On March 19th, the research team of the State Key Laboratory of Transient Optics and Photonics, Institute of Optical Precision Machinery, Chinese Academy of Sciences, Fan Wenhui, the latest research results in terahertz metamaterial functional devices, with Multiple plasmonic resonance excitations on graphene metamaterials For ultrasensitive terahertz sensing, published online on Carbon, the first author of the paper is a doctoral student Chen Xu.
In this paper, a three-dimensional terahertz metamaterial structure constructed by graphene is proposed and studied. Through the interaction with terahertz waves, multiple plasmon resonance modes can be excited. The paper proposes to have multiple plasmon resonances for the first time. The model's three-dimensional metamaterial structure is applied to terahertz sensing and has high sensing sensitivity. It can realize multi-band terahertz wave ultra-sensitive active sensing and multi-band perfect absorption function, which provides a kind of terahertz sensing research. Innovative methods.
The terahertz wave mainly refers to the electromagnetic wave with the frequency between 0.1THz and 10THz. It is located between the infrared wave and the microwave. It is in the transitional region between macroscopic electronics and micro-visualism. It has many unique characteristics, such as low photon energy, strong penetrability and spectrum. Covering the molecular vibrations and rotational energy levels of organic molecules and biomacromolecules, it helps to develop new spectral analysis and non-destructive testing technologies for material property testing, microelectronic testing, medical diagnostics, environmental monitoring, chemical and biometric identification, Military and other applications.
However, it is difficult for conventional materials in nature to generate effective electromagnetic response in the terahertz frequency band. It has encountered many difficulties in developing terahertz functional devices and effective terahertz wave control, which limits the development of terahertz technology and applications, and requires new Innovative ideas address the lack of natural materials in the terahertz band.
By artificially designing micro-array arrays with sub-wavelength orders of size, artificial electromagnetic metamaterials can achieve peculiar physical properties (such as negative refractive index, super-lens, perfect absorption, etc.) that are not possessed by natural materials, and its appearance compensates for terahertz. The lack of electromagnetic materials in the frequency band can effectively control the amplitude, phase, polarization and transmission characteristics of the terahertz wave, and provides an effective way to realize the functional devices of the terahertz band. It is expected to fundamentally break through the development bottleneck of the terahertz technology. As a two-dimensional planar material arranged in a single layer of carbon atoms, graphene has excellent performance in terms of light, electricity, force, heat, etc. Its conductivity in the terahertz band can be dynamically adjusted by applying a bias voltage, thus being active. The research and development of terahertz functional devices is promising.
The electrolyte material inside the electrolytic capacitor, which has charge storage, is divided into positive and negative polarity, similar to the battery, and cannot be connected backwards.A metal substrate having an oxide film attached to a positive electrode and a negative electrode connected to an electrolyte (solid and non-solid) through a metal plate.
Nonpolar (dual polarity) electrolytic capacitor adopts double oxide film structure, similar to the two polar electrolytic capacitor after two connected to the cathode, the two electrodes of two metal plates respectively (both with oxide film), two groups of oxide film as the electrolyte in the middle.Polar electrolytic capacitors usually play the role of power filter, decoupling (like u), signal coupling, time constant setting and dc isolation in power circuit, medium frequency and low frequency circuit.Non-polar electrolytic capacitors are usually used in audio frequency divider circuit, television S correction circuit and starting circuit of single-phase motor.
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