纳米FRET-LED中银宽带电致发光的光谱聚焦
Spectral focusing of broadband silver electroluminescence in nanoscopic FRET-LEDs
摘要：
很少有发明能像白炽灯泡那样塑造世界。虽然爱迪生使用来自欧姆加热导体的热辐射，但一些贵金属在渗滤膜、隧道二极管、电迁移纳米颗粒聚集体、光学天线或扫描隧道显微镜（STM）中表现出“冷”电致发光（EL）。由于电子跃迁的辐射产率很低，这种辐射的起源是有争议的，它的光谱很宽，取决于施加的偏压。纳米粒子EL是特别有趣的，因为它涉及到本地化的表面等离子体共振与大的偶极矩。这样的等离子体激元使得能够非常有效地非辐射荧光共振能量转移（FRET）耦合到近端共振偶极跃迁。我们展示了纳米FRET-LED利用相反的过程，从银纳米粒子的能量转移到剥离的过渡金属二硫属化物（TMDC）的单层。在衍射限制热点显示出明显的光子聚束，宽带银EL集中到原子薄的覆盖层的窄激子共振。这种器件可以在片上光学互连中提供传统纳米LED的替代方案。
英文摘要：
Few inventions have shaped the world like the incandescent bulb. While Edison used thermal radiation from ohmically heated conductors, some noble metals exhibit "cold" electroluminescence (EL) in percolation films, tunnel diodes, electromigrated nanoparticle aggregates, optical antennae, or scanning-tunnelling microscopy (STM). The origin of this radiation, which is spectrally broad and depends on applied bias, is controversial given the low radiative yields of electronic transitions. Nanoparticle EL is particularly intriguing since it involves localized surface-plasmon resonances with large dipole moments. Such plasmons enable very efficient non-radiative fluorescence resonance energy transfer (FRET) coupling to proximal resonant dipole transitions. We demonstrate nanoscopic FRET-LEDs which exploit the opposite process, energy transfer from silver nanoparticles to exfoliated monolayers of transition-metal dichalcogenides (TMDCs). In diffraction-limited hotspots showing pronounced photon bunching, broadband silver EL is focused into the narrow excitonic resonance of the atomically thin overlayer. Such devices may offer alternatives to conventional nano-LEDs in on-chip optical interconnects.
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