研究目的
Designing and fabricating single-mode dielectric waveguides for 140 GHz using 3D printing technology and characterizing their frequency-dependent attenuation constant and effective refractive index from 100 GHz to 180 GHz.
研究成果
The 3D printed dielectric waveguides exhibit an attenuation constant increasing from 3.4 m?1 to 5.2 m?1 and an effective refractive index increasing from 1.44 to 1.625 at frequencies from 100 GHz to 140 GHz. Future work aims to design and characterize other THz devices based on these waveguides.
研究不足
The coupling between the waveguide and the emitter is optimized around 140 GHz, leading to poor alignment and erroneous evaluation at higher frequencies. The waveguide-detector coupling is also affected by changes in mode patterns at frequencies above 140 GHz.
1：Experimental Design and Method Selection:
The waveguides are simulated using the finite difference time-domain (FDTD) method and characterized using THz frequency-domain spectroscopy (THz-FDS).
2：Sample Selection and Data Sources:
High impact polystyrene (HIPS) is chosen for the waveguide core due to its low attenuation at THz frequencies.
3：List of Experimental Equipment and Materials:
THz-FDS system TeraScan1550 from TOPTICA Photonics, 3D printed waveguides, and HIPS material.
4：Experimental Procedures and Operational Workflow:
Waveguides are designed with a square cross-section for single-mode operation at 140 GHz, and their performance is evaluated through transmission measurements and transversal scans of the far-field radiation pattern.
5：Data Analysis Methods:
The attenuation constant and effective refractive index are determined from the measured photocurrent and group delays, respectively.
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