Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide.
Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide.
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DOI：
10.1038/lsa.2016.173
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发表时间：
2016-10
期刊：
影响因子：
--
通讯作者：
Aizpurua J
中科院分区：
文献类型：
--
作者：
Muskens OL;Bergamini L;Wang Y;Gaskell JM;Zabala N;de Groot CH;Sheel DW;Aizpurua J
纳米器件与光的相互作用可以通过外部控制信号来配置，这对下一代光电电路具有很大的兴趣。表现出结构或电子相变的材料提供了与多级光开关和存储功能相比的大调制。此外，等离子体纳米天线可以提供一种有效的机制来增强材料在局部环境中的光诱导激发和读出。在这里，我们展示了在等离子体天线-二氧化钒（VO2）杂化体中，利用强谐振场增强和等离子体热点的选择性光泵浦，实现了局域相变的皮秒全光开关。多频交叉天线阵列的极化和波长依赖泵浦探测光谱表明，等离子体热点的纳米级光开关不会影响距离激发天线100 nm内的邻近天线。在皮秒时间尺度上，通过天线介导的局部加热谐振的数值模型计算，证实了天线辅助泵送机理。与没有天线的VO2薄膜相比，这种混合的纳米级激发机制使开关能量降低了20倍，恢复时间提高了5倍，实现了每秒超过200万次的完全可逆开关，局部开关能量在皮焦耳范围内。天线和VO2的混合解决方案提供了一个概念框架，以合并场定位和相变响应，实现精确的纳米级光存储功能。
Nanoscale devices in which the interaction with light can be configured using external control signals hold great interest for next-generation optoelectronic circuits. Materials exhibiting a structural or electronic phase transition offer a large modulation contrast with multi-level optical switching and memory functionalities. In addition, plasmonic nanoantennas can provide an efficient enhancement mechanism for both the optically induced excitation and the readout of materials strategically positioned in their local environment. Here, we demonstrate picosecond all-optical switching of the local phase transition in plasmonic antenna-vanadium dioxide (VO2) hybrids, exploiting strong resonant field enhancement and selective optical pumping in plasmonic hotspots. Polarization- and wavelength-dependent pump–probe spectroscopy of multifrequency crossed antenna arrays shows that nanoscale optical switching in plasmonic hotspots does not affect neighboring antennas placed within 100 nm of the excited antennas. The antenna-assisted pumping mechanism is confirmed by numerical model calculations of the resonant, antenna-mediated local heating on a picosecond time scale. The hybrid, nanoscale excitation mechanism results in 20 times reduced switching energies and 5 times faster recovery times than a VO2 film without antennas, enabling fully reversible switching at over two million cycles per second and at local switching energies in the picojoule range. The hybrid solution of antennas and VO2 provides a conceptual framework to merge the field localization and phase-transition response, enabling precise, nanoscale optical memory functionalities.
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