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Optically controlled dielectric metasurfaces for dynamic dual-mode modulation on terahertz waves

Advanced Photonics 2023年第2期5卷 70-79页

作者： Haoyang Zhou Sheng Zhang Shunjia Wang Yao Yao Qingnan Cai Jing Lin Xiaoying Zheng Zhuo Wang Zhensheng Tao Qiong He Lei Zhou Fudan University Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Department of PhysicsState Key Laboratory of Surface PhysicsShanghaiChina

dynamically controlling terahertz(THz)waves with an ultracompact device is highly desired,but previously realized tunable devices are bulky in size and/or exhibit limited light-tuning ***,we experimentally demonstrate dynamic modulation on THz waves with a dielectric metasurface in modeselective or mode-unselective manners through pumping the system at different optical ***-normal-mode theory reveals that the physics is governed by the spatial overlap between wave functions of resonant modes and regions inside resonators perturbed by pump laser excitation at different *** further design/fabricate a dielectric metasurface and experimentally demonstrate that it can dynamically control the polarization state of incident THz waves,dictated by the strength and wavelength of the pumping *** finally numerically demonstrate pump wavelength-controlled optical information encryption based on a carefully designed dielectric *** studies reveal that pump light wavelength can be a new external knob to dynamically control THz waves,which may inspire many tunable metadevices with diversified functionalities.

关键词： dynamic metasurfaces terahertz quasi-normal-mode theory optical pumping.

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Effects of realistic reradiation models in digital reconfigurable intelligent surfaces

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Journal of Information and Intelligence 2023年第3期1卷 238-252页

作者： Marco Di Renzo Abdelhamed Mohamed Alessio Zappone Gabriele Gradoni Marco Rossi Massimo Moccia Giuseppe Castaldi Vincenzo Galdi Universite Paris-Saclay CNRSCentraleSupelecLaboratoire des Signaux et Systemes3 Rue Joliot-CurieGif-sur-Yvette 91192France University of Cassino and Lazio Meridionale Department of Electrical and Information EngineeringVia Gaetano Di Biasio 43Cassino(FR)03043Italy University of Nottingham School of Mathematical Sciences and Department of Electrical and Electronics EngineeringUniversity ParkNottingham NG72RDUK dUniversity of Cambridge Department of Computer Science and Technology15 J.J.Thomson AvenueCambridge CB30FDUK University of Sannio Department of EngineeringCorso Garibaldi 107Benevento 82100Italy

Reconfigurable intelligent surfaces(RISs)are a promising technology for wireless communication applications,but their performance is often optimized using simplified electromagnetic reradiation *** this study,we explore the impact on the RIS performance of more realistic assumptions,including the(possibly imperfect)quantization of the reflection coefficients,subwavelength inter-element spacing,near-field location,and presence of electromagnetic *** find that design constraints can cause an RIS to reradiate power in unwanted ***,it is important to optimize an RIS by considering the entire reradiation ***,our study indicates that a 2-bit digitally controllable RIS with a nearly constant reflection amplitude and RIS elements with a size and inter-element spacing between(1/8)th and(1/4)th of the signal wavelength may offer a reasonable tradeoff between performance,complexity,and cost.

关键词： Wireless communications Reconfigurable intelligent surfaces dynamic metasurfaces Modeling Performance evaluation Optimization

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