Development of high functional plasmonic nanostructures consisting of low-cost metal species

我们研究了由Cu组成的纳米结构上产生的增强局部电场的性质，这些电场比传统的等离子体物质（Au和Ag）便宜。我们证明了有序的Cu纳米结构阵列可以通过改变产生表面等离子体共振（SPR）的波长，使其远离带间过渡区产生更长的波长，从而产生显著的消光峰。此外，我们已经证明，由于SPR产生的局部电场大大增强了卟啉衍生物和吲哚菁绿在可见光和近红外区域内的荧光信号。从这些结果中，我们证实了更便宜的等离子体纳米结构具有高的光学天线效应。

We investigated the properties of enhanced local electric fields generated on the nanostructures consisting of Cu cheaper than conventional plasmonic species (Au and Ag). We demonstrated that the an ordered array of Cu nanostructures can produce a significant extinction peak due to the excitation of surface plasmon resonance (SPR) by changing the wavelength at which it is generated to longer wavelengths away from the interband transition region. Also, we have shown that the local electric fields due to the SPR generation drastically enhanced the fluorescence signals from a porphyrin derivative and indocyanine green within visible and near infrared region above the internal transition. From these results, we confirmed that the cheaper plasmonic nanostructures have high optical antenna effects.