CAJ | 학술논문

太赫兹纤维波导是太赫兹系统中重要的组成元件.为了实现太赫兹辐射的低损耗低色散传输,设计了一种以环烯烃共聚物为基质的多孔太赫兹纤维,并利用基全矢量有限元法的商业软件COMSOL分析了该多孔太赫兹纤维的传输特性,着重考察了亚波长多孔纤芯的结构参数对传输特性的影响.结果表明,这种太赫兹纤维可以将模场能量很好地限制在亚波长多孔纤芯中传输,具有较小的有效模场面积、低的传输损耗和平坦近零色散等优良的传输特性;同时,通过增大多孔纤芯的占空比,可以将更多的模场能量限制在亚波长直径的空气孔洞中传输,并减小太赫兹纤维的有效模场面积和有效模式损耗,但同时会增大限制损耗和色散.
태혁자섬유파도시태혁자계통중중요적조성원건.위료실현태혁자복사적저손모저색산전수,설계료일충이배희경공취물위기질적다공태혁자섬유,병이용기전시량유한원법적상업연건COMSOL분석료해다공태혁자섬유적전수특성,착중고찰료아파장다공섬심적결구삼수대전수특성적영향.결과표명,저충태혁자섬유가이장모장능량흔호지한제재아파장다공섬심중전수,구유교소적유효모장면적、저적전수손모화평탄근령색산등우량적전수특성;동시,통과증대다공섬심적점공비,가이장경다적모장능량한제재아파장직경적공기공동중전수,병감소태혁자섬유적유효모장면적화유효모식손모,단동시회증대한제손모화색산.
Terahertz fiber is one of the essential components in the terahertz system. In order to realize minimum low loss and dispersion of terahertz transmittion, a novel hollow terahertz fiber was designed and optimizated, which was based on Topas COC. Using the commercial software COMSOL based on the full-vector finite element method, the transmitting characters of this hollow terahertz fiber were calculated and the effects of the structural parameters on transmitting THz wave in the porous fiber core were analyzed. The research shows that adopting designed porous structure can confine the mode energy in porous core, and obtain small mode area, low propagation loss and nearly zero ultra-flattened dispersion. Increasing rate of the hole diameter to the hole spacing, the more mode energy can be confined in the porous fiber core, and the effective mode area and effective mode loss were reduced, but the confine loss and dispersion would be enlarged simultaneously.