标题： 纳米多孔金叶片：可见光和中红外光谱区域的等离激元行为 显示英文标题

标题： Nanoporous gold leaves: plasmonic behavior in the visible and mid-infrared spectral regions

摘要： 一种稳健且可重复制备自支撑纳米多孔金叶片（NPGL）的方法被提出，并进行了光学表征和等离激元行为分析。纳米多孔金（NPG）层通常在块体基底上制备为薄膜。在这里，我们提出了一种替代方法，即以自支撑薄膜的形式制备NPGL。这种解决方案实现了完美的对称配置，其中金属浸没在均匀介质中，并且还可以支持对称和反对称等离激元模式的传播。与块体金相比，NPG在更高波长下表现出金属行为，表明其可能在近/中红外范围有等离激元应用。在本工作中，研究了从紫外到中红外范围的宽波长范围内的等离激元特性。 显示英文摘要

摘要： A robust and reproducible preparation of self-standing nanoporous gold leaves (NPGL) is presented, with optical characterization and plasmonic behaviour analysis. Nanoporous gold (NPG) layers are tipically prepared as thin films on a bulk substrate. Here we present an alternative approach consisting in the preparation of NPGL in the form of a self-standing film. This solution leads to a perfectly symmetric configuration where the metal is immersed in a homogeneous medium and in addition can support the propagation of symmetric and antisymmetric plasmonic modes. With respect to bulk gold, NPG shows metallic behaviour at higher wavelengths, suggesting possible plasmonic applications in the near / medium infrared range. In this work the plasmonic properties in the wide wavelength range from the ultraviolet up to the mid-infrared range have been investigated.