Phys.org September 2, 2021
Quantum dots often suffer from adjacent unwanted emitters, which contribute to the background noise of the QD emission and fundamentally limit the single-photon purity. Researchers in South Korea developed a technique that can isolate the desired quality emitter by reducing the noise surrounding the target with what they have dubbed a ‘nanoscale focus pinspot. The technique is a structurally nondestructive technique under an extremely low dose ion beam and is generally applicable for various platforms to improve their single-photon purity while retaining the integrated photonic structures. Using this technique they focused the ion beam on a mere pin prick, effectively cutting off the interactions around the quantum dot and removing the physical properties that could negatively interact with and degrade the photon purity emitted from the quantum dot. According to the researchers by adjusting the focused ion beam-irradiated region, the target emitter can be selected with nanoscale resolution by quenching the surrounding emitter. The technique can be applied to various material and structural platforms and further extended for applications such as optical memory and high-resolution micro displays…read more. Open Access TECHNICAL ARTICLEÂ
Abstract. Credit: ACS Nano, 2021, 15, 7, 11317–11325, June 24, 2021Â