Purcell-Enhanced Emissions from Diamond Color Centers in Slow Light Photonic Crystal Waveguides

Area of Science:

• Quantum optics
• Solid-state physics
• Nanophotonics

Background:

• Diamond color centers, like silicon-vacancy (SiV) centers, are promising for quantum memories.
• Efficient photonic interfaces are crucial for their application, but achieving overlap with emitters is challenging.
• Nanophotonic cavities and slow light waveguides are explored for enhanced light-matter interaction.

Purpose of the Study:

• To demonstrate diamond slow light photonic crystal (PhC) waveguides optically coupled to embedded SiV color centers.
• To develop a practical platform for robust spin-photon interfaces using diamond nanophotonics.

Main Methods:

• Fabrication of fully suspended 2D PhC waveguides in thin-film diamond.
• Optical coupling of embedded SiV color centers to the PhC waveguide modes.
• Characterization of waveguide modes and SiV emission properties.

Main Results:

• Demonstration of diamond PhC waveguides with high group indices (up to 70).
• Observation of Purcell-enhanced emission from embedded SiV color centers.
• Successful optical coupling between SiV emitters and slow light modes.

Conclusions:

• The developed diamond slow light PhC waveguides offer a practical platform for robust spin-photon interfaces.
• This approach overcomes challenges in spectral and spatial overlap for solid-state quantum emitters.
• The platform shows potential for advanced quantum memory applications.