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Shaanxi Xi'an Institute of Optics and Acquires Advances in Terahertz Metamaterial Functional Devices
China Instrument Network Instrument R&D On March 19th, the Fan Wenhui Research Group of the State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, made the latest research achievements in the terahertz metamaterial functional device. Multiple plasmonic resonance excitations on graphene metamaterials for ultrasensitive terahertz sensing were published online on Carbon. The first author of the paper was Dr. Chen Xu.
A three-dimensional terahertz metamaterial structure constructed using graphene is proposed and studied in this thesis. Through the interaction with the terahertz wave, multiple plasmon resonance modes can be excited. This paper proposes for the first time that this has multiple plasmon resonances. The model's three-dimensional metamaterial structure is applied to terahertz sensing, has a high sensitivity of sensing, can realize multi-band terahertz ultra-sensitive active sensing and multi-band perfect absorption, and provides a kind of terahertz sensing research. Innovative methods.
Terahertz waves mainly refer to electromagnetic waves with frequencies between 0.1 THz and 10 THz. They are located between infrared waves and microwaves. They are in the transition area between macroelectronics and microscopic studies. They have many unique characteristics, such as low photon energy, high penetration, and spectrum. Covering the molecular vibrations and rotational energy levels of organic molecules and biological macromolecules is conducive to the development of new spectral analysis and non-destructive testing technologies for material property detection, microelectronics testing, medical diagnostics, environmental monitoring, chemical and biometric identification, Applications such as military defense.
However, it is difficult for conventional materials in nature to generate effective electromagnetic responses in the terahertz band, and many difficulties are encountered in the development of terahertz functional devices and effective control of terahertz waves, which limits the development of terahertz technologies and applications and requires new ones. Innovative ideas to deal with the lack of natural materials in the terahertz band.
By artificially designing micro-arrays with sub-wavelength magnitudes for element sizes, artificial electromagnetic metamaterials can achieve exotic physical properties (such as negative refractive index, hyper-lenses, perfect absorption, etc.) that natural materials do not possess, and its appearance makes up for terahertz. The lack of electromagnetic material in the frequency band can effectively control the amplitude, phase, polarization, and transmission characteristics of the terahertz wave, providing an effective way to implement the terahertz frequency band functional device, and is expected to fundamentally break through the development bottleneck of the terahertz technology. As a two-dimensional planar material in which single layers of carbon atoms are arranged, graphene has excellent performance in terms of light, electricity, force, heat, etc., and its conductivity in the terahertz frequency band can be dynamically adjusted by an external bias voltage, and thus is active. Terahertz functional devices have great prospects for research and development.
(Original title: Xi'an Institute of Optics and Technology, progresses in research on terahertz metamaterial functional devices)