Percolating plasmonic networks for light emission control
Percolating plasmonic networks for light emission control
复制标题
DOI：
10.1039/c4fd00187g
复制
发表时间：
2015-01-01
影响因子：
3.4
通讯作者：
Sapienza, Riccardo
中科院分区：
文献类型：
--
作者：
Gaio, Michele;Castro-Lopez, Marta;Sapienza, Riccardo
光学纳米天线彻底改变了我们在纳米结构光子环境中操纵单个光源发射的单个光子的方式。复杂的等离子体结构允许通过缩短或拉伸固定工作频率的光波长来进行多尺度光控制，从而满足发射器的尺寸和传播模式的尺寸。在这里，我们研究自组装半连续的金膜和光刻金网络，其特征在于大的局部光态密度（LDOS）波动周围的电渗流阈值，一个政权的表面的特点是大的金属簇与分形拓扑结构。我们研究了等离子体网络的形成及其对嵌入式荧光探针在这些系统中的光发射的影响。通过荧光动力学实验，我们讨论了全球长程相互作用的渗透程度和网络分形的作用，以及来自当地的电磁场和拓扑结构的本地近场的贡献。我们的实验表明，本地属性占主导地位的荧光修改。
Optical nanoantennas have revolutionised the way we manipulate single photons emitted by individual light sources in a nanostructured photonic environment. Complex plasmonic architectures allow for multiscale light control by shortening or stretching the light wavelength for a fixed operating frequency, meeting the size of the emitter and that of propagating modes. Here, we study self-assembled semi-continuous gold films and lithographic gold networks characterised by large local density of optical state (LDOS) fluctuations around the electrical percolation threshold, a regime where the surface is characterised by large metal clusters with fractal topology. We study the formation of plasmonic networks and their effect on light emission from embedded fluorescent probes in these systems. Through fluorescence dynamics experiments we discuss the role of global long-range interactions linked to the degree of percolation and to the network fractality, as well as the local near-field contributions coming from the local electro-magnetic fields and the topology. Our experiments indicate that local properties dominate the fluorescence modification.