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学者姓名：马赫
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Abstract ：
Achieving dynamic switching among absorption (A), reflection (R), and transmission (T) states is not only essential for advancing the understanding of light-metasurface interactions but also holds significant potential for practical applications, such as selective electromagnetic shielding and smart windows. However, at terahertz and higher frequencies, implementing active elements in multilayer configurations presents challenges that are not as straightforward as those encountered in the microwave range. In this work, it is demonstrated that tristate ART tuning can be realized in a single-layer, free-standing metasurface by switching between a dual dipolar mode (electric dipole and magnetic dipole) and a single dipole mode (electric dipole). By transferring a flexible vanadium dioxide (VO2) thin film onto the free-standing dielectric Huygens' metasurface, ART modulation is achieved, transitioning from a near-unity transmission state to a near-perfect absorption state, and finally to a high-reflection state with the reflection up to 0.65 during the insulator-to-metal transition induced by heating onto the phase-change material. The results may lead to new approaches in designing reconfigurable metasurfaces based on phase-change materials for wavefront control and electromagnetic shielding applications.
Keyword ：
huygens' metasurface huygens' metasurface tunable tunable vanadium dioxide vanadium dioxide phase-change material phase-change material dielectric metasurface dielectric metasurface
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| GB/T 7714 | Zhu, Fengjie , Yang, Kainan , Hao, Jianhua et al. Tristate Switching of Terahertz Metasurfaces Enabled by Transferable VO2 [J]. | LASER & PHOTONICS REVIEWS , 2025 , 19 (8) . |
| MLA | Zhu, Fengjie et al. "Tristate Switching of Terahertz Metasurfaces Enabled by Transferable VO2" . | LASER & PHOTONICS REVIEWS 19 . 8 (2025) . |
| APA | Zhu, Fengjie , Yang, Kainan , Hao, Jianhua , Fan, Kebin , Ma, He , Wu, Jingbo et al. Tristate Switching of Terahertz Metasurfaces Enabled by Transferable VO2 . | LASER & PHOTONICS REVIEWS , 2025 , 19 (8) . |
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Abstract ：
Modern optoelectronic devices trend toward greater flexibility, wearability, and multifunctionality, demanding higher standards for fabrication and operation temperatures. Vanadium dioxide (VO2), with its metal-insulator transition (MIT) at 68 degrees C, serves as a crucial functional layer in many optoelectronic devices. However, VO2 usually needs to grow at >450 degrees C in an oxygen-containing atmosphere and to function across its MIT temperature, leading to low compatibility with most optoelectronic devices, especially on flexible substrates. In this work, we report a layer-by-layer transfer method of wafer-scale tungsten-doped VO2 films, which enables sequential integration of the VO2 films with low MIT temperatures (down to 40 degrees C) onto arbitrary substrates. Notably, by stacking multiple VO2 films with different doped levels, a quasi-gradient-doped VO2 architecture can be achieved, effectively broadening the MIT temperature window and reducing the hysteresis of VO2. These integrated VO2 films find a wide scope of applications in flexible temperature indicator strips, infrared camouflage devices, nonreciprocal ultrafast light modulators, and smart photoactuators. Our work promotes the development of more flexible and tunable optoelectronic devices integrated with VO2.
Keyword ：
wafer-scale transfer wafer-scale transfer vertical integration vertical integration tungsten doping tungsten doping vanadium dioxide vanadium dioxide phase transition phase transition
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| GB/T 7714 | Li, Yuan , Ma, He , Shi, Run et al. Wafer-Scale Transfer and Integration of Tungsten-Doped Vanadium Dioxide Films [J]. | ACS NANO , 2025 , 19 (6) : 6209-6220 . |
| MLA | Li, Yuan et al. "Wafer-Scale Transfer and Integration of Tungsten-Doped Vanadium Dioxide Films" . | ACS NANO 19 . 6 (2025) : 6209-6220 . |
| APA | Li, Yuan , Ma, He , Shi, Run , Wu, Yonghuang , Feng, Shifeng , Fu, Yulan et al. Wafer-Scale Transfer and Integration of Tungsten-Doped Vanadium Dioxide Films . | ACS NANO , 2025 , 19 (6) , 6209-6220 . |
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Abstract ：
Structural colors generated by optical micro-/nanostructures offer a notable advantage over traditional chemical pigments, including higher purity, greater brightness, resistance to fading, and enhanced environmental friendliness. However, achieving dynamically switchable color displays with high performances and without resorting to complex nanofabrication methods remain a challenge. Here, we present a simple method using grayscale lithography and conformal coating to create Salisbury screen (SS) cavities with variable resonant wavelengths, enabling the formation of tunable colorful patterns. The dynamic color display is achieved through the phase change of vanadium dioxide (VO2) nanostructures under electrothermal effects. At a low actuation voltage of 1.4 V, high performances of color switching such as high sensitivity, fast speed, high repeatability, and wide-view angle are achieved. The tunable structural colors, featuring a simple preparation process and high-speed switching, represent a promising alternative for applications such as thermal sensors, security information encryption, and dynamic full-color displays.
Keyword ：
vanadium dioxide vanadium dioxide structural colors structural colors phase change materials phase change materials electrical control electrical control grayscale exposure grayscale exposure
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| GB/T 7714 | Zhang, Xiaochen , Sun, Haozhe , Li, Yuan et al. Tunable structural colors based on grayscale lithography and conformal coating of VO2 [J]. | NANOPHOTONICS , 2025 . |
| MLA | Zhang, Xiaochen et al. "Tunable structural colors based on grayscale lithography and conformal coating of VO2" . | NANOPHOTONICS (2025) . |
| APA | Zhang, Xiaochen , Sun, Haozhe , Li, Yuan , Hao, Jianhua , Liang, Qinghua , Zhang, Yongyue et al. Tunable structural colors based on grayscale lithography and conformal coating of VO2 . | NANOPHOTONICS , 2025 . |
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Abstract ：
Bionic microrobots working in liquid environments have attracted attention in recent years, because they play an important role in the medical fields. So far, most bionic microrobots serving in liquid environments (swimming microrobots) are fabricated based on organic materials. Limited by the inherent property of organic materials, the performance and lifetime of the swimming microrobots are still deficient. Facing this challenge, inspired by sperms, swimming microrobots based on the inorganic phase transition driving material vanadium dioxide are developed. In liquid environments, the linear and rotary motion of these sperm-like micro-robots could be controlled by changing the laser modulation frequency. The highest linear speed attained is 56 mu m s-1, and the highest rotary speed attained is 14 degrees s-1. The microrobot is able to undergo more than 105 cycles in a liquid environment without degradation of its performance. Considering its high performance and controllability, the swimming microrobot is expected to be helpful in medical applications such as precision drug delivery and minimally invasive surgery. Inspired by the sperm, photo-driven microrobots serving in liquid environments are developed. The linear and rotary motion of sperm-like micro-robots could be controlled by laser frequency. The highest linear and rotary speeds attain 56 mu m s and 14 degrees s-1. The microrobot undergoes more than 105 cycles in liquid environments without performance degradation.image (c) 2024 WILEY-VCH GmbH
Keyword ：
phase transitions phase transitions microrobots microrobots photodriven photodriven vanadium dioxides vanadium dioxides
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| GB/T 7714 | Zhang, Meng , Ma, He , Li, Yuan et al. Photo-Driven Sperm-Inspired Microrobots Serving in Liquid Environments [J]. | ADVANCED INTELLIGENT SYSTEMS , 2024 , 6 (11) . |
| MLA | Zhang, Meng et al. "Photo-Driven Sperm-Inspired Microrobots Serving in Liquid Environments" . | ADVANCED INTELLIGENT SYSTEMS 6 . 11 (2024) . |
| APA | Zhang, Meng , Ma, He , Li, Yuan , Wu, Jianhui , Hou, Jiwei , Liu, Kai et al. Photo-Driven Sperm-Inspired Microrobots Serving in Liquid Environments . | ADVANCED INTELLIGENT SYSTEMS , 2024 , 6 (11) . |
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Abstract ：
Although perovskite has great potential in optoelectronic devices, the simultaneous satisfaction of material stability and high performance is still an issue that needs to be solved. Most perovskite optoelectronic devices use quantum dot spin coating or the gas-phase growth of perovskite thin films as the photoelectric conversion layer. Due to stability limitations, these materials often experience a significant decrease in photoelectric conversion efficiency when encountering liquid reagents. The self-assembled growth of hybrid perovskite crystals determines superior lattice ordering and stability. There are three types of ionic liquids-[Emim]BF4, EMIMNTF2, and HMITFSI-that can effectively enhance the X-ray photoelectric conversion performance of hybrid perovskite crystal CH3NH3PbI3 (MAPbI(3)), and the enhancement in the photocurrent leads to an improvement in the sensitivity of X-ray detectors. We soak the perovskite crystals in an ionic liquid and perform two treatment methods: electrification and dilution with ETOH solution. It is interesting to find that MAPbI(3) perovskite single crystal materials choose the same optimized ionic liquid species in X-ray detection and photovoltaic power generation applications, and the effect is quite the opposite. Compared with untreated MAPbI(3) crystals, the average photocurrent density of Electrify-HMITFSI MAPbI(3) increased by 826.85% under X-ray excitation and the sensitivity of X-ray detectors made from these treated MAPbI(3) crystals significantly increased by 72.6%, but the intensity of the PL spectrum decreased to 90% of the untreated intensity.
Keyword ：
X-ray photoelectric conversion X-ray photoelectric conversion MAPbI(3) crystals MAPbI(3) crystals X-ray detector X-ray detector ionic liquid treated ionic liquid treated perovskite perovskite
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| GB/T 7714 | Su, Xueqiong , Wang, Ruimin , Yu, Huimin et al. Improvement of X-ray Photoelectric Conversion Performance of MAPbI3 Perovskite Crystals by Ionic Liquid Treatment [J]. | COATINGS , 2024 , 14 (5) . |
| MLA | Su, Xueqiong et al. "Improvement of X-ray Photoelectric Conversion Performance of MAPbI3 Perovskite Crystals by Ionic Liquid Treatment" . | COATINGS 14 . 5 (2024) . |
| APA | Su, Xueqiong , Wang, Ruimin , Yu, Huimin , Wang, Jin , Chen, Ruixiang , Ma, He et al. Improvement of X-ray Photoelectric Conversion Performance of MAPbI3 Perovskite Crystals by Ionic Liquid Treatment . | COATINGS , 2024 , 14 (5) . |
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Abstract ：
Optically spatial displacement and material modification hold great potential for the appealing applications in nanofabrication and reconfiguration of functional optical devices. Here, we propose and demonstrate a scheme to achieve simultaneous deformation and phase change in vanadium dioxide (VO2)/Si3N4/Au hybrid nanostructures by laser stimuli. Low triggering threshold and significant deformation characteristics of VO2, based on controllable phase transition, are demonstrated in microscale cantilevers. The plasmonic properties of the nanostructure array are further utilized to achieve a polarization-selective dynamic response. The persistence of deformation and dynamical optical modulation are further demonstrated. Such high-precision fabrication methods and non-contact reconfiguration methods are useful for future applications in dynamic optical manipulation.
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| GB/T 7714 | Zhang, Xiaochen , Li, Yuan , Dong, Weikang et al. Optically controllable deformation and phase change in VO2/Si3N4/Au hybrid nanostructures with polarization selectivity [J]. | APL PHOTONICS , 2024 , 9 (7) . |
| MLA | Zhang, Xiaochen et al. "Optically controllable deformation and phase change in VO2/Si3N4/Au hybrid nanostructures with polarization selectivity" . | APL PHOTONICS 9 . 7 (2024) . |
| APA | Zhang, Xiaochen , Li, Yuan , Dong, Weikang , Liang, Qinghua , Sun, Haozhe , Wang, Yang et al. Optically controllable deformation and phase change in VO2/Si3N4/Au hybrid nanostructures with polarization selectivity . | APL PHOTONICS , 2024 , 9 (7) . |
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Abstract ：
A flexible actuator, which can convert external stimuli to mechanical motion, is an essential component of every soft robot and determines its performance. As a novel two-dimensional material, MXene has been used to fabricate flexible actuators due to its excellent physical properties. Although MXene-based actuators exhibit excellent actuation performance, their bending deformation is solely due to the in-plane isotropy of the MXene film, and an MXene torsional actuator has not been reported. This study presents a flexible torsional actuator based on an MXene-carbon nanotube (CNT)-paraffin wax (PW) film. In this actuator, the MXene thin film acts as a light absorption layer with wavelength selectivity, superaligned CNT provides structural anisotropy for the composite film, and PW acts as the active layer. The chirality and helical structure of the actuator could be tuned by the orientation of the CNT film. Such an actuator delivers excellent actuation performance, including high work density (similar to 1.2 J/cm3), low triggering power (77 mW/cm2), high rotational speed (320 degrees/s), long lifetime (30,000 cycles), and wavelength selectivity. Inspired by vines, we used the torsional actuator as a spiral grabber, which lifted an object that weighs 20 times more than the actuator. The high-performance torsional actuator would be potentially used as a noncontact sensor, rotary motor, and grabbing tool in the soft robot system.
Keyword ：
torsional actuator torsional actuator paraffin wax paraffin wax soft robot soft robot MXene MXene carbon nanotube carbon nanotube
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| GB/T 7714 | Ding, Jun , Ma, He , Xiao, Xiao et al. Flexible Torsional Photoactuators Based on MXene-Carbon Nanotube-Paraffin Wax Films [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 . |
| MLA | Ding, Jun et al. "Flexible Torsional Photoactuators Based on MXene-Carbon Nanotube-Paraffin Wax Films" . | ACS APPLIED MATERIALS & INTERFACES (2022) . |
| APA | Ding, Jun , Ma, He , Xiao, Xiao , Li, Qingwei , Liu, Kai , Zhang, Xinping . Flexible Torsional Photoactuators Based on MXene-Carbon Nanotube-Paraffin Wax Films . | ACS APPLIED MATERIALS & INTERFACES , 2022 . |
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Abstract ：
Microactuators that convert external stimuli such as heat, light, current, and magnetic field into mechanical motion are essential components in microelectro-mechanical systems. To date, microactuators have been fabricated mainly using conventional microfabrication technologies and inorganic thin films, but although such technologies facilitate the mass production of microdevices, they are expensive and lack flexibility when either preparing only a few devices or facing special needs. Laser-direct-writing is an effective complement to microfabrication, but is seldom used in the construction of inorganic microactuators. In this work, a laser-direct-writing technique on the freestanding vanadium dioxide (VO2) film for fabricating microactuators with arbitrary shapes is developed. The precision of the laser direct writing attained 2 mu m under ultralow pulse energy of 52 pJ. The pulse energy is two orders of magnitude lower than that needed for patterning VO2 film and other semiconductor materials on substrates. The overall performance of the resulting VO2 microactuators is comparable with that of those fabricated by conventional microfabrication technologies, but the fabricating efficiency and flexibility are increased. Such a fabrication strategy can also be used to fabricate other smart microdevices, such as strain sensors and photodetectors.
Keyword ：
laser direct writing laser direct writing microactuator microactuator phase transition phase transition vanadium dioxide vanadium dioxide
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| GB/T 7714 | Li, Yuan , Ma, He , Tang, Fawei et al. Direct Laser Writing of Multishaped VO2 Microactuators Based on Freestanding VO2 Film [J]. | ADVANCED MATERIALS TECHNOLOGIES , 2022 , 8 (1) . |
| MLA | Li, Yuan et al. "Direct Laser Writing of Multishaped VO2 Microactuators Based on Freestanding VO2 Film" . | ADVANCED MATERIALS TECHNOLOGIES 8 . 1 (2022) . |
| APA | Li, Yuan , Ma, He , Tang, Fawei , Li, Chenyu , Wang, Bolun , Song, Xiaoyan et al. Direct Laser Writing of Multishaped VO2 Microactuators Based on Freestanding VO2 Film . | ADVANCED MATERIALS TECHNOLOGIES , 2022 , 8 (1) . |
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Abstract ：
With the growing demand for broadband wireless communication, high-resolution radar, security inspection, and biological analysis, terahertz (THz) technology has made significant progress in recent years. The wide applications of THz technology benefited from the rapid development of various THz functional devices. Metasurface, an essential means of manipulating THz waves, has widely been applied in multiple THz functional devices. However, it is still a great challenge to construct flexible THz metasurface devices due to the lack of flexibility of traditional semiconductor and metal materials. In this work, a two-dimensional material, MXene, is used to prepare flexible metasurfaces with frequency filtering and polarization functions. By further combining with the phase-transition-material vanadium dioxide, the VO2/MXene metasurface exhibits good performance in amplitude modulation under electrical stimulation. The modulation depth of the device reaches 86% under a lower trigger power of 11.6 mW/mm(2) and the response time is only similar to 100 ms. Such a flexible active metasurface with superior performance and high integration will be useful in THz imaging systems, THz sensing systems, etc.
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| GB/T 7714 | Li, Yuan , Ma, He , Wang, Yu et al. Electrically driven active VO2/MXene metasurface for the terahertz modulation [J]. | APPLIED PHYSICS LETTERS , 2022 , 121 (24) . |
| MLA | Li, Yuan et al. "Electrically driven active VO2/MXene metasurface for the terahertz modulation" . | APPLIED PHYSICS LETTERS 121 . 24 (2022) . |
| APA | Li, Yuan , Ma, He , Wang, Yu , Ding, Jun , Qi, Limei , Fu, Yulan et al. Electrically driven active VO2/MXene metasurface for the terahertz modulation . | APPLIED PHYSICS LETTERS , 2022 , 121 (24) . |
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Abstract ：
一种基于二氧化钒相变的等离激元超表面超快偏振选择性光调制器，属于调制器技术领域。包括上下两层正交光栅，下层为金光栅结构，金光栅上为二氧化钒光栅，金光栅与二氧化钒光栅的栅线互相垂直。对与两栅线方向分别平行的两种线偏振光有着不同的局域场增强，产生的LSPR在不同波段，更有利于提高信噪比。采用光调控的方式引起二氧化钒相变，实现在亚皮秒时间内的超快调控。
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| GB/T 7714 | 富聿岚 , 姜茂杰 , 马赫 et al. 一种基于二氧化钒相变的等离激元超表面超快偏振选择性光调制器 : CN202210627387.8[P]. | 2022-06-01 . |
| MLA | 富聿岚 et al. "一种基于二氧化钒相变的等离激元超表面超快偏振选择性光调制器" : CN202210627387.8. | 2022-06-01 . |
| APA | 富聿岚 , 姜茂杰 , 马赫 , 张新平 . 一种基于二氧化钒相变的等离激元超表面超快偏振选择性光调制器 : CN202210627387.8. | 2022-06-01 . |
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