Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas.
Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas.
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DOI：
10.1038/lsa.2016.13
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发表时间：
2016-01
期刊：
影响因子：
--
通讯作者：
Linden S
中科院分区：
文献类型：
--
作者：
Linnenbank H;Grynko Y;Förstner J;Linden S
等离子体纳米天线提供了前所未有的机会，将光场集中在亚波长大小的体积中。通过将非线性介电纳米颗粒放置在这样的热点中，人们可以希望利用纳米天线提供的场增强和介电纳米颗粒的大的非线性光学极化率。为了测试这一概念，我们结合联合收割机金间隙纳米天线与二阶，非线性硫化锌纳米粒子，并进行二次谐波产生（SHG）光谱的组合混合电介质/等离子体纳米天线以及对个别成分。我们发现，从裸金纳米天线的SHG，即使它应该被禁止，由于对称性的原因，是几个数量级大于裸硫化锌纳米粒子。甚至更强的二次谐波信号由混合电介质/等离子体纳米天线产生。含有线性氟化镧纳米颗粒的纳米天线的对照实验揭示，然而，混合电介质/等离子体纳米天线的增加的SHG效率不依赖于电介质纳米颗粒的非线性光学极化率，而是电介质环境的改性的效果。仅对入射泵浦光场谐振的混合电介质/等离子体纳米天线与对所生成的二次谐波光谐振的第二纳米天线的组合允许进一步提高SHG的效率。由于第二纳米天线介导二次谐波光到远场的耦合，因此这种双谐振方法还为我们提供了对所产生光的偏振的控制。
Plasmonic nanoantennas provide unprecedented opportunities to concentrate light fields in subwavelength-sized volumes. By placing a nonlinear dielectric nanoparticle in such a hot spot, one can hope to take advantage of both the field enhancement provided by nanoantennas and the large, nonlinear optical susceptibility of dielectric nanoparticles. To test this concept, we combine gold gap nanoantennas with second-order, nonlinear zinc sulfide nanoparticles, and perform second harmonic generation (SHG) spectroscopy on the combined hybrid dielectric/plasmonic nanoantennas as well as on the individual constituents. We find that SHG from the bare gold nanoantennas, even though it should be forbidden due to symmetry reasons, is several orders of magnitude larger than that of the bare zinc sulfide nanoparticles. Even stronger second harmonic signals are generated by the hybrid dielectric/plasmonic nanoantennas. Control experiments with nanoantennas containing linear lanthanum fluoride nanoparticles reveal; however, that the increased SHG efficiency of the hybrid dielectric/plasmonic nanoantennas does not depend on the nonlinear optical susceptibility of the dielectric nanoparticles but is an effect of the modification of the dielectric environment. The combination of a hybrid dielectric/plasmonic nanoantenna, which is only resonant for the incoming pump light field, with a second nanoantenna, which is resonant for the generated second harmonic light, allows for a further increase in the efficiency of SHG. As the second nanoantenna mediates the coupling of the second harmonic light to the far field, this double-resonant approach also provides us with control over the polarization of the generated light.
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影响因子：
10.8
作者：
Grinblat, Gustavo;Rahmani, Mohsen;Bragas, Andrea V.
通讯作者：
Bragas, Andrea V.
影响因子：
2.5
作者：
ASHKIN, A;BOYD, GD;DZIEDZIC, JM
通讯作者：
DZIEDZIC, JM
影响因子：
3.5
作者：
FEJER, MM
通讯作者：
FEJER, MM
影响因子：
2.1
作者：
Bonacina, L.;Mugnier, Y.;Wolf, J.-P.
通讯作者：
Wolf, J.-P.
影响因子：
0.9
作者：
Jais, Pablo M.;von Bilderling, Catalina;Bragas, Andrea V.
通讯作者：
Bragas, Andrea V.