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All-semiconductor plasmonic nanoantennas for infrared sensing

机译：用于红外传感的全半导体等离子体纳米天线

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摘要

Infrared absorption spectroscopy of vibro-rotational molecular resonances provides a powerful method for investigation of a wide range of molecules and molecular compounds. However, the wavelength of light required to excite these resonances is often orders of magnitude larger than the absorption cross sections of the molecules under investigation. This mismatch makes infrared detection and identification of nanoscale volumes of material challenging. Here we demonstrate a new type of infrared plasmonic antenna for long-wavelength nanoscale enhanced sensing. The plasmonic materials utilized are epitaxially grown semiconductor engineered metals, which results in high-quality, low-loss infrared plasmonic metals with tunable optical properties. Nanoantennas are fabricated using nanosphere lithography, allowing for cost-effective and large-area fabrication of nanoscale structures. Antenna arrays are optically characterized as a function of both the antenna geometry and the optical properties of the plasmonic semiconductor metals. Thin, weakly absorbing polymer layers are deposited upon the antenna arrays, and we are able to observe very weak molecular absorption signatures when these signatures are in spectral proximity to the antenna resonance. Experimental results are supported with finite element modeling with strong agreement.
机译：振动旋转分子共振的红外吸收光谱法为研究各种分子和分子化合物提供了一种有力的方法。然而，激发这些共振所需的光的波长通常比所研究的分子的吸收截面大几个数量级。这种失配使得红外检测和鉴定纳米级材料具有挑战性。在这里，我们演示了一种用于长波长纳米级增强传感的新型红外等离子体天线。所使用的等离激元材料是外延生长的半导体工程金属，其产生具有可调光学特性的高质量，低损耗的红外等离激元金属。纳米天线是使用纳米球体光刻技术制造的，可实现具有成本效益的大面积纳米结构制造。天线阵列的光学特性取决于天线几何形状和等离子体半导体金属的光学特性。薄的，吸收性很弱的聚合物层沉积在天线阵列上，当这些信号在光谱上接近天线共振时，我们就能观察到非常弱的分子吸收信号。实验结果得到具有高度一致性的有限元建模的支持。

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