publish selected papers from the 2nd International Conference on Advanced Optical Manufacturing Technologies and Applications, and the 4th International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2024) (https://b2b.csoe.org.cn/meeting/YSAOM2024.html) on micromachines in Xi’an, China, 5–7th July 2024.

We aim to collect high-quality research papers and review articles from AOMTA and YSAOM 2024, which focus on advanced optical manufacturing technology, optical intelligent manufacturing, ultra-precision manufacturing, precision measurement, intelligent sensing and control, and material science. This conference will cover the following main topics:

  1. Large optical mirror and telescope technology;
  2. Micro-nanostructure optics and manufacturing technologies;
  3. Ultra-precision machining technology for optical complex surfaces and functional structures;
  4. Ultra-precision optical measurement technology and equipment;
  5. High-performance manufacturing technology for short-wavelength optical components;
  6. High-efficiency optical precision processing technologies and new methods;
  7. High-performance optical microstructure manufacturing processes and equipment;
  8. Advanced optical coating technology and equipment;
  9. Optical design, assembly, and system modeling technology;
  10. Manufacturing and applications of optofluidic chip and liquid crystal optics.

Papers attracting the most interest at the conference, or that provide novel contributions, will be selected for publication in Micromachines. These papers will be peer-reviewed for the validation of research results, developments, and applications.

Prof. Dr. Jiang Guo
Prof. Dr. Yebing Tian
Prof. Dr. Zhenzhong Wang
Prof. Dr. Jianguo Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • optical precision processing technologies
  • ultra-precision machining technology
  • micro-nanostructure optics and manufacturing technologies

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (4 papers)

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Research

12 pages, 10212 KiB  
Article
Fine Control of Optical Properties of Nb2O5 Film by Thermal Treatment
by Xianpeng Liang, Bowen Liu, Quan Yuan, Xiaomin Lin, Shaopeng Ren, Shuaifeng Zhao, Xiaojun Yin and Shuguo Fei
Micromachines 2024, 15(12), 1453; https://doi.org/10.3390/mi15121453 - 29 Nov 2024
Viewed by 579
Abstract
Thermal treatment is a common method to improve the properties of optical thin films, but improper thermal treatment processing will result in the degradation of the optical properties of the optical thin film. The thermal stability of niobium oxide (Nb2O5 [...] Read more.
Thermal treatment is a common method to improve the properties of optical thin films, but improper thermal treatment processing will result in the degradation of the optical properties of the optical thin film. The thermal stability of niobium oxide (Nb2O5) thin films prepared by magnetron sputtering was systematically studied by analyzing the roughness and morphology of the film under different thermal treatment processes. The results show that the amorphous stability of the Nb2O5 thin film can be maintained up to 400 °C. Before crystallization, with an increase in annealing temperature, the surface roughness of the film has no obvious change, the refractive index decreases, and the elastic modulus and hardness increase. The residual stress was measured by a laser interferometer. The results show that the residual compressive stress is present in the film, and the residual stress decreases with an increase in thermal treatment temperature. Considering the residual stress state, phase composition, mechanical properties, and optical properties of Nb2O5 films at different thermal treatment temperatures, we believe that the spectral position of the optical thin film device can be finely controlled within a 1.6% wavelength, and the thermal treatment temperature of Nb2O5 films prepared by magnetron sputtering should not exceed 400 °C. Full article
(This article belongs to the Special Issue Advanced Optical Manufacturing Technologies and Applications)
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10 pages, 4425 KiB  
Article
Laser Fabrication and Performance of Flexible Pressure Sensors with Ridge-Mimicking Spatially Ordered Microstructures
by Linjing Wu, Chao Gao, Jincheng Wang, Chen Zhang and Yuzhi Ke
Micromachines 2024, 15(12), 1441; https://doi.org/10.3390/mi15121441 - 28 Nov 2024
Viewed by 614
Abstract
The proliferation of flexible pressure sensors has generated new demands for high-sensitivity and low-cost sensors. Here, we propose an elegant strategy to address this challenge by taking a ridge-mimicking, gradient-varying, spatially ordered microstructure as the sensing layer, with laser processing and interdigitated electrodes [...] Read more.
The proliferation of flexible pressure sensors has generated new demands for high-sensitivity and low-cost sensors. Here, we propose an elegant strategy to address this challenge by taking a ridge-mimicking, gradient-varying, spatially ordered microstructure as the sensing layer, with laser processing and interdigitated electrodes as the upper and lower electrode layers. Simultaneously, the entire structure is encapsulated with polyimide (PI) tape for protection, and the fabrication process is relatively feasible, facilitating easy scaling. The presented results show that the flexible pressure sensor exhibits a sensitivity of 1.65 kPa−1 across a pressure range of 0 to 1100 kPa. Furthermore, the sensor displays low hysteresis, as well as rapid response and recovery times of 62 ms and 83 ms, respectively. Finally, we demonstrate the application potential of the sensor for monitoring joint movements, especially for detecting pressure and direction in finger joints. This technology shows great potential for applications in smart robotics, wearable devices, health monitoring, and other emerging technologies. Full article
(This article belongs to the Special Issue Advanced Optical Manufacturing Technologies and Applications)
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25 pages, 13748 KiB  
Article
Research on Stability of Removal Function in Figuring Process of Mandrel of X-Ray-Focusing Mirror with Variable Curvature
by Jiadai Xue, Yuhao Li, Mingyang Gao, Dongyun Gu, Yanlin Wu, Yanwen Liu, Yuxin Fan, Peng Zheng, Wentao Chen, Zhigao Chen, Zheng Qiao, Yuan Jin, Fei Ding, Yangong Wu and Bo Wang
Micromachines 2024, 15(12), 1415; https://doi.org/10.3390/mi15121415 - 25 Nov 2024
Viewed by 636
Abstract
Over the past 30 years, researchers have developed X-ray-focusing telescopes by employing the principle of total reflection in thin metal films. The Wolter-I focusing mirror with variable-curvature surfaces demands high precision. However, there has been limited investigation into the removal mechanisms for variable-curvature [...] Read more.
Over the past 30 years, researchers have developed X-ray-focusing telescopes by employing the principle of total reflection in thin metal films. The Wolter-I focusing mirror with variable-curvature surfaces demands high precision. However, there has been limited investigation into the removal mechanisms for variable-curvature X-ray mandrels, which are crucial for achieving the desired surface roughness and form accuracy, especially in reducing mid-spatial frequency (MSF) errors. It is essential to incorporate flexible control in deterministic small-tool polishing to improve the tool’s adaptability to curvature variations and achieve stable, Gaussian-like tool influence functions (TIFs). In this paper, we introduce a curvature-adaptive prediction model for compliance figuring, based on the Preston hypothesis, using a compliant shaping tool with high slurry absorption and retention capabilities. This model predicts the compliance figuring process of variable-curvature symmetrical mandrels for X-ray grazing incidence mirrors by utilizing planar tool influence functions. Initially, a variable-curvature pressure model was developed to account for the parabolic and hyperbolic optical surfaces’ curvature characteristics. By introducing time-varying removal functions for material removal, the model establishes a variable-curvature factor function, which correlates actual downward pressure with parameters such as contact radius and contact angle, thus linking the variable-curvature surface with a planar reference. Subsequently, through analysis of the residence time distribution across different TIF models, hierarchical filtering, and PSD distribution, real-time correction of the TIFs was achieved to enable customized variable-curvature polishing. Furthermore, by applying a time-varying deconvolution algorithm, multiple rounds of flexible polishing iterations were conducted on the mandrels of a rotationally symmetric variable-curvature optical component, and the experimental results demonstrate a significant improvement in form accuracy, surface quality, and the optical performance of the mirror. Full article
(This article belongs to the Special Issue Advanced Optical Manufacturing Technologies and Applications)
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13 pages, 2724 KiB  
Article
Reverse Design of Pixel-Type Micro-Polarizer Arrays to Improve Polarization Image Contrast
by Yonggui Shi, Zhihai Lin, Tianran Wang, Chaokai Huang, Hui Chen, Jianxiong Chen and Yu Xie
Micromachines 2024, 15(10), 1251; https://doi.org/10.3390/mi15101251 - 12 Oct 2024
Viewed by 964
Abstract
Micro-polarizer array (MPA) is the core optical component of the Division of Focal-Plane (DoFP) imaging system, and its design is very important to the system’s performance. Traditional design methods rely on theoretical analysis and simulation, which is complicated and requires designers to have [...] Read more.
Micro-polarizer array (MPA) is the core optical component of the Division of Focal-Plane (DoFP) imaging system, and its design is very important to the system’s performance. Traditional design methods rely on theoretical analysis and simulation, which is complicated and requires designers to have profound theoretical foundations. In order to simplify the design process and improve efficiency, this paper proposes a 2 × 2 MPA reverse-design strategy based on particle swarm optimization (PSO). This strategy uses intelligent algorithms to automatically explore the design space in order to discover MPA structures with optimal optical properties. In addition, the all-pass filter is introduced to the MPA superpixel unit in the design, which effectively reduces the crosstalk and frequency aliasing between pixels. In this study, two MPA models were designed: a traditional MPA and an MPA with an all-pass filter. The Degree of Linear Polarization (DOLP) image contrast is used as the evaluation standard and compared with the traditional MPA; the results show that the contrast of the newly designed traditional MPA image is increased by 21%, and the MPA image with the all-pass filter is significantly increased by 82%. Therefore, the reverse-design method proposed in this paper not only simplifies the design process but also can design an MPA with enhanced optical performance, which has obvious advantages over the traditional method. Full article
(This article belongs to the Special Issue Advanced Optical Manufacturing Technologies and Applications)
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