4篇
您的检索式：作者名="ZHANG Guohang"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Principles to tailor the saturable and reverse saturable absorption of epsilon-near-zero material显示文摘Indium tin oxide(ITO) films have recently emerged as a new class of functional materials for nonlinear optical(NLO) devices due to their exotic properties around epsilon-near-zero(ENZ) wavelength. Here, we experimentally investigated and tailored the NLO absorption properties of ITO films. The NLO absorption response of ITO films is investigated by using the femtosecond Z-scan measurement technique at two different wavelengths of 1030 nm(out of ENZ region) and 1440 nm(within ENZ region). Interestingly, we observed conversion behavior from saturable absorption(SA) to reverse saturable absorption(RSA) at 1030 nm with the increasing incident laser intensity, whereas only SA behavior was observed at 1440 nm. We demonstrate that SA behavior was ascribed to ground-state free electrons bleaching in the conduction band, and RSA was attributed to three-photon absorption. Moreover, results reveal that ITO film shows more excellent SA performance at 1440 nm with a nonlinear absorption coefficient of ~-23.2 cm∕GW and a figure of merit of ~1.22 × 10^(-16) esu · cm.Furthermore, we tailored the SA and RSA behaviors of ITO films at 1030 and 1440 nm wavelengths via post-annealing treatment. The modulatable NLO absorption was ascribed to the changing of free-carrier concentration in ITO films via annealing treatment. The experimental findings offered an inroad for researchers to tailor its NLO absorption properties by changing the free-carrier concentration through chemical modification such as annealing, oxidation, or defect implantation. The superior and tunable nonlinear optical response suggests that ITO film might be employed as a new class material with potential applications in novel optical switches or optical limiters to realize the all-optical information process. | HAO MA YUANAN ZHAO YUCHEN SHAO YAFEI LIAN WEILI ZHANG GUOHANG HU YUXIN LENG JIANDA SHAO | 2021 | Photonics Research2021，9，5： | 2 |
| 2 | DFH-5 Platform Development Speeds Up显示文摘Recently,multiple critical technologies have been mastered in the DFH-5satellite platform development.The DFH-5 satellite platform is the next-generation geosynchronous orbitplatform,with capacity and technical specifications at an international advanced level.The development of the platform leads in technical innovation in spacecraft development and drives the upgrade of | SHI Xiaodan ZHANG Guohang | 2015 | Aerospace China2015，16，4： | 1 |
| 3 | Towards reinforcement learning in UAV relay for anti-jamming maritime communications显示文摘Maritime communications with sea surface reflections and sea wave occlusions are susceptible to jamming attacks due to the wide geographical area and intensive wireless communication services.Unmanned Aerial Vehicles(UAVs)help relay messages to improve communication performance,but the relay policy that depends on the rapidly changing maritime environments is difficult to optimize.In this paper,a reinforcement learning-based UAV relay policy for maritime communications is proposed to resist jamming attacks.Based on previous transmission performance,the relay location,the received power of the transmitted signal and the received jamming power,this scheme optimizes the UAV trajectory and relay power to save the energy consumption and decrease the Bit-Error-Rate(BER)of the maritime signals.A deep reinforcement learning-based scheme is also proposed,which designs a deep neural network with dueling architecture to further improve the communication performance and computational complexity.The performance bounds regarding the signal to interference plus noise ratio,energy consumption and the communication utility are provided based on the Nash equilibrium of the game against jamming,and the computational complexity of the proposed schemes is analyzed.Simulation results show that the proposed schemes improve the energy efficiency and decrease the BER compared with the benchmark. | Chuhuan Liu Yi Zhang Guohang Niu Luliang Jia Liang Xiao Jiangxia Luan | 2023 | Digital Communications and Networks2023，9，6： | 0 |
| 4 | Wireless Laser Power Transmission System for Dynamic Target Using Rotation of Single Component显示文摘We design a novel wireless laser power transmission system in which the process of wireless power transmission to a dynamic target was completed based on the rotation of just one component.The design of this system not only reduces the loadbearing of the gimbal,but also avoids the degradation of beam quality caused by lens vibration when tracking dynamic targets.As a result,this WLPT system has been verified by tracking an unmanned aerial vehicle at 122 m away with an offset distance of±26.7 mm.We believe this system offers great potential in highpower,longdistance dynamic laser power transmission. | Zhang Shuaiyu Hu Guohang Wang Lin Liu Yongjiang Wei Ling Zheng Yifan Shao Yuchuan | 2022 | 激光与光电子学进展2022，59，17： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员