论文标题
超模型杂交：使用<0.05μm3无定形吸收剂体积的独立于材料的途径
Supermode hybridization: a material-independent route towards record Schottky detection sensitivity using <0.05 μm3 amorphous absorber volume
论文作者
论文摘要
Schottky光电探测器对CMOS兼容的光子整合电路具有吸引力，但是光子吸收和热载体发射之间的权衡通常会损害检测保真度和灵敏度。在这里，我们报告了一种基于杂交的波导效应，可以提高指导波Schottky检测的灵敏度> 200倍。通过杂交以不对称耦合的等离子纳米结构引导的超模型，即使光吸收区域的厚度仅是少数纳米，也可以显着增强轻度相互作用，从而使吸收和发射效率可以同时优化，以便第一次进行优化。我们的检测器使用仅吸收体积的0.031μm3的吸收体积，表现出-55 dBM的创纪录的实验灵敏度，接近了晶体基于晶体的GE较大吸收区域较大的GE同伴的实验敏感性。在不使用晶体材料的情况下，最大化场重叠并改善光电检测保真度的能力为改善线路互连，单个光子检测和2D光电子的方法铺平了道路。
Schottky photodetectors are attractive for CMOS-compatible photonic integrated circuits, but the trade-off between photon absorption and hot carrier emission often compromises the detection fidelity and sensitivity. Here, we report a hybridization-based waveguiding effect that can improve the sensitivity of guided-wave Schottky detection by >200x. By hybridizing the supermodes guided by asymmetrical coupled plasmonic nanostructures, light-matter-interaction can be significantly enhanced even if the thickness of the light absorbing region is only a few nanometers, thus allowing the absorption and emission efficiencies to be simultaneously optimized for the first time. Using amorphous-based active junction with absorbing volume of only 0.031 μm3, our detectors demonstrate record experimental sensitivity of -55 dBm, approaching that of crystalline-based Ge counterparts with >36x larger absorption region. The ability to maximize field overlap within small device volume and improve photodetection fidelity without using crystalline materials pave the way towards improved back-end-of-line interconnection, single photon detection, and 2D optoelectronics.
