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Active Control of Multiple, Simultaneous Nonlinear Optical Processes in Plasmonic Nanogap Cavities
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-17 , DOI: 10.1021/acsphotonics.0c00011 Qixin Shen , Weiliang Jin 1 , Guoce Yang 2 , Alejandro W. Rodriguez 1 , Maiken H. Mikkelsen
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-17 , DOI: 10.1021/acsphotonics.0c00011 Qixin Shen , Weiliang Jin 1 , Guoce Yang 2 , Alejandro W. Rodriguez 1 , Maiken H. Mikkelsen
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Plasmonic structures are promising to enhance and control nonlinear optical processes as the subwavelength-scale elements not only increase the local electric field intensities, but also result in relaxed phase matching conditions. This opens the possibility to observe and further manipulate multiple nonlinear optical processes simultaneously, which would be forbidden in bulk crystals due to incompatible phase matching requirements. Here we enhance and control the relative strength between third harmonic generation (THG), sum frequency generation (SFG), and four wave mixing (FWM) arising from 1 to 7 nm Al2O3 layers sandwiched between a gold film and silver nanorectangles. We demonstrate that the relative strength of the three, simultaneous nonlinear optical processes can be precisely controlled by either the ratio between the powers of the two excitations or the thickness of the Al2O3 layer. Furthermore, enhancements up to 106-fold for THG and FWM are observed along with 104-fold enhancements for SFG response when the resonance of the transverse and longitudinal mode of the cavity are matched to the two pump excitations. The ability to obtain and control multiple, nonlinear optical processes simultaneously open new capabilities for advanced on-chip manipulation and processing of optical signals on the deep nanoscale.
中文翻译：
等离子体纳米间隙腔中多个同时非线性光学过程的主动控制
等离子激元结构有望增强和控制非线性光学过程，因为亚波长标度元素不仅增加了局部电场强度，而且导致了宽松的相位匹配条件。这为同时观察和进一步操纵多个非线性光学过程提供了可能性，由于不匹配的相位匹配要求，块状晶体中将禁止这样做。在这里，我们增强并控制由1至7 nm Al 2 O 3引起的三次谐波产生（THG），总频率产生（SFG）和四波混频（FWM）之间的相对强度。层夹在金膜和银纳米矩形之间。我们证明了，这三个同时发生的非线性光学过程的相对强度可以通过两种激发光的功率之比或Al 2 O 3层的厚度来精确控制。此外，当腔的横向和纵向模态的共振与两个泵浦激发相匹配时，观察到THG和FWM的增强高达10 6倍，SFG反应的增强了10 4倍。同时获得和控制多个非线性光学过程的能力为深度纳米级光学信号的高级片上处理和处理打开了新的能力。
更新日期：2020-04-23
中文翻译：
等离子体纳米间隙腔中多个同时非线性光学过程的主动控制
等离子激元结构有望增强和控制非线性光学过程，因为亚波长标度元素不仅增加了局部电场强度，而且导致了宽松的相位匹配条件。这为同时观察和进一步操纵多个非线性光学过程提供了可能性，由于不匹配的相位匹配要求，块状晶体中将禁止这样做。在这里，我们增强并控制由1至7 nm Al 2 O 3引起的三次谐波产生（THG），总频率产生（SFG）和四波混频（FWM）之间的相对强度。层夹在金膜和银纳米矩形之间。我们证明了，这三个同时发生的非线性光学过程的相对强度可以通过两种激发光的功率之比或Al 2 O 3层的厚度来精确控制。此外，当腔的横向和纵向模态的共振与两个泵浦激发相匹配时，观察到THG和FWM的增强高达10 6倍，SFG反应的增强了10 4倍。同时获得和控制多个非线性光学过程的能力为深度纳米级光学信号的高级片上处理和处理打开了新的能力。
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