Speaker: Hamish Greenall
Affiliation: University of Queensland


Magnetometers have many applications including magnetic anomaly detection, geophysical mapping, magnetic resonance imaging and more. The current state-of-the-art commercially available magnetometers, superconducting quantum interference device (SQUID) magnetometers, require a cryogenic environment to operate; as such they are expensive, bulky and power hungry. In our lab, we have created microtoroidal cavity optomechanical magnetometers operating in the MHz frequency range, which have achieved state-of-the-art sensitivities comparable to SQUIDS using only microwatt power consumption and without the need for cryogenics. These however fail at low frequencies, where many applications operate. In my PhD I am engineering new forms of cavity optomechanical magnetometers that are capable of high sensitivity at low frequencies, using microresonators with hybridised optical modes. In my talk I will discuss their predicted performance, the results from devices fabricated thus far and my plans to demonstrate their use in applications, such as kHz frequency communications and deployment on a UAV.

About Physics Seminars

The weekly Physics Seminar series focuses on a broad range of physics research within SMP, along with frequent presentations from visiting researchers. Seminars are usually scheduled for 1.00pm on Tuesdays.

The talks are typically more specialised than a colloquium but are often attended by staff and PhD students across a broad range of areas. Speakers are thus encouraged to include introductory material in the talks.

All SMP researchers and HDR students are encouraged to speak. Please email Lewis Williamson to register your interest.

The seminars are open so there is no need to register your attendance.


Physics Annexe (06)
407 (and via Zoom https://uqz.zoom.us/j/94116861984)