Kaiqiang Cao

Shenyang University of Chemical Technology

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Tianqing Jia

East China Normal University

Zhenrong Sun

East China Normal University

Donghai Feng

East China Normal University

Shian Zhang

Zhejiang Provincial People's Hospital

Jukun Liu

Shanghai Institute of Technology

K. L. Cheng

Shanghai Jiao Tong University

Qilin Jiang

East China Normal University

Yuchan Zhang

East China Normal University

Long Chen

East China Normal University

Ruozhong Han

East China Normal University

Cooperative Institutions

East China Normal University

Chinese Academy of Sciences

Shenyang University of Chemical Technology

Zhejiang University

University of Chinese Academy of Sciences

Shanghai Institute of Technology

Shanxi University

Shanghai Jiao Tong University

Shanghai Dianji University

Shanghai Institute of Optics and Fine Mechanics

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Tunable simultaneous Bayesian optimization of hole taper and processing time in QCW laser drilling

Journal of Manufacturing Processes (2023)

Jian Yang Jian Niu Long Chen Kaiqiang Cao Tianqing Jia

Laser drilling

Bayesian Optimization

10.1016/j.jmapro.2023.12.054

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Citations (4)

Extremely regular periodic surface structures in a large area efficiently induced on silicon by temporally shaped femtosecond laser

Photonics Research (2021)

Yuchan Zhang Qilin Jiang Kaiqiang Cao Tianqi Chen K. L. Cheng

Femtosecond laser-induced periodic surface structures (LIPSS) have several applications in surface structuring and functionalization. Three major challenges exist in the fabrication of regular and uniform LIPSS: enhancing the periodic energy deposition, reducing the residual heat, and avoiding the deposited debris. Herein, we fabricate an extremely regular low-spatial-frequency LIPSS (LSFL) on a silicon surface by a temporally shaped femtosecond laser. Based on a 4 f configuration zero-dispersion pulse shaping system, a Fourier transform limit (FTL) pulse is shaped into a pulse train with varying intervals in the range of 0.25–16.2 ps using periodic π -phase step modulation. Under the irradiation of the shaped pulse with an interval of 16.2 ps, extremely regular LSFLs are efficiently fabricated on silicon. The scan velocity for fabricating regular LSFL is 2.3 times faster, while the LSFL depth is 2 times deeper, and the diffraction efficiency is 3 times higher than those of LSFL using the FTL pulse. The formation mechanisms of regular LSFL have been studied experimentally and theoretically. The results show that the temporally shaped pulse enhances the excitation of surface plasmon polaritons and the periodic energy deposition while reducing the residual thermal effects and avoiding the deposition of the ejected debris, eventually resulting in regular and deeper LSFL on the silicon surface.

Deposition

10.1364/prj.418937

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Citations (60)

Ultrafast dynamics of single-pulse femtosecond laser-induced periodic ripples on the surface of a gold film

Physical review. B./Physical review. B (2018)

K. L. Cheng Jukun Liu Kaiqiang Cao Long Chen Yuchan Zhang

The ultrafast dynamics of periodic ripples are studied during their formation on the surface of a gold film with a prefabricated nanogroove. These transient ripples are induced by a single 800-nm, 50-fs laser pulse and are observed by a collinear pump-probe imaging method. When the laser polarization is parallel to the nanogroove, transient ripples begin appearing after an elapsed time of 25--80 ps, and become clear and regular at 400--600 ps. The ripple period increases from 685 to 770 nm as the laser fluence $F$ increases from 0.73 to $3.42\phantom{\rule{0.16em}{0ex}}\mathrm{J}/\mathrm{c}{\mathrm{m}}^{2}$. The evolution of temperature and lattice temperature are theoretically studied using the two-temperature model. When the laser fluence $F$ is above $0.73\phantom{\rule{0.16em}{0ex}}\mathrm{J}/\mathrm{c}{\mathrm{m}}^{2}$, the electron temperature rises to several ${10}^{4}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and the collision frequency rises above ${10}^{16}/\mathrm{s}$, which further causes the localization of hot electrons. Moreover, the $d$-band electrons can be excited through two-photon absorption and become free electrons. Using the dielectric constant of the excited states, which includes the effects of hot-electron localization and $d$-band transitions, the period predicted by the surface-plasmon-polarization (SPP) model accords well with experimental results. Both theory and experiment give support to SPP excitations playing a prominent role in the formation of periodic ripples induced by femtosecond laser pulses.

10.1103/physrevb.98.184106

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Citations (46)

Supplementary document for Surface birefringence of regular periodic nanoripples produced on glass coated with indium tin oxide film using a low-fluence femtosecond laser through a cylindrical lens - 4804761.pdf

Long Chen Kaiqiang Cao Jukun Liu Tianqing Jia Zhang Shi

Indium tin oxide

10.6084/m9.figshare.12923867.v1

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Surface birefringence in FTO thin film fabricated by ultrafast laser

Journal of Nonlinear Optical Physics & Materials (2022)

Long Chen Jian Yang Fengzhuo Zhang Yuchan Zhang Qilin Jiang

Ultrafast laser-induced periodic surface structures (LIPSSs) have been studied intensely in the last two decades, which have become a useful method for surface nanostructures and are widely used to tune surface properties. This paper reported the fabrication of high-spatial-frequency LIPSSs (HSFLs) on FTO film induced by 1,030[Formula: see text]nm femtosecond laser. The morphology, duty cycle and birefringence effects of HSFLs were studied in detail by changing the laser fluence and scanning speed. Clear and uniform HSFLs were formed over the entire ablated area when the laser fluence and scanning speed were 89[Formula: see text]mJ/cm 2 and 0.01[Formula: see text]mm/s, respectively. The duty cycle of the HSFL was measured to be as high as 0.36, and the thickness of the HSFL layer was found to be in the range of 409–546[Formula: see text]nm. The phase retardation of the FTO film with HSFLs could reach up to 96[Formula: see text]nm and could be used as an optical attenuator with a tunable range of 71–100% for 532[Formula: see text]nm linear polarized light.

Duty cycle

10.1142/s0218863522500308

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Citations (1)

Surface birefringence of regular periodic surface structures produced on glass coated with an indium tin oxide film using a low-fluence femtosecond laser through a cylindrical lens

Optics Express (2020)

Long Chen Kaiqiang Cao Jukun Liu Tianqing Jia Yanli Li

Large-area regular laser-induced periodic surface structures (LIPSSs) with a birefringence effect were efficiently produced on a glass surface coated with an indium tin oxide (ITO) film, through irradiation by a femtosecond laser (800 nm, 50 fs, 3 mJ, 1 kHz) focused with a cylindrical lens. The laser fluence of 0.44 J/cm2 on the coated glass was only one-tenth of that on bare glass, which significantly reduced the thermal effect. Moreover, regular LIPSSs with a period as short as 100 nm could be produced efficiently. The retardance of the fabricated LIPSSs was measured to be up to 44 nm, which is eight times that of LIPSSs fabricated on bare glass. The mechanisms of such a large difference of retardance were studied by measuring the nanostructures and the concentration of In3+ ions on the cross section of nano-corrugated surface layer on bare glass and ITO-coated glass.

Indium tin oxide

10.1364/oe.402037

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Design for Low Latency and High Reliability: OPC-UA Based Production Line for Product Traceability and Customized Service

Kaiqiang Cao Li Zhang Chengwei Zhou

With the growing popularity of edge computing and Industry 4.0, the Industrial Internet-of-Things (IIoT) has emerged as a promising alternative to improve the production efficiency of the manufacturing system. Among various intelligent manufacturing features, product traceability and customized service are highly desired, which not only enables the tracking of the end to end inventory to ensure high reliability, but also provides personalized characteristics to meet different customer demands. However, in tradition, such traceability or customized service are achieved at the cost additional time-consuming steps and hence incur more manufacturing cost. To address the aforementioned issues, we propose a low latency OPC-UA based IIoT system and apply that to the production line for product traceability and customized service. The designed OPC-UA is deployed at the edge gateway to effectively solve the data heterogeneity, support centralized control of network resources, and ensure low latency and high reliability of data transmission. In addition, the inter-communication mechanism among multiple devices on the same production line is improved to enable both flexibility and robustness. Experimental results on a demo production line show that the proposed architecture can help achieve both low latency and high reliability.

Traceability

Production line

10.1109/icites53477.2021.9637063

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Citations (1)

Femtosecond laser-induced periodic structures: mechanisms, techniques, and applications

Opto-Electronic Science (2022)

Yuchan Zhang Qilin Jiang Mingquan Long Ruozhong Han Kaiqiang Cao

Over the past two decades, femtosecond laser-induced periodic structures (femtosecond-LIPSs) have become ubiquitous in a variety of materials, including metals, semiconductors, dielectrics, and polymers. Femtosecond-LIPSs have become a useful laser processing method, with broad prospects in adjusting material properties such as structural color, data storage, light absorption, and luminescence. This review discusses the formation mechanism of LIPSs, specifically the LIPS formation processes based on the pump-probe imaging method. The pulse shaping of a femtosecond laser in terms of the time/frequency, polarization, and spatial distribution is an efficient method for fabricating high-quality LIPSs. Various LIPS applications are also briefly introduced. The last part of this paper discusses the LIPS formation mechanism, as well as the high-efficiency and high-quality processing of LIPSs using shaped ultrafast lasers and their applications.

10.29026/oes.2022.220005

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Citations (54)

Periodic subwavelength ripples on a Si surface induced by a single temporally shaped femtosecond laser pulse: enhanced periodic energy deposition and reduced residual thermal effect

Journal of Physics D Applied Physics (2021)

Yuchan Zhang K. L. Cheng Kaiqiang Cao Qilin Jiang Tianqi Chen

Deposition

Pulsed Laser Deposition

10.1088/1361-6463/ac0f20

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Citations (3)

Large area patterning of ultra-high thermal-stable structural colors in transparent solids

Chinese Optics Letters (2022)

Jie Zhang Dezhi Tan Kaiqiang Cao Tianqing Jia Jianrong Qiu

Printing stable color with a lithography-free and environment-friendly technique is in high demand for applications. We report a facile strategy of ultrafast laser direct writing (ULDW) to produce large-scale embedded structural colors inside transparent solids. The diffraction effect of gratings enables effective generation of structural colors across the entire visible spectrum. The structural colors inside the fused silica glass have been demonstrated to exhibit excellent thermal stability under high temperature up to 1200°C, which promises that the written information can be stable for long time even with unlimited lifetime at room temperature. The structural colors in the applications of coloring, anti-counterfeiting, and information storage are also demonstrated. Our studies indicate that the presented ULDW allows for fabricating large-scale and high thermal-stability structural colors with prospects of three-dimensional patterning, which will find various applications, especially under harsh conditions such as high temperature.

Structural Coloration

Thermal Stability

Nanoimprint lithography

10.3788/col202220.030501

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Citations (4)