Wood Thomas, Lhuillier Jérémy, Kemiche Malik, Demongodin Pierre, Vilquin Bertrand, Romeo Pedro Rojo, Belarouci Ali, Berguiga Lotfi, Callard Ségolène, Letartre Xavier, Monat Christelle
Opt Express. 2020 Sep 14;28(19):27506-27523. doi: 10.1364/OE.398480.
We demonstrate a graphene based electro-optic free-space modulator yielding a reflectance contrast of 20% over a strikingly large 250nm wavelength range, centered in the near-infrared telecom band. Our device is based on the original association of a planar Bragg reflector, topped with an electrically contacted double-layer graphene capacitor structure employing a high work-function oxide shown to confer a static doping to the graphene in the absence of an external bias, thereby reducing the switching voltage range to +/-1V. The device design, fabrication and opto-electric characterization is presented, and its behavior modeled using a coupled optical-electronic framework.
我们展示了一种基于石墨烯的电光自由空间调制器，在以近红外电信波段为中心的高达250nm的显著大波长范围内，其反射率对比度达到20%。我们的器件基于平面布拉格反射器的原始组合，顶部是一个电接触的双层石墨烯电容器结构，该结构采用了一种高功函数氧化物，在没有外部偏置的情况下，这种氧化物能赋予石墨烯静态掺杂，从而将开关电压范围降低到+/-1V。本文介绍了该器件的设计、制造和光电特性，并使用耦合光电子框架对其行为进行了建模。
