We investigate the influence of a static electric field on the incoherent nonlinear response of an unloaded electrically contacted nanoscale optical gap antenna. Upon excitation by a tightly focused near-infrared femtosecond laser beam, a transient elevated temperature of the electronic distribution results in a broadband emission of nonlinear photoluminescence (N-PL). We demonstrate a modulation of the yield at which driving photons are frequency up-converted by means of an external control of the electronic surface charge density. We show that the electron temperature and consequently the N-PL intensity can be enhanced or reduced depending on the command polarity and the strength of the control static field. A modulation depth larger than 100% is observed for activation voltages of a few volts.

中文翻译：

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缝隙天线中光泵浦热电子的静电控制

我们研究了静电电场对空载电接触纳米级光学缝隙天线的非相干非线性响应的影响。在被紧密聚焦的近红外飞秒激光束激发后，电子分布的瞬时升高温度导致非线性光致发光（N-PL）的宽带发射。我们展示了通过电子表面电荷密度的外部控制，对驱动光子进行频率上变频的成品率调制。我们表明，取决于命令极性和控制静态场的强度，可以提高或降低电子温度，从而提高N-PL强度。对于几伏的激活电压，观察到调制深度大于100％。