In recent years high-index resonant nanoparticles gain a lot of interest due to their strong electric and magnetic response in the visible optical range, which along with strong nonlinear response make them eagerly attractive for enhancing nonlinear effects at the subwavelength. In this work, we show theoretically how AlGaAs nanoresonators elevated temperature modifies efficiency and emission directivity of the second harmonic generation. The proposed system consists of a pulsed femtosecond laser that generates second harmonic emission from the nanoparticle at two different temperatures of 25° and 325° degrees Celsius. Due to the thermo-optical effect the refractive index of the material alters significantly with temperature, thus we obtain the reconfiguration of the second harmonic radiation pattern provided by the spectral shift of the resonant modes position. We believe that such an approach will pave the way for highly efficient nonlinear thermosensors and tunable nanoscale antennas.
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