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| 1 | Free control of far-field scattering angle of transmission terahertz wave using multilayer split-ring resonators'metasurfaces显示文摘To enhance transmission eficiency of Pancharatnam Berry(PB)phase metasurfaces,multilayer split-ring resonators were proposed to develop encoding sequences.As per the generalized Snell's law,the deflection angle of the PB phase encoding metasurfaces depends on the metasurface period's size.Therefore,it is impossible to design an infinitesimal metasurface unit;consequently,the continuous transmission scattering angle cannot be obtained.In digital signal processing,this study introduces the Fourier convolution principle on encoding metasurface sequences to freely control the trausmitted scattering angles.Both addition and subtraction operations between two diferent encoding sequences were then performed to achieve the continuous variation of the scattering angle.Furthermore,we established that the Fourier convolution principle can be applied to the checkerboard coded metasur-faces. | Ying Tian Xufeng Jing Haiyong Gan Chenxia Li Zhi Hong | 2020 | Frontiers of physics2020，15，6： | 2 |
| 2 | Spatial and spectral measurement of laser-driven protons through radioactivation显示文摘The simultaneous measurement of the spatial profile and spectrum of laser-accelerated protons is important for further optimization of the beam qualities and applications.We report a detailed study regarding the underlying physics and regular procedure of such a measurement through the radioactivation of a stack composed of aluminum,copper,and CR-39 plates as well as radiochromic films(RCFs).After being radioactivated,the copper plates are placed on imaging plates(IPs)to detect the positrons emitted by the reaction products through contact imaging.The spectrum and energy-dependent spatial profile of the protons are then obtained from the IPs and confirmed by the measured ones from the RCFs and CR-39 plates.We also discuss the detection range,influence of electrons,radiation safety,and spatial resolution of this measurement.Finally,insights regarding the extension of the current method to online measurements and dynamic proton imaging are also provided. | Yin‑Ren Shou Xue‑Zhi Wu Gwang‑Eun Ahn Seung Yeon Kim Seong Hoon Kim Hwang Woon Lee Jin Woo Yoon Jae Hee Sung Seong Ku Lee Xue‑Qing Yan Il Woo Choi Chang Hee Nam | 2023 | Nuclear Science and Techniques2023，34，12： | 0 |
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