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Surface micro-nano structures on GaN Thin Films Induced by 355 nm nanosecond Laser Irradiation

激光与光电子学进展 2023年第7期60卷 196-202页

作者： Gu Yonggang Niu Jian Yang Jian Dong Fang Xu Hongxing School of Physics and Technology Wuhan UniversityWuhan 430072HubeiChina State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China The Institute of Technological Sciences Wuhan UniversityWuhan 430072HubeiChina

Gallium nitride(GaN)has widespread applications in the semiconductor industry because of its desirable optoelectronic properties.The fabrication of surface structures on GaN thin films can effectively modify their optical and electrical properties,providing additional degrees of freedom for controlling GaN-based devices.Compared with lithography-based techniques,laser processing is maskless and much more efficient.This paper shows how surface micronano structures can be produced on GaN thin films using 355 nm nanosecond laser irradiation.The effects of the laser pulse energy,number of pulses,and polarization direction were studied.It was found that distinct micro-nano structures were formed under different irradiation conditions,and their geometries and elemental compositions were analyzed.The results indicate that different types of surface micro-nano structures can be produced on GaN thin films in a controllable manner using 355 nm nanosecond laser irradiation.The results of our study provide valuable guidance for the surface modification of GaN-based optoelectronic devices.

关键词： gallium nitride thin films nanosecond laser micro-nano structures laser-induced periodic surface structures

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Bioinspired Functional Surfaces for Medical Devices

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 37-50页

作者： Liwen Zhang Guang Liu Yurun Guo Yan Wang Deyuan Zhang Huawei Chen School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China

Medical devices are a major component of precision medicine and play a key role in medical treatment,particularly with the rapid development of minimally invasive surgery and wearable devices.Their tissue contact properties strongly affect device performance and patient health(e.g.,heat coagulation and slipperiness on surgical graspers).However,the design and optimization of these device surfaces are still indistinct and have no supporting principles.Under such conditions,natural surfaces with various unique functions can provide solutions.This review summarizes the current progress in natural functional surfaces for medical devices,including ultra-slipperiness and strong wet attachment.The underlying mechanisms of these surfaces are attributed to their coupling effects and featured micronano structures.Depending on various medical requirements,adaptable designs and fabrication methods have been developed.Additionally,various medical device surfaces have been validated to achieve enhanced contact properties.Based on these studies,a more promising future for medical devices can be achieved for enhanced precision medicine and human health.

关键词： Bioinspired functional surfaces Medical devices Wet attachment Interfacial liquid micro-nano structures Wearable devices

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Biomimetic Photonic structures with Tunable Structural Colours： From Natural to Biomimetic to Applications

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Journal of Bionic Engineering 2018年第1期15卷 1-33页

作者： Zelinlan Wang Zhiguang Guo Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei University Wuhan 430062 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

Natural photonic structure with tunable structural colours is one of the most miraculous structures which always catches our eyes. However, the application of artificial photonic structures is limited. Moreover, because of the ability of tunable colours, photonic structure is the excellent candidate for many fields, such as sensor, bioassay, anti-counterfeiting, optical components, photocatalytic, fibers and fabrics. Considering the superior tunable optical property and other excellent performance such as robust mechanical strength, wettability, there are new domains and novel routes for this material that deserve us to explore. In this review, some natural photonic structures are discussed. Some novel fabrication methods and applications will be mentioned in this article. Furthermore, this review provides an insight and outlook for the photonic material with tunable eolours focusing on fabrication, design and applications.

关键词： biomimetic material structural colours photonic structure tunable structural colours micro-nano structures

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