Light-induced symmetry breaking for enhancing second-harmonic generation from an ultrathin plasmonic nanocavity.
Light-induced symmetry breaking for enhancing second-harmonic generation from an ultrathin plasmonic nanocavity.
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光诱导对称性破缺增强超薄等离子体纳米腔的二次谐波产生
DOI：
10.1038/s41467-021-24408-x
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发表时间：
2021-07-15
影响因子：
16.6
通讯作者：
Zayats AV
中科院分区：
文献类型：
--
作者：
Li GC;Lei D;Qiu M;Jin W;Lan S;Zayats AV
在纳米尺度下相干光的高效频率上转换对于各种现代光子学应用是高度要求的，但它在纳米光子学中仍然具有挑战性。贵金属的表面二阶非线性可以通过等离子体激元诱导的场增强而显著增强，然而在高度对称的等离子体激元纳米结构中，尽管有巨大的近场放大，但相关的远场二次谐波产生（SHG）也可能被猝灭。在这里，我们证明了从一个单一的金纳米球的SHG显着增强时，紧密耦合到金属膜，即使在没有等离子体共振在SH频率。纳米间隙结中的光致电磁不对称性有效地抑制了局部产生的SHG场的抵消，并且SH发射通过优先耦合到纳米腔的明亮的键合偶极共振模式而被进一步放大。远场SHG转换效率高达W − 1，由直径为100 nm的单个金纳米球证明，比复杂的双共振等离子体纳米结构高两个数量级。这种来自金属纳米腔的高效SHG也构成了超灵敏的非线性纳米探针，以映射纳米光子系统中纵向矢量光场的分布。
Efficient frequency up-conversion of coherent light at the nanoscale is highly demanded for a variety of modern photonic applications, but it remains challenging in nanophotonics. Surface second-order nonlinearity of noble metals can be significantly boosted up by plasmon-induced field enhancement, however the related far-field second-harmonic generation (SHG) may also be quenched in highly symmetric plasmonic nanostructures despite huge near-field amplification. Here, we demonstrate that the SHG from a single gold nanosphere is significantly enhanced when tightly coupled to a metal film, even in the absence of a plasmon resonance at the SH frequency. The light-induced electromagnetic asymmetry in the nanogap junction efficiently suppresses the cancelling of locally generated SHG fields and the SH emission is further amplified through preferential coupling to the bright, bonding dipolar resonance mode of the nanocavity. The far-field SHG conversion efficiency of up toW−1is demonstrated from a single gold nanosphere of 100 nm diameter, two orders of magnitude higher than for complex double-resonant plasmonic nanostructures. Such highly efficient SHG from a metal nanocavity also constitutes an ultrasensitive nonlinear nanoprobe to map the distribution of longitudinal vectorial light fields in nanophotonic systems.
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影响因子：
64.8
作者：
Chikkaraddy R;de Nijs B;Benz F;Barrow SJ;Scherman OA;Rosta E;Demetriadou A;Fox P;Hess O;Baumberg JJ
通讯作者：
Baumberg JJ
影响因子：
3.7
作者：
Bachelier, G.;Butet, J.;Brevet, P-F
通讯作者：
Brevet, P-F
影响因子：
10.8
作者：
Metzger, Bernd;Gui, Lili;Giessen, Harald
通讯作者：
Giessen, Harald
等离激元九聚体中与偏振无关的多重 Fano 共振，用于多模匹配增强型多频带二次谐波生成
影响因子：
17.1
作者：
Liu, Shao-Ding;Leong, Eunice Sok Ping;Lei, Dang Yuan
通讯作者：
Lei, Dang Yuan
影响因子：
7
作者：
Carletti, Luca;Marino, Giuseppe;Neshev, Dragomir N.
通讯作者：
Neshev, Dragomir N.