CAJ | 학술논문

超材料是通过人工方式做成的具有特殊电磁特性的亚波长周期性金属结构，通过合理的设计样品结构，可以实现自然界中传统材料无法实现的电磁现象。超材料可以广泛用于电磁隐身、完美吸收、负折射率等研究领域，近些年，随着太赫兹技术的发展，太赫兹超材料器件被广泛研究。由于硅（S i ）对于太赫兹波的透过率较高，通常选取Si作为基底材料。但Si硬度较高、不易弯曲且易碎等缺点限制了T Hz超材料的应用。聚合物材料聚酰亚胺具有柔性，作为基底，克服了传统硅基底的缺点，透过率可以与Si匹敌，而且其表面光滑，适合传统光刻技术加工。对聚酰亚胺在太赫兹波段光学性质的测试结果表明，此种材料的折射率在1.9左右，透过率达到80％以上。设计了一种双开口谐振环结构，研究了其太赫兹波透射性质以及随太赫兹波的入射角度和样品曲率的变化规律，发现透射峰强度和峰位均不发生改变。此结果展示了将平面滤波延伸到曲面滤波领域的可能性，若将聚酰亚胺基底做薄，为今后太赫兹频段隐身衣的研究提供基础。将不同结构的两种样品叠加在一起制成宽谱滤波器，50％的带宽达到181 G Hz。此种宽带滤波器制作简单，滤波效果显著，为太赫兹波段宽带滤波器的制作提供一种新思路。
초재료시통과인공방식주성적구유특수전자특성적아파장주기성금속결구，통과합리적설계양품결구，가이실현자연계중전통재료무법실현적전자현상。초재료가이엄범용우전자은신、완미흡수、부절사솔등연구영역，근사년，수착태혁자기술적발전，태혁자초재료기건피엄범연구。유우규（S i ）대우태혁자파적투과솔교고，통상선취Si작위기저재료。단Si경도교고、불역만곡차역쇄등결점한제료T Hz초재료적응용。취합물재료취선아알구유유성，작위기저，극복료전통규기저적결점，투과솔가이여Si필활，이차기표면광활，괄합전통광각기술가공。대취선아알재태혁자파단광학성질적측시결과표명，차충재료적절사솔재1.9좌우，투과솔체도80％이상。설계료일충쌍개구해진배결구，연구료기태혁자파투사성질이급수태혁자파적입사각도화양품곡솔적변화규률，발현투사봉강도화봉위균불발생개변。차결과전시료장평면려파연신도곡면려파영역적가능성，약장취선아알기저주박，위금후태혁자빈단은신의적연구제공기출。장불동결구적량충양품첩가재일기제성관보려파기，50％적대관체도181 G Hz。차충관대려파기제작간단，려파효과현저，위태혁자파단관대려파기적제작제공일충신사로。
Metamaterials are artificial composites that acquire their electromagnetic properties from embeded subwavelength met‐alic structure .With proper design of metamaterials ,numerrous intriguing phenomena that not exhibited naturally can be real‐ized ,such as invisible cloaking ,perfect absorption ,negative refractive index and so on .In recent years ,With the development of T Hz technology ,the extensive research onT Hz metamaterials devices areattracting more and more attentions .Since silicon (Si) has a higher transmittance for THz wave ,it is usually selected as substrate in metamaterials structure .However ,Si has the shortcomings of hardness ,not easy to bend ,and fragile ,which limit the application of THz metamaterials .In this work ,we use polyimide as the substrate to overcome the shortcomings of the Si substrate .Polyimide isflexible ,smooth ,suitable for conven‐tional lithography process and the THz transmittance can compete with that of the Si .Frist ,we test the THz optical properties of polymide ,and get the refractive index of 1 .9 ,and the transmittance of 80% .Second ,we design a double splits ring resona‐tors (DSRRs) ,and study the properties of transmission by changing the T Hz incidence angle and curvature of the sample .We find the resonant amplitude and resonant frequencies are unchanged .Fabricating metamaterials structures on a thin plastic sub‐strate is a possible way to extend plane surface filtering to curved surface filtering .Third ,we try to make a broadband filter by stacking two samples ,and the 181GHz bandwidth at 50% has been achieved .By stacking several plane plastic metamaterial lay‐ers with different resonance responses into a multi‐layer structure ,a broadband THz filter can be built .The broadband filter has the advantages of simple manufacture ,obvious filtering effect ,which provides a new idea for the production of terahertz band fil‐ter .