论文标题
光学间隙天线中光泵热电子的静电控制
Electrostatic control over optically-pumped hot electrons in optical gap antennas
论文作者
论文摘要
我们研究了静态电场对未载的电纳米纳米级光学间隙天线不连贯的非线性反应的影响。紧密聚焦的近红外飞秒激光束激发时，电子分布的瞬态升高温度会导致非线性光致发光（N-PL）的宽带发射。我们证明了通过对电子表面电荷密度的外部控制，驱动光子频率频率上转换的产量调制。我们表明，根据指挥极性和控制静态场的强度，可以增强或降低电子温度以及N-PL强度。观察到大于100 \％的调制深度用于几伏的激活电压。
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.
