SEPnet and the Department of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.
Nano Lett. 2011 Jun 8;11(6):2457-63. doi: 10.1021/nl200901w. Epub 2011 May 4.
We demonstrate experimentally picosecond all-optical control of a single plasmonic nanoantenna embedded in indium tin oxide (ITO). We identify a picosecond response of the antenna-ITO hybrid system, which is distinctly different from transient bleaching observed for gold antennas on a nonconducting SiO(2) substrate. Our experimental results can be explained by the large free-carrier nonlinearity of ITO, which is enhanced by plasmon-induced hot-electron injection from the gold nanoantenna into the conductive oxide. The combination of tunable antenna-ITO hybrids with nanoscale plasmonic energy transfer mechanisms, as demonstrated here, opens a path for new ultrafast devices to produce nanoplasmonic switching and control.
我们通过实验证明了嵌入在氧化铟锡（ITO）中的单个等离子体纳米天线的皮秒级全光学控制。我们确定了天线-ITO 混合系统的皮秒响应，这与在非导电 SiO2 衬底上的金天线观察到的瞬态漂白明显不同。我们的实验结果可以通过 ITO 的大自由载流子非线性来解释，这种非线性通过等离子体诱导的热电子从金纳米天线注入到导电氧化物而增强。如这里所示，可调谐的天线-ITO 混合体与纳米级等离子体能量转移机制的结合，为产生纳米等离子体开关和控制的新型超快器件开辟了道路。
