Half-wave plate in terahertz band based on Mylar

Abstract

The invention relates to a half-wave plate in the terahertz band based on the Mylar, and belongs to the technical field of the electromagnetic wave polarization regulation. The half-wave plate is composed of a plurality of structural units in turn, wherein each structural unit adopts an electromagnetic meta-material surface, and the specific structural composition from bottom to top is: a reflective metal layer, a dielectric layer, an elongated metal structure layer. The layers are directly stacked between the layers. The resonant frequency and quality factor of the half-wave plate are respectively regulated by the length and the width of the elongated metal structure layer. Regarding the plane line polarized electromagnetic waves that are vertically incident in a frequency range, the reflected waves produce the 90-degree polarization deflection with an efficiency of more than 90%, and the overall energy loss is small, thereby achieving an ultra-high polarization deflection efficiencyin a wide frequency band range. Moreover, the half-wave plate has a simple process and a low price, and is more suitable for popularization and use. A user can make a corresponding structural wave plate as desired. In addition, the operating frequency of the wave plate can be changed by equally scaling the size of a scaled structure.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization control, and in particular relates to a Mylar-based half-wave plate in the terahertz band. Background technique [0002] Terahertz technology has gradually become a research hotspot in recent years due to its application prospects in security detection, material identification, medical imaging, and wireless broadband communication. However, due to the unique frequency range of the terahertz band, there were almost no substances with ideal electromagnetic responses to terahertz waves in the early nature, so most of the functional devices in the terahertz band, such as emission sources, detectors, polarizers, and wave plates, have been developed. It has been relatively slow. However, these functional devices are an important part of the application of terahertz technology, which hinders the development of terahertz technology, so the terahertz band has always been called "...

AI Technical Summary

Problems solved by technology

In addition, because the traditional control is realized by adjusting the propagation phase inside the medium, for different frequencies, for natural materials, it is difficult to match the difference of the refractive index and the frequency change exactly, so generally speaking, the traditional wave plate Usually single-band or narrow-band

However, for metamaterials composed of "artificial atoms", especially "metamaterial surfaces", it is easy to generate strong phase changes through resonance on a very thin spatial scale, and there is little regulation for different "crystal orientations". relevant

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