Ma Jian, Zhang Hongyuan, Lou Yuanhao, Min Qiuhong, Wu Dan, Wang Yirui, Pang Yuanjie
School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
Nano Lett. 2024 Oct 9;24(40):12605-12611. doi: 10.1021/acs.nanolett.4c03677. Epub 2024 Sep 30.
Single-emitter nanoantennas play a crucial role in the fabrication of nanosensors and integrated sources. Since the coupling of single emitter to nanoantennas is largely based on stochastic methods, low qualified rate still hinders a massive deployment. Here, we proposed a deterministic, optical-force-driven method to achieve gap-plasmonic photoluminescence enhancement. Two deterministic steps are carried out in sequence: a composite nanoemitter is first synthesized by linking quantum dots to a silica-rapped gold nanoparticle, followed by an optical delivery of the nanoparticle into a nanoaperture in a gold film. We reason that the nanoparticle-in-nanoaperture (NPiNA) structure efficiently couples out-of-plane excitation light into a gap-plasmon via a transverse electromagnetic mode (TEM)-like transmission mode. An photoluminescence measurement demonstrates a 3× brightness as compared to the nanoparticle-on-mirror (NPoM). This approach paves the way toward deterministic positioning of individual nanoparticles for a wide range of applications on nanophotonics structures on-a-chip.
单发射体纳米天线在纳米传感器和集成光源的制造中起着至关重要的作用。由于单发射体与纳米天线的耦合很大程度上基于随机方法，低合格率仍然阻碍了大规模应用。在此，我们提出了一种确定性的、光力驱动的方法来实现间隙等离子体光致发光增强。依次执行两个确定性步骤：首先通过将量子点连接到二氧化硅包裹的金纳米颗粒合成复合纳米发射体，然后将纳米颗粒光学输送到金膜中的纳米孔中。我们推断，纳米孔内纳米颗粒（NPiNA）结构通过类似横向电磁模式（TEM）的传输模式将面外激发光有效地耦合到间隙等离子体中。光致发光测量表明，与镜上纳米颗粒（NPoM）相比，亮度提高了3倍。这种方法为在片上纳米光子结构上的广泛应用中单个纳米颗粒的确定性定位铺平了道路。
