We demonstrate optically tunable control of second-harmonic generation in all-dielectric nanoantennas: by using a control beam that is absorbed by the nanoresonator, we thermo-optically change the refractive index of the radiating element to modulate the amplitude of the second-harmonic signal. For a moderate temperature increase of roughly 40 K, modulation of the efficiency up to 60% is demonstrated; this large tunability of the single meta-atom response paves the way to exciting avenues for reconfigurable homogeneous and heterogeneous metasurfaces.

中文翻译：

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用于热光可重构非线性超表面的介电纳米天线的光学调谐

我们展示了全介电纳米天线中二次谐波产生的光学可调控制：通过使用被纳米谐振器吸收的控制光束，我们以光学方式改变辐射元件的折射率以调制二次谐波信号的幅度。对于大约40 K的温和温升，效率可调节至60％。单个亚原子响应的巨大可调谐性为可重构的均质和异质超表面提供了令人兴奋的途径。