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- 摘要
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- 实验方案
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Proposal for a symmetrical petal core terahertz waveguide for terahertz wave guidance
摘要： Countering the terahertz wave applications ‘inefficient transmission’ calls for rapid development in terahertz waveguides that could simultaneously minimize confinement loss, chromatic dispersion and maximize the fraction of power. Here, a new kind of symmetrical petal hollow core terahertz waveguide based on cyclic olefin homopolymer is proposed to achieve low confinement loss, low chromatic dispersion and a high fraction of power. In this designed waveguide, a symmetrical petal-shaped air hole is treated as the core and circular air holes arranged as sunflower-type are inserted in the cladding. The guiding characteristics of the designed waveguide are simulated and analyzed based on the finite element method with perfectly matched layer boundary condition. Based on the optimum structure parameters, it exhibits a minimum confinement loss of 0.0089 dB/cm at 2.58 THz and a < 0.07 dB/cm bandwidth spanning across 2.51 - 2.71 THz. Furthermore, in the same frequency region, the high core power fraction is above 93%, and the group velocity dispersion values are lower than 0.6 ps/THz/cm.
关键词： petal hollow core,terahertz waveguide,efficient transmission
更新于2025-09-23 15:21:01
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Design of Suspended Sub-wavelength Terahertz Waveguide Connector
摘要： The design of a sub-wavelength terahertz waveguide in presented. The high transmission efficiency of the waveguide and the components are demonstrated by using finite element method and beam propagation method. the good coupling between
关键词： Absorption Loss,Splicing Loss,Subw-avelength terahertz Waveguide
更新于2025-09-16 10:30:52
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0.1THz super-resolution imaging based on 3D printed confocal waveguides
摘要： The paper reports a waveguide-based lens-free terahertz (THz) imaging method. It not only inherits the advantages of traditional confocal imaging, but also realizes super-resolution in THz band. The waveguides prepared by a 3D printing and metal-cladding technology can replace the traditional lens to transmit and focus THz wave effectively. For verification, two hollow waveguides (8 mm inner diameter, 60 mm length) were fabricated and a 0.1 THz confocal waveguides imaging system was built. High quality THz images with a minimum resolution of 1.41 mm (less than 1/2 of the wavelength) were obtained by placing the imaging targets at the waveguide’s focus and performing two-dimensional scanning. The focusing mechanism and transmission characteristics of THz in the waveguide are simulated and analyzed. The simulations are in agreement with the experiments.
关键词： terahertz waveguide,3D printed,confocal system,Super-resolution imaging
更新于2025-09-12 10:27:22
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Extremely low loss optical waveguide for terahertz pulse guidance
摘要： This study proposed a dielectric terahertz (THz) D-shape core based photonic crystal fiber (PCF) with very low level of effective material loss (EML) for efficient THz pulse propagation. The modal parameters of the proposed fiber have been rigorously computed using finite element method (FEM) by considering the absorption boundary condition (ABC) using perfectly matched layer (PML). Investigation results of the fiber exhibit a low material absorption loss of 0.027 cm-1 and zero flatted dispersion within the 0.85–1.25 THz range. Additionally, large number of crucial features of the fiber have been evaluated. It reduces the bulk absorption loss of ~87% at the same time offers single mode operation. The proposed fiber can be easily fabricated by using stack and draw or sol-gel technique. Due to excellent optical guiding properties, it can be a potential prospect in THz sensing, communication and imaging applications.
关键词： Low effective material loss,Zero flatted dispersion,D shape PCF,Bulk absorption loss,Terahertz waveguide
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - Silicon-Micromachined Waveguide Calibration Shims for Terahertz Frequencies
摘要： A new method of realising precision waveguide shims for use in THz Through-Re?ect-Line (TRL) calibrations, based on silicon-micromachining, is introduced. The proposed calibration shims combine a thin λ/4 silicon layer, co-fabricated with a thicker layer which provides mechanical support. This design overcomes the limitations of CNC milling for the creation of calibration shims, facilitating use of standard TRL calibration at currently challenging frequencies. The novel shim ?ts inside the inner recess of a standard waveguide ?ange and is compatible with conventional ?ange alignment pins. Five micromachined shims were fabricated in a silicon-on-insulator process for operation in the WM-570 waveguide band (325 – 500 GHz). The fabricated shims show excellent performance across the entire band, with return loss in excess of 25 dB, insertion loss below 0.2 dB and high uniformity between samples. Veri?cation reveals that the micromachined shims have an electrical length within 2% of the expected value. Comparative measurements of a DUT calibrated with the proposed shim and a previously un-used conventional metallic shim show that the novel concept offers equivalent, if not better, performance. The mechanical design of the micromachined shim and the rigid nature of silicon ensure that it will not suffer from performance degradation with repeated use, as is problematic with thin metallic shims. This work enables the creation of low-cost, highly-repeatable, trace- able calibration shims with micrometer feature-sizes and high product uniformity, surpassing the limits of current techniques.
关键词： calibration,micromachining,TRL,terahertz,waveguide,THz
更新于2025-09-11 14:15:04
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Design and numerical analysis of highly birefringent single mode fiber in THz regime
摘要： A novel kind of porous core microstructure optical fiber is proposed in this paper. In order to create flexibility of the fiber only ring air hole is used for the cladding region. Finite Element Method (FEM) based Comsol v4.2 software is used to investigate the guiding characteristics of the proposed fiber. The optimum design parameter shows an ultrahigh birefringence of 0.051, low effective material loss of 0.07 cm?1 and low bending loss of 1.13 × 10?13 dB/cm at 1.2 THz. Moreover, the proposed fiber offers very low dispersion of 1.2 ± 0.32 ps/THz/cm over a wide range of frequency from 1.1 THz to 1.9 THz. Other important guiding characteristics such as confinement loss, effective area and single mode propagation are also discussed in detail. This structure may be a good choice in different remarkable terahertz applications.
关键词： Dispersion,Birefringence,Terahertz waveguide,Effective material loss
更新于2025-09-04 15:30:14