Narrow and wide band tunable absorbers based on gold squares dispersed in liquid crystal
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In this paper, the absorption behavior of gold squares with different sizes has been investigated. Our study includes gold squares in two, three and four different sizes dispersed in liquid crystal to propose an absorber with post fabrication tunability. In this case, more than 95% narrow band as well as wide band absorptions have been obtained when two and three sizes of gold squares have been used. Moreover, wide band absorption spectrum with the full width at half maximum of about 0.31 µm has been obtained when there are four different sizes of gold squares in our structure. Also, graphene has been utilized to boost the narrow band absorption from about 80 to 95%.
KeywordsAbsorber Liquid crystal Localized surface plasmon resonance (LSPR) Graphene
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