Centini Marco, Benedetti Alessio, Sibilia Concita, Bertolotti Mario
Dipartimento di Scienze di Base e Applicate per l'Ingegneria (SBAI), Sapienza Università di Roma, Roma, Italy.
Opt Express. 2011 Apr 25;19(9):8218-32. doi: 10.1364/OE.19.008218.
We report results of second harmonic generation calculations performed on Silver coupled 2D-nanoresonators. Coupling is responsible for the creation of resonant modes that can be localized on small portions of the structure or distributed over the whole structure. Different field profiles can be obtained by varying the parameters of the input field (i.e. the wavelength). The second harmonic generation nonlinear process is enhanced by the excitation of coupled surface plasmon polaritons. The emitted field is strongly affected by the linear properties of the structure behaving as a nano antenna. We note that different configurations of the pump field lead to different second harmonic far-field emission patterns. Also, we show that the angular emission of the second harmonic field contains information about the spatial location of the pump field hot spots at different frequencies. Applications to a new class of nano sources for single molecule fluorescence and sensors are proposed.
我们报告了对银耦合二维纳米谐振器进行二次谐波产生计算的结果。耦合作用导致了谐振模式的产生，这些模式可以局域在结构的小部分区域，也可以分布在整个结构上。通过改变输入场的参数（即波长），可以获得不同的场分布。耦合表面等离激元极化子的激发增强了二次谐波产生的非线性过程。发射场受到作为纳米天线的结构的线性特性的强烈影响。我们注意到泵浦场的不同配置会导致不同的二次谐波远场发射模式。此外，我们表明二次谐波场的角发射包含了不同频率下泵浦场热点空间位置的信息。文中还提出了其在新型单分子荧光纳米源和传感器方面的应用。
