Doped polymer for low-loss dielectric material in the terahertz range
Doped polymer for low-loss dielectric material in the terahertz range
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DOI：
10.1364/ome.5.001373
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发表时间：
2015-06-01
影响因子：
2.8
通讯作者：
Sriram, Sharath
中科院分区：
文献类型：
--
作者：
Headland, Daniel;Thurgood, Peter;Sriram, Sharath
利用掺杂剂对弹性聚合物的介电性能进行了改性，目的是降低太赫兹范围内的介电损耗。以聚二甲基硅氧烷(PDMS)为主体聚合物，以氧化铝或聚四氟乙烯(PTFE)微纳微粉为掺杂剂。制备了复合材料样品，并用太赫兹时域光谱(THz-TDS)对其进行了表征。样品的介电损耗显著降低，对于聚四氟乙烯质量分数为40%的样品，损耗正切最大可降低15.3%。计算结果与Lichtenecker对数混合公式有较好的一致性，任何偏差都可以用掺杂微米/纳米颗粒的团聚来解释。这种新型介电复合材料有望设计出太赫兹频率下的高效微结构元件。(C)2015年美国光学学会
The dielectric properties of an elastomeric polymer are modified with the inclusion of dopants, with the aim of reducing dielectric loss in the terahertz range. Polydimethylsiloxane (PDMS) is selected as the host polymer, and micro/nano-particle powders of either alumina or polytetrafluoroethylene (PTFE) are employed as dopants. Composite samples are prepared, and characterised with terahertz time-domain spectroscopy (THz-TDS). The samples exhibit significantly reduced dielectric loss, with a maximum reduction of 15.3% in loss tangent reported for a sample that is 40% PTFE by mass. Results are found to have reasonable agreement with the Lichtenecker logarithmic mixture formula, and any deviation can be accounted for by agglomeration of dopant micro/nano-particles. The new dielectric composites are promising for devising efficient micro-structure components at terahertz frequencies. (C) 2015 Optical Society of America