Opt Express. 2023 Apr 10;31(8):12669-12679. doi: 10.1364/OE.485954.
Förster resonance energy transfer (FRET) is a well-known physical phenomenon, which has been widely used in a variety of fields, spanning from chemistry, and physics to optoelectronic devices. In this study, giant enhanced FRET for donor-acceptor CdSe/ZnS quantum dot (QD) pairs placed on top of Au/MoO multilayer hyperbolic metamaterials (HMMs) has been realized. An enhanced FRET transfer efficiency as high as 93% was achieved for the energy transfer from a blue-emitting QD to a red-emitting QD, greater than that of other QD-based FRET in previous studies. Experimental results show that the random laser action of the QD pairs is greatly increased on a hyperbolic metamaterial by the enhanced FRET effect. The lasing threshold with assistance of the FRET effect can be reduced by 33% for the mixed blue- and red-emitting as QDs compared to the pure red-emitting QDs. The underlying origins can be well understood based on the combination of several significant factors, including spectral overlap of donor emission and acceptor absorption, the formation of coherent closed loops due to multiple scatterings, an appropriate design of HMMs, and the enhanced FRET assisted by HMMs.
Förster 共振能量转移（FRET）是一种众所周知的物理现象，已被广泛应用于化学、物理和光电设备等多个领域。在这项研究中，在 Au/MoO 多层双曲超材料（HMM）上放置的供体-受体 CdSe/ZnS 量子点（QD）对实现了巨大的增强 FRET。从蓝色发射的 QD 到红色发射的 QD 的能量转移实现了高达 93%的增强 FRET 转移效率，高于以前基于 QD 的其他 FRET 的效率。实验结果表明，在双曲超材料的增强 FRET 效应的作用下，QD 对的随机激光作用大大增强。与纯红色发射 QD 相比，混合蓝色和红色发射 QD 的 FRET 辅助激光阈值降低了 33%。可以基于几个重要因素的结合来很好地理解其潜在的起源，包括供体发射和受体吸收的光谱重叠、多次散射导致的相干闭环形成、HMM 的适当设计以及 HMM 辅助的增强 FRET。
