Abudayyeh Hamza, Mildner Annika, Liran Dror, Lubotzky Boaz, Lüder Lars, Fleischer Monika, Rapaport Ronen
Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
ACS Nano. 2021 Nov 23;15(11):17384-17391. doi: 10.1021/acsnano.1c08591. Epub 2021 Oct 19.
Deterministic GHz-rate single photon sources at room temperature would be essential components for various quantum applications. However, both the slow intrinsic decay rate and the omnidirectional emission of typical quantum emitters are two obstacles toward achieving such a goal which are hard to overcome simultaneously. Here, we solve this challenge by a hybrid approach using a complex monolithic photonic resonator constructed of a gold nanocone responsible for the rate enhancement, enclosed by a circular Bragg antenna for emission directionality. A repeatable process accurately binds quantum dots to the tip of the antenna-embedded nanocone. As a result, we achieve simultaneous 20-fold emission rate enhancement and record-high directionality leading to an increase in the observed brightness by a factor as large as 800 (130) into an NA = 0.22(0.5). We project that these miniaturized on-chip devices can reach photon rates approaching 1.4 × 10 photons/s and pure single photon rates of >10 photons/second after temporal purification processes, thus enabling ultrafast light-matter interfaces for quantum technologies at ambient conditions.
室温下确定性的千兆赫兹速率单光子源将是各种量子应用的关键组件。然而，典型量子发射体缓慢的固有衰减速率和全向发射是实现这一目标的两个障碍，很难同时克服。在这里，我们通过一种混合方法解决了这一挑战，即使用一种复杂的单片光子谐振器，它由负责速率增强的金纳米锥构成，并被用于发射方向性的圆形布拉格天线包围。一个可重复的过程将量子点精确地绑定到嵌入天线的纳米锥尖端。结果，我们实现了发射速率同时提高20倍，并创纪录地提高了方向性，导致在NA = 0.22(0.5)的情况下，观察到的亮度增加了800(130)倍。我们预计，经过时间纯化过程后，这些小型化的片上器件可以达到接近1.4×10个光子/秒的光子速率和大于10个光子/秒的纯单光子速率，从而在环境条件下实现用于量子技术的超快光-物质界面。
