Yating Shi

Xiamen University

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Shiyuan Liu

Huazhong University of Science and Technology

Hao Jiang

Anhui University of Science and Technology

Wenxi Guo

Xiamen University

Xiuguo Chen

Huazhong University of Science and Technology

Honggang Gu

Huazhong University of Science and Technology

Meidan Ye

Xiamen University

Jiandong Ye

Nanjing University

Hao Wu

Shanxi Normal University

Hai Lu

Nanjing University

Fangfang Ren

Nanjing University

Cooperative Institutions

Xiamen University

Chinese Academy of Sciences

Nanjing University

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

Tianjin University

Xiamen University of Technology

Xi'an Jiaotong University

Collaborative Innovation Center of Advanced Microstructures

Shanxi Normal University

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Ag-cap-enhanced upconversion luminescence of micropillars with unidirectional radiation

Optica (2023)

Linshuo Gao Yating Shi Feng Xu Sen Yang Yinghao Wei

Exploration of plasmonic structures to enhance upconversion luminescence (UCL) attracts attention because faint UCL from a material is a bottleneck for its applications. We designed and prepared three easily realized structures to improve the UCL of β -NaYF 4 :Yb 3 , Er 3+ micropillar (MP), and compared them to a reference structure on glass on single particles. We achieved a 43-fold UCL enhancement with the MPs with an Ag cap.The experimental results and simulations indicated that the improvements in excitation field and radiation direction collectively enhanced the MP UCL. We validated the captured radiation patterns generated from various structures by excitation simulations and provide a rational criterion for cavity design.

Photon Upconversion

10.1364/optica.505129

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Nondestructive analysis of lithographic patterns with natural line edge roughness from Mueller matrix ellipsometric data

Applied Surface Science (2015)

Xiuguo Chen Yating Shi Hao Jiang Chuanwei Zhang Shiyuan Liu

Ellipsometry

Mueller calculus

Line (geometry)

Matrix (chemical analysis)

10.1016/j.apsusc.2015.10.167

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Citations (14)

Highly Stretchable, Adhesive, and Self‐Healing Silk Fibroin‐Dopted Hydrogels for Wearable Sensors

Advanced Healthcare Materials (2021)

Zhao Li Jizhong Zhao Fan Zhang Zijie Xu Fan Chen

Adv. Healthcare Mater. 2021, 10, 2002083 DOI: 10.1002/adhm.202002083 In the published version of this article, the word "doped" in misspelled as "dopted" throughout the article. This mistake appears in the Title, the Abstract, the Introduction, and Conclusion. The correct title is: Highly Stretchable, Adhesive, and Self-Healing Silk Fibroin-Doped Hydrogels for Wearable Sensors The correct sentence in the Abstract is: Here, a simple one-pot method of thermal polymerization is introduced to fabricate silk fibroin-doped hydrogels (SFHs), which are both chemically and physically cross-linked by acrylamide (AM), acrylic acid (AA), and silk fibroin (SF). The correct sentence in the Introduction is: The addition of SF solution can improve the water retention property of silk fibroin-doped hydrogels (SFHs),[42] and effectively increases the mechanical properties. The correct sentence in the Conclusion is: In summary, we have prepared a chemical and physical cross-linked network hydrogel doped by SF with one-pot method of thermal polymerization. The editorial office apologizes for this oversight and for any confusion caused.

Fibroin

10.1002/adhm.202101062

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Citations (9)

Sensock: 3D Foot Reconstruction with Flexible Sensors

Hechuan Zhang Zhiyong Chen Shihui Guo Juncong Lin Yating Shi

Capturing 3D foot models is important for applications such as manufacturing customized shoes and creating clubfoot orthotics. In this paper, we propose a novel prototype, Sensock, to offer a fully wearable solution for the task of 3D foot reconstruction. The prototype consists of four soft stretchable sensors, made from silk fibroin yarn. We identify four characteristic foot girths based on the existing knowledge of foot anatomy, and measure their lengths with the resistance value of the stretchable sensors. A learning-based model is trained offline and maps the foot girths to the corresponding 3D foot shapes. We compare our method with existing solutions using red-green-blue (RGB) or RGBD (RGB-depth) cameras, and show the advantages of our method in terms of both efficiency and accuracy. In the user experiment, we find that the relative error of Sensock is lower than 0.55%. It performs consistently across different trials and is considered comfortable and suitable for long-term wearing.

Foot (prosody)

RGB color model

Orthotics

10.1145/3313831.3376387

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Realization of p-type gallium nitride by magnesium ion implantation for vertical power devices

Scientific Reports (2019)

Yating Shi Fangfang Ren Weizong Xu Xuanhu Chen Jiandong Ye

Abstract Implementing selective-area p-type doping through ion implantation is the most attractive choice for the fabrication of GaN-based bipolar power and related devices. However, the low activation efficiency of magnesium (Mg) ions and the inevitable surface decomposition during high-temperature activation annealing process still limit the use of this technology for GaN-based devices. In this work, we demonstrate successful p-type doping of GaN using protective coatings during a Mg ion implantation and thermal activation process. The p-type conduction of GaN is evidenced by the positive Seebeck coefficient obtained during thermopower characterization. On this basis, a GaN p-i-n diode is fabricated, exhibiting distinct rectifying characteristics with a turn-on voltage of 3 V with an acceptable reverse breakdown voltage of 300 V. Electron beam induced current (EBIC) and electroluminescent (EL) results further confirm the formation of p-type region due to Mg ion implantation and subsequent thermal activation. This repeatable and uniform manufacturing process can be implemented in mass production of GaN devices for versatile power and optoelectronic applications.

Dopant Activation

10.1038/s41598-019-45177-0

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Citations (27)

Highly Stretchable, Adhesive, and Self‐Healing Silk Fibroin‐Dopted Hydrogels for Wearable Sensors

Advanced Healthcare Materials (2021)

Zhao Li Jizhong Zhao Fan Zhang Zijie Xu Fan Chen

Abstract In recent years, the preparations of flexible electronic devices have attracted great attention. Here, a simple one‐pot method of thermal polymerization is introduced to fabricate silk fibroin‐dopted hydrogels (SFHs), which are both chemically and physically cross‐linked by acrylamide (AM), acrylic acid (AA), and silk fibroin (SF). The addition of SF can effectively enhance the mechanical property of the SFH 12% by 59% compared with SFH 0% . Taking the advantage of its wide working range of stress (about 0.455–568.9 kPa), the SFH can work as a resistance‐type pressure sensor to monitor different human motions. What is more, the excellent adhesion, about 75.17 N m −1 of SFH 46% enables it to fit tightly to other objects during the testing, which significantly reduces the loss of small signals due to poor fit. In addition, the SFH demonstrates excellent self‐healing property without requiring external excitation and a sensitive temperature response in the range of −10 to 60 °C. The SFH is expected to be applied in the field of electronic skin, soft robots, and other flexible electronic products as well as speech recognition.

Fibroin

10.1002/adhm.202002083

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Citations (66)

Improved nanostructure reconstruction by performing data refinement in optical scatterometry

Journal of Optics (2015)

Jinlong Zhu Hao Jiang Yating Shi Xiuguo Chen Chuanwei Zhang

Recently, we have indirectly demonstrated that nanostructure reconstruction accuracy is degraded by the outliers in optical scatterometry, and we have applied the robust estimation method to suppress these outliers. However, the existence of a possible heavy masking effect could result in the risk of low measurement accuracy, since the detection of outliers is simply based on the judgment of residual value. In this work, a novel method is introduced to directly detect outliers, which can provide the intuitional display of outliers in a two-dimensional coordinate system. Moreover, a robust correction step based on the principle of least trimmed squared estimator regression is proposed to replace the conventional Gauss–Newton iteration step, by which the more reliable and accurate nanostructure reconstruction is achieved. The improved reconstruction of a one-dimensional etched Si grating has demonstrated the feasibility of the proposed methods.

RANSAC

10.1088/2040-8978/18/1/015605

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Citations (5)

B-Site and Oxygen Vacancy Tuning of Free-Standing La_0.8Sr_0.2Ni_xCu_1–xO₃/Multiwalled Carbon Nanotube Paper for Low Overpotential Long-Cycling Li-CO₂ Batteries

ACS Applied Nano Materials (2024)

Wenjing Zhang Yating Shi Liying Ma Biao Chen Jianli Kang

10.1021/acsanm.4c03735

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Fast and accurate solution of inverse problem in optical scatterometry using heuristic search and robust correction

Journal of Vacuum Science & Technology B Nanotechnology and Microelectronics Materials Processing Measurement and Phenomena (2015)

Jinlong Zhu Hao Jiang Yating Shi Chuanwei Zhang Xiuguo Chen

Library search is one of the most commonly used methods in optical scatterometry, which consists of the beforehand construction of a signature library and the grid search. The efficiency of existing search algorithms such as k-dimensional tree method and locality-sensitive hashing heavily depends on the size of the signature library and usually is inversely proportional to the library scale. Additionally, since the two-norm based objective function is quite sensitive to the outliers, the abnormally distributed measurement errors will bias the solution of the traditional chi-square or maximum likelihood function. In the present paper, the authors propose a heuristic search algorithm and a robust correction method to realize the fast library search and to achieve the more accurate results, respectively. Instead of searching in the signature library, the authors perform the search procedure in an extra constructed Jacobian library using the principle of gradient-based iteration algorithms, by which the fast search speed can be achieved for an arbitrary scale library. After the search, a robust correction procedure is performed on the basis of the searched optimal parameter set to obtain the more accurate results. Simulations and experiments performed on an etched silicon grating have demonstrated the feasibility of the proposed heuristic search algorithm and robust correction method.

Hyperparameter Optimization

10.1116/1.4919713

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Citations (5)

Performance Enhancement of Planar GaAs Photoconductive Semiconductor Switches by Introducing p-Type Epitaxial Layer

Photonics (2025)

Jiawei Zong Yating Shi Guang Qian Jinpeng Wang Zelu Wei

Gallium arsenide photoconductive semiconductor switches (GaAs PCSSs) have attracted much attention in pulsed power systems and high-power microwave sources. The quality of ohmic contact has a significant impact on their switching performance. In this article, a 100 nm p-type epitaxial layer and Ti/Pt/Au metal electrodes were introduced into a GaAs PCSS to enhance ohmic contact, resulting in a specific contact resistivity of 3 × 10−4 Ω·cm2. The optimized device exhibited a reduction in dark current from 32.2 μA to 11.7 μA and achieved a peak pulse output of 4 kV under a bias of 8.1 kV. This work provides a new feasible approach for high-power miniaturized solid switches.

Photoconductivity

10.3390/photonics12020152

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