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2. Correction: The role of spinal cord neuroanatomy in the variances of epidural spinal recordings

Author

Lam, Danny V., Chin, Justin, Brucker-Hahn, Meagan K., Settell, Megan, Romanauski, Ben, Verma, Nishant, Upadhye, Aniruddha, Deshmukh, Ashlesha, Skubal, Aaron, Nishiyama, Yuichiro, Hao, Jian, Lujan, J. Luis, Zhang, Simeng, Knudsen, Bruce, Blanz, Stephan, Lempka, Scott F., Ludwig, Kip A., Shoffstall, Andrew J., Park, Hyun-Joo, Ellison, Erika Ross, Zhang, Mingming, and Lavrov, Igor

Published
2024
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4. The role of spinal cord neuroanatomy in the variances of epidural spinal recordings

Author

Lam, Danny V., Chin, Justin, Brucker-Hahn, Meagan K., Settell, Megan, Romanauski, Ben, Verma, Nishant, Upadhye, Aniruddha, Deshmukh, Ashlesha, Skubal, Aaron, Nishiyama, Yuichiro, Hao, Jian, Lujan, J. Luis, Zhang, Simeng, Knudsen, Bruce, Blanz, Stephan, Lempka, Scott F., Ludwig, Kip A., Shoffstall, Andrew J., Park, Hyun-Joo, Ellison, Erika Ross, Zhang, Mingming, and Lavrov, Igor

Published
2024
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17. Tight focusing field of cylindrical vector beams based on cascaded low-refractive index metamaterials

Author

Ke Lan, Li Chenxia, Zhang Simeng, Fang Bo, Tang Ying, Hong Zhi, and Jing Xufeng

Subjects
3d printing, cascade, metamaterial, metasurface, terahertz, vector light, Physics, QC1-999
Abstract

Using low-refractive-index metamaterials, we design a transmission-type radial-angular cylindrical vector beam generator. A high numerical aperture lens is constructed using an asymmetric meta-grating structure. The metamaterial vector beam generator and the meta-grating lens are physically cascaded to obtain the tight focusing characteristics of the vector light field. The vector beam generator module and the meta-lens module are prepared by 3D printing technology, and the near-field test has been carried out on the samples in the terahertz band. Using the physical cascading method, two modules are cascaded to construct a vector beam tight focusing device, and the focusing electric field distribution test has been carried out. The use of 3D printing technology for sample preparation further reduces the manufacturing difficulty and production cost, and ensures the realization of its design function on the basis of miniaturization and light weight, which provides the possibility for the research of tight focusing field regulation in the terahertz band.

Published
2023
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19. High-Performance Logic and Memory Devices Based on a Dual-Gated MoS2 Architecture

Author

Liao, Fuyou, Guo, Zhongxun, Wang, Yin, Xie, Yufeng, Zhang, Simeng, Sheng, Yaochen, Tang, Hongwei, Xu, Zihan, Riaud, Antoine, Zhou, Peng, Wan, Jing, Fuhrer, Michael S., Jiang, Xiangwei, Zhang, David Wei, Chai, Yang, and Bao, Wenzhong

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

In this work, we demonstrate a dual-gated (DG) MoS2 field effect transistors (FETs) in which the degraded switching performance of multilayer MoS2 can be compensated by the DG structure. It produces large current density (>100 {\mu}A/{\mu}m for a monolayer), steep subthreshold swing (SS) (~100 mV/dec for 5 nm thickness), and high on/off current ratio (greater than 107 for 10 nm thickness). Such DG structure not only improves electrostatic control but also provides an extra degree of freedom for manipulating the threshold voltage (VTH) and SS by separately tuning the top and back gate voltages, which are demonstrated in a logic inverter. Dynamic random access memory (DRAM) has a short retention time because of large OFF-state current in the Si MOSFET. Based on our DG MoS2-FETs, and a DRAM unit cell with a long retention time of 1260 ms are realized. A large-scale isolated MoS2 DG-FETs based on CVD-synthesized continuous films is also demonstrated, which shows potential applications for future wafer-scale digital and low-power electronics.

Published
2019

28. Stacking monolayers at will: A scalable device optimization strategy for two-dimensional semiconductors

Author

Guo, Xiaojiao, Chen, Honglei, Bian, Jihong, Liao, Fuyou, Ma, Jingyi, Zhang, Simeng, Zhang, Xinzhi, Zhu, Junqiang, Luo, Chen, Zhang, Zijian, Zong, Lingyi, Xia, Yin, Sheng, Chuming, Xu, Zihan, Gou, Saifei, Wang, Xinyu, Gong, Peng, Liu, Liwei, Jiang, Xixi, An, Zhenghua, Cong, Chunxiao, Qiu, Zhijun, Wu, Xing, Zhou, Peng, Chen, Xinyu, Tong, Ling, and Bao, Wenzhong

Published
2022
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31. Controlled Doping of Wafer‐Scale PtSe2 Films for Device Application

Author

Xu, Hu, Zhang, Haima, Liu, Yawen, Zhang, Simeng, Sun, Yangye, Guo, Zhongxun, Sheng, Yaochen, Wang, Xudong, Luo, Chen, Wu, Xing, Wang, Jianlu, Hu, Weida, Xu, Zihan, Sun, Qingqing, Zhou, Peng, Shi, Jing, Sun, Zhengzong, Zhang, David Wei, and Bao, Wenzhong

Subjects
controlled doping, field effect transistors, PtSe2, transition metal dichalcogenides, Physical Sciences, Chemical Sciences, Engineering, Materials
Abstract

Semiconductive transition metal dichalcogenides (TMDs) have been considered as next generation semiconductors, but to date most device investigations are still based on microscale exfoliation with a low yield. Wafer scale growth of TMDs has been reported but effective doping approaches remain challenging due to their atomically thick nature. This work reports the synthesis of wafer-scale continuous few-layer PtSe2 films with effective doping in a controllable manner. Chemical component analyses confirm that both n-doping and p-doping can be effectively modulated through a controlled selenization process. The electrical properties of PtSe2 films have been systematically studied by fabricating top-gated field effect transistors (FETs). The device current on/off ratio is optimized in two-layer PtSe2 FETs, and four-terminal configuration displays a reasonably high effective field effect mobility (14 and 15 cm2 V−1 s−1 for p-type and n-type FETs, respectively) with a nearly symmetric p-type and n-type performance. Temperature dependent measurement reveals that the variable range hopping is dominant at low temperatures. To further establish feasible application based on controllable doping of PtSe2, a logic inverter and vertically stacked p–n junction arrays are demonstrated. These results validate that PtSe2 is a promising candidate among the family of TMDs for future functional electronic applications.

Published
2019

33. A Universal Self‐Propagating Synthesis of Aluminum‐Based Oxyhalide Solid‐State Electrolytes

Author

Zhang, Simeng, primary, Xu, Yang, additional, Wu, Han, additional, Pang, Tianlu, additional, Zhang, Nian, additional, Zhao, Changtai, additional, Yue, Junyi, additional, Fu, Jiamin, additional, Xia, Shengjie, additional, Zhu, Xiangzhen, additional, Wang, Guanzhi, additional, Duan, Hui, additional, Xiao, Biwei, additional, Mei, Tao, additional, Liang, Jianwen, additional, Sun, Xueliang, additional, and Li, Xiaona, additional

Published
2024
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35. Humic Polyelectrolytes Facilitate Rapid Microwave Synthesis of Silver Nanoparticles Suitable for Wound-Healing Applications

Author

Zhang, Yu, primary, Larionov, Konstantin S., additional, Zhang, Simeng, additional, Sobolev, Nikita A., additional, Konstantinov, Andrey I., additional, Volkov, Dmitry S., additional, Suslova, Evgeniya V., additional, Chernov, Vladimir E., additional, Poloskov, Anton I., additional, Glushakov, Ruslan I., additional, and Perminova, Irina V., additional

Published
2024
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41. The role of spinal cord neuroanatomy and the variances of epidurally evoked spinal responses.

Author

Lam, Danny V., Chin, Justin, Brucker-Hahn, Meagan K., Settell, Megan, Romanauski, Ben, Verma, Nishant, Upadhye, Aniruddha, Deshmukh, Ashlesha, Skubal, Aaron, Nishiyama, Yuichiro, Hao, Jian, Lujan, J. Luis, Zhang, Simeng, Knudsen, Bruce, Blanz, Stephan, Lempka, Scott F., Ludwig, Kip A., Shoffstall, Andrew J., Park, Hyun-Joo, and Ellison, Erika Ross

Subjects
SPINAL cord, CONE beam computed tomography, NEUROANATOMY, ACTION potentials, SPINE, INTERVERTEBRAL disk, EPIDURAL space
Abstract

Background: Spinal cord stimulation (SCS) has demonstrated multiple benefits in treating chronic pain and other clinical disorders related to sensorimotor dysfunctions. However, the underlying mechanisms are still not fully understood, including how electrode placement in relation to the spinal cord neuroanatomy influences epidural spinal recordings (ESRs). To characterize this relationship, this study utilized stimulation applied at various anatomical sections of the spinal column, including at levels of the intervertebral disc and regions correlating to the dorsal root entry zone. Method: Two electrode arrays were surgically implanted into the dorsal epidural space of the swine. The stimulation leads were positioned such that the caudal-most electrode contact was at the level of a thoracic intervertebral segment. Intraoperative cone beam computed tomography (CBCT) images were utilized to precisely determine the location of the epidural leads relative to the spinal column. High-resolution microCT imaging and 3D-model reconstructions of the explanted spinal cord illustrated precise positioning and dimensions of the epidural leads in relation to the surrounding neuroanatomy, including the spinal rootlets of the dorsal and ventral columns of the spinal cord. In a separate swine cohort, implanted epidural leads were used for SCS and recording evoked ESRs. Results: Reconstructed 3D-models of the swine spinal cord with epidural lead implants demonstrated considerable distinctions in the dimensions of a single electrode contact on a standard industry epidural stimulation lead compared to dorsal rootlets at the dorsal root entry zone (DREZ). At the intervertebral segment, it was observed that a single electrode contact may cover 20-25% of the DREZ if positioned laterally. Electrode contacts were estimated to be ~0.75 mm from the margins of the DREZ when placed at the midline. Furthermore, ventral rootlets were observed to travel in proximity and parallel to dorsal rootlets at this level prior to separation into their respective sides of the spinal cord. Cathodic stimulation at the level of the intervertebral disc, compared to an 'off-disc' stimulation (7 mm rostral), demonstrated considerable variations in the features of recorded ESRs, such as amplitude and shape, and evoked unintended motor activation at lower stimulation thresholds. This substantial change may be due to the influence of nearby ventral roots. To further illustrate the influence of rootlet activation vs. dorsal column activation, the stimulation lead was displaced laterally at ~2.88 mm from the midline, resulting in variances in both evoked compound action potential (ECAP) components and electromyography (EMG) components in ESRs at lower stimulation thresholds. Conclusion: The results of this study suggest that the ECAP and EMG components of recorded ESRs can vary depending on small differences in the location of the stimulating electrodes within the spinal anatomy, such as at the level of the intervertebral segment. Furthermore, the effects of sub-centimeter lateral displacement of the stimulation lead from the midline, leading to significant changes in electrophysiological metrics. The results of this pilot study reveal the importance of the small displacement of the electrodes that can cause significant changes to evoked responses SCS. These results may provide further valuable insights into the underlying mechanisms and assist in optimizing future SCS-related applications. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Metabolic flexibility during sleep

Author

Zhang, Simeng, Tanaka, Yoshiaki, Ishihara, Asuka, Uchizawa, Akiko, Park, Insung, Iwayama, Kaito, Ogata, Hitomi, Yajima, Katsuhiko, Omi, Naomi, Satoh, Makoto, Yanagisawa, Masashi, Sagayama, Hiroyuki, and Tokuyama, Kumpei

Published
2021
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