Efficient terahertz polarization beam splitter based on waveguide transmission

Abstract

A terahertz polarization beam splitter comprises a periodic metal-medium-metal waveguide layer, wherein the periodic metal-medium-metal waveguide layer is composed of metal strips and medium strips which are alternately arranged, and a plurality of waveguide layers with different medium widths are included in one period. The terahertz polarization beam splitter can perform beam splitting on incident TE mode polarized waves and TM mode polarized waves. A polarization beam splitting function is realized by utilizing different dependence of TE and TM waveguide modes on the dielectric width, and the TE and TM waveguide modes have the advantage of low loss in the metal waveguide and high efficiency. For terahertz waves of different frequency bands, the terahertz polarization beam splitter can realize the polarization beam splitting effect by adjusting the waveguide medium width and the waveguide transmission length.

Description

technical field [0001] The invention relates to the field of terahertz devices, in particular to a high-efficiency terahertz polarization beam splitter based on waveguide transmission. Background technique [0002] At present, terahertz technology has become one of the most important subjects in this century. It has unique advantages and great application prospects in important fields such as imaging, communication, astronomy, and medical treatment. In addition to terahertz sources and detectors in terahertz systems, functional devices such as terahertz modulators, filters, beam splitters, and polarizers are also essential. Among these devices, polarization beam splitters play a very important role in terahertz polarization spectroscopy, polarization imaging, and polarization state communication. In the terahertz range, due to the low power, the transmission efficiency of the device is particularly important, coupled with the free space path loss and atmospheric absorption,...

AI Technical Summary

Problems solved by technology

However, these natural optical crystals are not only rare, but also have weak birefringence and low transmission efficiency, requiring thicker materials

[0003] Traditional metal metasurfaces have surface plasmon resonance, but the plasmon frequencies of metals are generally in the visible and ultraviolet bands, and metals are close to ideal conductors in the THz band, so it is difficult to excite surface plasmon resonance, and most metals Metasurfaces are reflective metasurfaces, which require the design of complex optical paths, which are difficult to meet the application of most transmission situations.

With the trend of increasing integration of optical systems today, traditional polarization beam splitters can no longer meet the application requirements

Images