论文标题
中红外旋转光的几何滤波器光电探测器
Geometric Filterless Photodetectors for Mid-infrared Spin Light
论文作者
论文摘要
自由空间圆形的光（CPL）检测需要极化器和波动板，已经建立了良好的，而这种空间自由度不幸的是在整合的芯片光电上综合。到目前为止，报道的无滤波器CPL光电检测器患有内在的小歧视比，非CPL场成分的脆弱性和较低的响应性。在这里，我们报告了中红外的几何光电探测器的独特范例，表现出巨大的区分比，接近完美的CPL特异性响应，在室温下392 V/W的零偏置响应率以及椭圆效的探测率，椭圆率降低至0.03 $^o $ HZ $ $ HZ $^$ HZ $^$^{-1/2/2} $。我们的方法采用具有明智设计的对称性的等离激元纳米结构阵列，并在石墨烯丝带的协助下，以电读其近场光学信息。这种用于红外光电探测器的几何授权配方为无芯片过滤器CPL检测提供了健壮，直接，严格和高质量的解决方案，并为集成功能性光电设备提供了新的机会。
Free-space circularly polarized light (CPL) detection, requiring polarizers and waveplates, has been well established, while such spatial degree of freedom is unfortunately absent in integrated on-chip optoelectronics. So far, those reported filterless CPL photodetectors suffer from the intrinsic small discrimination ratio, vulnerability to the non-CPL field components, and low responsivity. Here, we report a distinct paradigm of geometric photodetectors in mid-infrared exhibiting colossal discrimination ratio, close-to-perfect CPL-specific response, a zero-bias responsivity of 392 V/W at room temperature, and a detectivity of ellipticity down to 0.03$^o$ Hz$^{-1/2}$. Our approach employs plasmonic nanostructures array with judiciously designed symmetry, assisted by graphene ribbons to electrically read their near-field optical information. This geometry-empowered recipe for infrared photodetectors provides a robust, direct, strict, and high-quality solution to on-chip filterless CPL detection and unlocks new opportunities for integrated functional optoelectronic devices.
