Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers
Broadband polarization-independent resonant light absorption using ultrathin plasmonic super absorbers
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DOI：
10.1038/ncomms1528
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发表时间：
2011-11-01
影响因子：
16.6
通讯作者：
Atwater, Harry A.
中科院分区：
文献类型：
--
作者：
Aydin, Koray;Ferry, Vivian E.;Atwater, Harry A.
共振等离子体和超材料结构允许在纳米尺度上控制基本的光学过程，如吸收、发射和折射。最近大量的研究集中在能量吸收过程上，等离子体纳米结构已经被证明可以提高光伏电池和热光伏电池的性能。虽然减少金属损耗是纳米光子学广泛追求的目标，但仅由无损介电材料和高反射贵金属组成的纳米结构“黑色”超级吸收体的设计代表了一个新的研究方向。在这里，我们展示了一种超薄（260纳米）等离子体超级吸收体，由金属-绝缘体-金属堆叠和由交叉梯形阵列组成的纳米结构顶部银膜组成。我们的超级吸收剂在整个可见光谱（400-700 nm）上产生宽带和不依赖偏振的共振光吸收，平均测量吸收为0.71，模拟吸收为0.85。所提出的纳米结构吸收剂为实现基于共振吸收的超薄黑色超材料开辟了道路。
Resonant plasmonic and metamaterial structures allow for control of fundamental optical processes such as absorption, emission and refraction at the nanoscale. Considerable recent research has focused on energy absorption processes, and plasmonic nanostructures have been shown to enhance the performance of photovoltaic and thermophotovoltaic cells. Although reducing metallic losses is a widely sought goal in nanophotonics, the design of nanostructured 'black' super absorbers from materials comprising only lossless dielectric materials and highly reflective noble metals represents a new research direction. Here we demonstrate an ultrathin (260 nm) plasmonic super absorber consisting of a metal-insulator-metal stack with a nanostructured top silver film composed of crossed trapezoidal arrays. Our super absorber yields broadband and polarization-independent resonant light absorption over the entire visible spectrum (400-700 nm) with an average measured absorption of 0.71 and simulated absorption of 0.85. Proposed nanostructured absorbers open a path to realize ultrathin black metamaterials based on resonant absorption.