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Environmental Control of the Topological Transition in Metal/Photoemissive‐Blend Metamaterials
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-02-28 , DOI: 10.1002/adom.201701380 Vincenzo Caligiuri 1 , Raffaella Lento 2 , Loredana Ricciardi 2 , Roberto Termine 2 , Massimo La Deda 3 , Svetlana Siprova 4 , Attilio Golemme 5 , Antonio De Luca 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-02-28 , DOI: 10.1002/adom.201701380 Vincenzo Caligiuri 1 , Raffaella Lento 2 , Loredana Ricciardi 2 , Roberto Termine 2 , Massimo La Deda 3 , Svetlana Siprova 4 , Attilio Golemme 5 , Antonio De Luca 1
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The quest for unconventional optical materials finds natural answers in the field of plasmonics. Here, special composites can manifest singularities in their dielectric permittivity. The so‐called epsilon‐near‐zero (εNZ) condition is typically encountered in artificial materials called hyperbolic metamaterials (HMMs). Unfortunately, tuning the HMMs εNZ is still challenging. Here it is demonstrated how the εNZ frequency of an HMM can be reversibly tuned via thermally induced water absorption/desorption. The key element is a dielectric hygroscopic material, consisting of a blend of a polymer, a sol–gel unsintered TiO2, and an organic dye. Due to the hygroscopic nature of unsintered TiO2, an increase of temperature induces a reversible physical contraction of the thickness of the dielectric blend, as well as an increase of refractive index. This causes a remarkable 45 nm shift of the absorption peak of the embedded dye, acting as a chromatic label. When such a blend is embedded in an HMM, a reversible thermal tuning of the overall optical response, as well as an epsilon‐near‐zero wavelength shift by about 25 nm, is induced. The remarkable tuning range shown here, besides obvious HMM‐based temperature sensing applications, paves the way toward a plethora of new functions in which tunable εNZ materials are needed.
中文翻译：
金属/光发射混合超材料的拓扑转变的环境控制
对非常规光学材料的追求在等离激元学领域找到了自然答案。在这里，特殊的复合材料的介电常数可以表现出奇异性。所谓的ε接近零（εNZ）条件通常在称为双曲线超材料（HMM）的人造材料中遇到。不幸的是，调整HMM模型ε NZ仍然具有挑战性。在此说明如何通过热诱导的吸水/解吸来可逆地调整HMM的εNZ频率。关键元素是介电吸湿材料，它由聚合物，溶胶-凝胶未烧结TiO 2和有机染料的混合物组成。由于未烧结的TiO 2的吸湿性温度升高引起介电混合物厚度的可逆物理收缩，以及折射率增加。这会导致嵌入的染料的吸收峰发生明显的45 nm位移，从而成为彩色标记。当将此类共混物嵌入HMM中时，会引起整体光学响应的可逆热调谐，以及约25 nm的近零波长的ε位移。除了基于HMM的温度感测应用之外，此处显示的出色调节范围还为实现大量新功能铺平了道路，在这些新功能中，需要可调节的NZ材料。
更新日期：2018-02-28
中文翻译：
金属/光发射混合超材料的拓扑转变的环境控制
对非常规光学材料的追求在等离激元学领域找到了自然答案。在这里，特殊的复合材料的介电常数可以表现出奇异性。所谓的ε接近零（εNZ）条件通常在称为双曲线超材料（HMM）的人造材料中遇到。不幸的是，调整HMM模型ε NZ仍然具有挑战性。在此说明如何通过热诱导的吸水/解吸来可逆地调整HMM的εNZ频率。关键元素是介电吸湿材料，它由聚合物，溶胶-凝胶未烧结TiO 2和有机染料的混合物组成。由于未烧结的TiO 2的吸湿性温度升高引起介电混合物厚度的可逆物理收缩，以及折射率增加。这会导致嵌入的染料的吸收峰发生明显的45 nm位移，从而成为彩色标记。当将此类共混物嵌入HMM中时，会引起整体光学响应的可逆热调谐，以及约25 nm的近零波长的ε位移。除了基于HMM的温度感测应用之外，此处显示的出色调节范围还为实现大量新功能铺平了道路，在这些新功能中，需要可调节的NZ材料。
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