Fröch Johannes E, Kim Sejeong, Stewart Connor, Xu Xiaoxue, Du Ziqing, Lockrey Mark, Toth Milos, Aharonovich Igor
Nano Lett. 2020 Apr 8;20(4):2784-2790. doi: 10.1021/acs.nanolett.0c00466. Epub 2020 Mar 5.
Integrating fluorescent nanoparticles with high-, small mode volume cavities is indispensable for nanophotonics and quantum technologies. To date, nanoparticles have largely been coupled to evanescent fields of cavity modes, which limits the strength of the interaction. Here, we developed both a cavity design and a fabrication method that enable efficient coupling between a fluorescent nanoparticle and a cavity optical mode. The design consists of a fishbone-shaped, one-dimensional photonic crystal cavity with a nanopocket located at the electric field maximum of the fundamental optical mode. Furthermore, the presence of a nanoparticle inside the pocket reduces the mode volume substantially and induces subwavelength light confinement. Our approach opens exciting pathways to achieve tight light confinement around fluorescent nanoparticles for applications in energy, sensing, lasing, and quantum technologies.
将荧光纳米颗粒与高、小模式体积的腔相结合对于纳米光子学和量子技术而言必不可少。迄今为止，纳米颗粒很大程度上已与腔模的倏逝场耦合，这限制了相互作用的强度。在此，我们开发了一种腔设计和一种制造方法，能够实现荧光纳米颗粒与腔光学模式之间的高效耦合。该设计由一个鱼骨形的一维光子晶体腔组成，在其基模电场最大值处有一个纳米口袋。此外，口袋内存在纳米颗粒会大幅减小模式体积并导致亚波长光限制。我们的方法为在能量、传感、激光和量子技术等应用中实现围绕荧光纳米颗粒的紧密光限制开辟了令人兴奋的途径。
