Photonic nanobeam cavities with nano-pockets for efficient integration of fluorescent nanoparticles

Abstract

Integrating fluorescent nanoparticles with high-Q, 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 nano-pocket 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 strong light confinement around fluorescent nanoparticles for applications in energy, sensing, lasing and quantum technologies.

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Cited by in corpus (4)

• Integrated Single Photon Emitters
• Focus the electromagnetic field to $10^{-6}\lambda$ for ultra-high enhancement of field-matter interaction
• Hybrid quantum photonics based on artificial atoms placed inside one hole of a photonic crystal cavity
• 'Sawfish' Photonic Crystal Cavity for Near-Unity Emitter-to-Fiber Interfacing in Quantum Network Applications