Research

The Diamond Nanoscience Lab

The Diamond Nanoscience Laboratory is based at Macquarie University and is part of the Quantum Materials & Applications Group (QMAPP) led by Dr. Thomas Volz. The lab engineers next-generation diamond nanotechnologies for applications in quatum information, ultra-high resolution sensing and biomedical applications.

A major research direction of the lab is the use of nitrogen-vacancy (NV) spins for magnetic sensing, spin physics and quantum photonics. The lab also works with other colour centres, including the silicon-vacancy (SiV) centre and the germanium-vacancy (GeV) centre. The Diamond Nanoscience team uses home-built confocal microscopes, both at room and helium temperatures, in combination with an atomic force microscope (AFM), laser sources and microwave equipment to analyse the optical, physical, and spin properties of the nanodiamonds, down to few-nm size. Our cutting-edge setups have enabled important studies on the fluorescence properties of nanodiamonds, including blinking, cooperative forces and superradiance.

The Low-Temperature Cavity QED Lab

The Low-Temperature Cavity QED Laboratory at CSIRO Lindfield complements the facilities/experiments of the Diamond Nanoscience Laboratory at Macquarie University. The Lindfield Laboratory provides excellent environmental conditions and great stability for carrying out experiments with solid-state emitters coupled to semi-integrated fibre cavities at liquid-helium temperatures. Besides the low-T optical fibre-cavity microscope, the lab houses two widely tunable high-power laser systems (cw and pulsed) and a high-resolution spectrometer for carrying out cavity QED studies of low-dimensional semiconductor nanostructures and diamond colour centres such as NV and SiV centres.

Fibre shooting System

The Quantum Materials and Applications group has also set up a home-built state-of-the-art CO2-laser machining and imaging facility at CSIRO Lindfield for the fabrication of curved mirror substrates at the end of optical fibres. The mirror substrates are formed through ablation and melting by shooting a laser pulse at the end of an optical fibre. The system incorporates an optical profilometer which allows us in-situ characterization of the fabricated structures. Once coated by a company overseas, the fibre mirrors are used for our fibre-cavity experiments at the Lindfield Laboratory. We have demonstrated the fabrication of very small curvature radii necessary to achieve strong mode confinement which will give access to strong coupling effects and single-photon non-linearities with solid-state emitters.