摘要
基于介质/金属膜结构空芯波导的原理,制作了用于太赫兹波传输的大口径柔性介质/金属膜波导。针对大口径的特点,设计改良了液相镀膜法并制作了具有不同介质膜厚的柔韧波导。对制作波导的介质膜厚和损耗谱等进行了理论分析和实验验证。采用发射频率为2.5 THz的量子级联激光器,对介质/金属膜结构太赫兹空芯波导的传输损耗、弯曲附加损耗以及光斑能量分布特性等进行了实验研究。结果表明,传输损耗及弯曲附加损耗均随介质膜厚的增加而减小,光斑能量则随介质膜厚的增加更加集中于低阶传输模式。
Big-bore and flexible waveguides are fabricated for Terahertz wave transmission based on the structure of dielectric-coated metallic hollow waveguides.The liquid-phase coating technique for the dielectric film inner- coating is modified and improved for the large-bore waveguides. The dielectric film thickness and the loss spectrum are the oretically and experimentally discussed. The experimental system is established to evaluate the transmission loss, additional bending attenuation, and output beam profile of the Terahertz （THz） waveguides at the frequency of 2.5 THz. According to the measured results, the transmission loss and additional bending attenuation are both decreased as the dielectric film thickness increases in the THz waveguides, while the energy distribution of beam profiles tends to focus on lower transmission modes.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2016年第1期48-56,共9页
Acta Optica Sinica
基金
国家自然科学基金(61201062)
关键词
光纤光学
空芯波导
太赫兹
大口径柔性波导
fiber optics
hollow waveguide
terahertz
big-bore flexible waveguide
