Modelling And Optimization Of The Second-Harmonic Radiation Pattern In Dielectric Nanoantennas
نویسندگان
چکیده
We present numerical results that describe how to engineer the radiation pattern of the second harmonic (SH) signal generated by AlGaAs on aluminum oxide all-dielectric nanoantennas. The SH beam divergence is minimized by coherent forward and backward scattering of the radiation emitted at grazing angles from the optical antenna toward a concentric grating grown on the aluminum oxide substrate, whereas the symmetry of the SH mode is converted by introducing a suitablydesigned phase shift. The parameters of the structure are optimized through extensive numerical simulations and design guidelines for fabrication are provided.
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تاریخ انتشار 2016