Double Blind Ultrafast Pulse Characterization by Mixed Frequency Generation in a Gold Antenna
Double Blind Ultrafast Pulse Characterization by Mixed Frequency Generation in a Gold Antenna
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DOI：
10.1021/acsphotonics.8b00387
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发表时间：
2018-08-01
期刊：
影响因子：
7
通讯作者：
Oulton, Rupert F.
中科院分区：
文献类型：
--
作者：
Gennaro, Sylvain D.;Li, Yi;Oulton, Rupert F.
超快脉冲的表征需要分析光脉冲在非线性介质中混频产生的相关函数。在这项工作中，我们使用一个黄金光学纳米天线，同时产生四波混频和和频率产生整个调谐范围的钛：蓝宝石和光学参量振荡器（OPO）系统。由于金属纳米颗粒在不需要相位匹配的情况下就能产生非常强的非线性响应，因此我们可以使用单个谱图同时表征未知的OPO脉冲及其泵浦脉冲。非线性混合足够有效地恢复能量在皮焦耳范围内的脉冲。
Ultrafast pulse characterization requires the analysis of correlation functions generated by frequency mixing of optical pulses in a nonlinear medium. In this work, we use a gold optical nanoantenna to generate simultaneously Four Wave Mixing and Sum Frequency Generation across the tuning range of a Ti:Sapphire and Optical Parametric Oscillator (OPO) system. Since metal nanoparticles create remarkably strong nonlinear responses for their size without the need for phase matching, this allows us to simultaneously characterize the unknown OPO pulse and its pump pulse using a single spectrogram. The nonlinear mixing is efficient enough to retrieve pulses with energies in the picojoule range.