Research

Our group pursues diamond nanophotonics with a focus on nanofabrication and nanostructure design. Diamond hosts nitrogen-vacancy (NV) centers, whose electron spins can be initialized and read out optically at room temperature, which makes them promising quantum sensors. Their performance depends heavily on how precisely the diamond is processed and structured, and this is where our strengths lie.

Ultra-precise fabrication.

We developed near-field etching, a non-contact process that yields angstrom-scale flat surfaces without mechanical damage. We demonstrated atomically flat diamond surfaces and the etching of patterned diamond structures. The method also improved the electron spin properties of NV centers in nanodiamonds (Scientific Reports).

Nanostructures for high-sensitivity quantum sensing.

• Diamond micro-resonators enable nanoscale quantum sensors with high magnetic-field sensitivity (Communications Materials).
• NV magnetometers in bulk diamond have been developed for biomedical applications and miniaturized to ultra-high sensitivity (Scientific Reports, JJAP).
• Photon extraction from NV centers is improved by integrating dielectric grating structures on diamond.
• Transfer-printed diamond rings on a silver surface produce high-Q plasmonic resonances (JJAP).

Device integration and spin control.

We developed alignment-tolerant hybrid integration of a diamond quantum sensor (Optics Express) and a chiral microwave metasurface for controlling spins in diamond (npj Nanophotonics). Together with fabrication and nanostructure design, these efforts aim at compact, practical quantum devices.