Research On Terahertz Spoof Surface Plasmon Polaritons Bending Waveguides And Devices

The terahertz surface plasmon polaritons curved waveguide holds a central position in on-chip terahertz systems,as it enables reduction in size and compactness of terahertz devices and systems,as well as facilitating on-chip transmission of terahertz signals and multifunctional integration.The current research aims to advance the development of more complex multifunctional on-chip devices,by designing an adjustable broadband filter operating on the racetrack microring resonator,built upon the novel curved waveguide technology proposed in this thesis.The main contributions and innovations of this research work can be summarized as:Firstly,A 90° terahertz bending waveguide with a significantly enlarged working bandwidth and minimal loss has been developed through the implementation of a domino structure with periodic repetition.The main waveguide incorporates a narrow auxiliary waveguide with an extensive height discrepancy positioned parallel to its outer surface.The resulting air space that exists between the two waveguides significantly reduces bending loss and heightens working bandwidth.Additionally,the attenuation constant has been introduced to elucidate the underlying design methodology.The proposed design has been demonstrated to effectively minimize the bending loss without increasing the bending radius of the waveguide.This characteristic has allowed for the miniaturization of the device.Moreover,when compared to standard curved waveguides,the introduced design has exhibited an approximate doubling in working bandwidth.Such an outcome effectively enhances the converging resources of spectrum transmission brought forth by curved waveguides.Secondly,this article presents a design of a tunable filter constructed on racetrack microring,utilizing low loss curved waveguides.The device significantly minimizes the bending loss of the racetrack microring by including an addition auxiliary waveguide on its curved section,while maintaining a smaller bending radius.Additionally,the metal column of the racetrack microring direct waveguide is capable of rotating by an identical Angle E in the coupling region,effectively altering the cumulative phase and thereby tuning the working state of the microring resonator.By leveraging these structural modifications,the developed architecture offers a highly functional filtering capability,setting it apart from similar devices within the domain.