CAS OpenIR  > 中科院上海应用物理研究所2011-2020年
Ultra-Broadband THz Antireflective Coating with Polymer Composites
Cai, B; Chen, HT; Xu, GJ; Zhao, HW; Sugihara, O
Source PublicationPOLYMERS
AbstractAchieving an ultra-broadband range is an essential development direction in terahertz techniques; however, a method to cover the full terahertz band by using a highly efficient antireflection (AR) coating that could greatly increase the efficiency of terahertz radiation is still lacking. It is known that structures possessing a graded-index profile can offer a broadband AR effect, and such structures have been widely used, especially in the visible range. In this paper, first, we tuned the refractive index of a cyclo-olefin polymer (COP) by using a TiO2 dopant, and a polymer-TiO2 composite with a refractive index of 3.1 was achieved. We then fabricated a surface-relief structure with a graded-index profile by using a hot-embossing method. The structure on the silicon substrate can provide an excellent AR effect, but the working band is still limited by its scale of sag and swell. To obtain an ultra-broadband AR effect, we then proposed a flat six-layer structure; a graded-index profile was obtained by casting epoxy-TiO2 composites in the order of a high index to lower indices. With a very well controlled refractive index and thickness of each layer, we achieved an AR effect of <2% in the ultra-broadband of 0.2-20 THz.
KeywordTerahertz Frequency-range High Refractive-index Fabrication Technology
Indexed BySCI
WOS IDWOS:000416807600027
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Document Type期刊论文
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GB/T 7714
Cai, B,Chen, HT,Xu, GJ,et al. Ultra-Broadband THz Antireflective Coating with Polymer Composites[J]. POLYMERS,2017,9(11):-.
APA Cai, B,Chen, HT,Xu, GJ,Zhao, HW,&Sugihara, O.(2017).Ultra-Broadband THz Antireflective Coating with Polymer Composites.POLYMERS,9(11),-.
MLA Cai, B,et al."Ultra-Broadband THz Antireflective Coating with Polymer Composites".POLYMERS 9.11(2017):-.
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