Broadband and large-depth terahertz modulation by self-assembly monolayer silver nanoparticle arrays

Lai, Weien; Zhu, Qing; Liu, Gen; Shi, Guo Hai; Gan, Yichen; Amini, Abbas; Cheng, Chun

doi:10.1088/1361-6463/ac9ac5

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…To the best of our knowledge, there is a lack of knowledge on how to achieve the broadband and precise reconfigurable EMM in the low-frequency band of several megahertz [42] which is the primary frequency band for the implementation of WPT [43,44]. Moreover, limited by the requirements of low-power consumption and compactness, the existing reconfigurable EMMs [45][46][47][48][49][50][51], parallel to the direction of the magnetic field, cannot be directly applied to a WPT system.…”

Section: Introductionmentioning

confidence: 99%

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Zhang,

Wang,

Wang

et al. 2023

Phys. Scr.

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It is a significant challenge to construct reconfigurable electromagnetic metamaterials that can precisely manipulate broadband megahertz electromagnetic waves. Herein, we report a reconfigurable electromagnetic metamaterial (REMM) composed of a two-dimensional periodic array of spiral copper-clad unit cells, each paralleled with a micro-tunable capacitor, which has nearly linear voltage-controlled properties. Moreover, the on-board integrated sample-and-hold modules, linked to all the REMM unit cells, are activated sequentially to perform precise voltage regulation of micro-tunable capacitors for controlling the electromagnetic properties of each unit cell. The experiment results demonstrate that the REMM sample has a maximum frequency adjustment range of 2.1 MHz, ranging from 8.7 MHz to 10.9 MHz with less than 0.1 MHz adjustment step. Furthermore, in a wireless power transfer system, the proposed REMM can achieve the desirable magnetic-field manipulation by precisely adjusting the permeability distribution compared with the traditional metamaterial slab merely capable of full-negative permeability. As a result, the power transfer efficiency (PTE) can be increased from 9.53% to 11.51% (1.69% for the case without the metamaterial slab), and approximately 3.5-fold improvement (from 0.28% to 0.98%) can be achieved when coils are misaligned. This work lays the foundation for the control of electromagnetic waves through using broadband and precise reconfiguration of megahertz electromagnetic metamaterials.

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Section: Introductionmentioning

confidence: 99%

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Zhang,

Wang,

Wang

et al. 2023

Phys. Scr.

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Highly sensitive broadband terahertz modulator based on MAPbI3/Graphene/Si composite structure

Lai¹,

Wu²,

Li³

et al. 2023

Acta Phys. Sin.

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A high-performance silicon-based terahertz modulator is one of the key devices for building an ultrawideband terahertz-fiber hybrid communication system. In this paper, an ultrawideband terahertz modulator with large modulation depth based on a chalcogenide/graphene/silicon (MAPbI3/Graphene/Si) composite structure driven by near-infrared light (NIR) is proposed. The experimental results show that the graphene film and the chalcogenide hole transport layer can effectively promote the interfacial charge separation, increase the carrier complex lifetime, significantly enhance the surface conductivity of the device, further modulate the terahertz wave transmission amplitude, and realize the function of the light-controlled terahertz wave modulator under the NIR light drive. The terahertz transmission characteristics of the device are characterized by an 808 nm NIR modulation excitation source, and a large modulation depth of up to 88.3% is achieved in an ultra-wide frequency range of 0.2-2.5 THz and a low power density of 6.1 mW/mm2 driven by NIR light, which is much higher than that of the bare silicon substrate (~14.0%), with significant advantages of high sensitivity, broadband and large modulation depth. The corresponding semi-analytical device model is established and the experimental results are verified by simulation. The proposed MAPbI3/Graphene composite film is effective in enhancing the silicon-based modulator performance and provides a new strategy for the future integration of silicon-based terahertz modulators in NIR terahertz-fiber hybrid communication systems.

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Broadband and large-depth terahertz modulation by self-assembly monolayer silver nanoparticle arrays

Cited by 2 publications

References 54 publications

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Broadband and precise reconfiguration of megahertz electromagnetic metamaterials for wireless power transfer

Highly sensitive broadband terahertz modulator based on MAPbI<sub>3</sub>/Graphene/Si composite structure

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