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Enhanced absorption and electrical modulation of graphene based on the parity-time symmetry optical structure

Chinese Optics Letters 2022年第2期20卷 136-141页

作者： Lingjun Yi Changhong Li School of Electronic Information Qingdao UniversityQingdao 266071China

In order to realize the ultrastrong absorption of graphene with electrical modulation properties, we designed a composite structure of graphene and parity-time(PT) symmetry photonic crystal, which is achieved by placing the graphene layer on the top layer of the PT symmetry photonic crystal. In this paper, the absorption properties of graphene and the electrical modulating properties of the structure were theoretically analyzed based on the transfer matrix method. The result shows that the proposed structure can achieve the absorption of 31.5 d B for the communication wavelength of 1550 nm;meanwhile,by setting the electric field intensity to ±0.02 V/nm, the absorption of graphene can be largely modulated to realize an electrically switchable effect, the modulation depth of graphene absorption can reach nearly 100%, and the operation speed is also close to 8.171 GHz. This investigation provides a novel approach to design graphene-based optoelectronic devices and optical communication devices.

关键词： parity-time symmetry ultrastrong absorption electrical modulation graphene transfer matrix method

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Stimulation strategies for electrical and magnetic modulation of cells and tissues

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Cell Regeneration 2023年第1期12卷 174-192页

作者： Suleyman A.Omer Kaitlyn H.McKnight Lucas I.Young Shang Song Department of Biomedical Engineering The University of ArizonaTucsonAZUSA Departments of Neuroscience GIDP Materials Science and EngineeringBIO5 InstituteThe University of ArizonaTucsonAZUSA

electrical phenomena play an important role in numerous biological processes including cellular signaling,early embryogenesis,tissue repair and remodeling,and growth of *** and magnetic effects have been studied on a variety of stimulation strategies and cell types regarding cellular functions and disease *** this review,we discuss recent advances in using three different stimulation strategies,namely electrical stimulation via conductive and piezoelectric materials as well as magnetic stimulation via magnetic materials,to modulate cell and tissue *** three strategies offer distinct stimulation routes given specific material *** review will evaluate material properties and biological response for these stimulation strategies with respect to their potential applications in neural and musculoskeletal research.

关键词： Stimulation strategy electrical modulation Stem cells Neural recovery Musculoskeletal regeneration Conductive Piezoelectric Magnetic Tissue engineering Regenerative medicine

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electrical control of excitonic oscillator strength and spatial distribution in a monolayer semiconductor

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Nano Research 2024年第9期17卷 8424-8430页

作者： Yanming Wang Junrong Zhang Tianhua Ren Meng Xia Long Fang Xiangyi Wang Xingwang Zhang Kai Zhang Junyong Wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacao 999078China College of New Energy Inner Mongolia University of TechnologyHohhot 010051China

electrical modulation of luminescence is significant to modern light-emitting *** transition metal dichalcogenides are emerging direct-bandgap luminescent materials with unique excitonic properties,and the multiple exciton complexes provide new opportunities to modulate the property of luminescence in atomically thin ***,we report an electrical control of exciton emission in the oscillator strength and spatial distribution of excitons in a monolayer *** modulation of excitonic emission intensity with a degree of modulation of~92%has been demonstrated by an electric field at room *** spatial carrier redistribution tuned by a lateral electric field results in distinct excitonic emission patterns by *** modulation approach to exciton oscillator strength and distribution provides an efficient way to investigate the exciton diffusion dynamics and to construct electrically tunable optoelectronic devices.

关键词： monolayer semiconductor exciton electrical modulation spatial distribution

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electrically tunable optical metasurfaces

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Photonics Insights 2024年第3期3卷 210-262页

作者： Fei Ding Chao Meng Sergey I.Bozhevolnyi Centre for Nano Optics University of Southern DenmarkOdenseDenmark

Optical metasurfaces have emerged as a groundbreaking technology in photonics,offering unparalleled control over light-matter interactions at the subwavelength scale with ultrathin surface nanostructures and thereby giving birth to flat *** most reported optical metasurfaces are static,featuring well-defined optical responses determined by their compositions and configurations set during fabrication,dynamic optical metasurfaces with reconfigurable functionalities by applying thermal,electrical,or optical stimuli have become increasingly more in demand and moved to the forefront of research and *** various types of dynamically controlled metasurfaces,electrically tunable optical metasurfaces have shown great promise due to their fast response time,low power consumption,and compatibility with existing electronic control systems,offering unique possibilities for dynamic tunability of light–matter interactions via electrical *** we provide a comprehensive overview of the state-of-the-art design methodologies and technologies explored in this rapidly evolving *** work delves into the fundamental principles of electrical modulation,various materials and mechanisms enabling tunability,and representative applications for active light-field manipulation,including optical amplitude and phase modulators,tunable polarization optics and wavelength filters,and dynamic waveshaping optics,including holograms and *** review terminates with our perspectives on the future development of electrically triggered optical metasurfaces.

关键词： optical metasurfaces electrical modulation electro-optic materials micro-electromechanical and nanoelectromechanical systems

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