Grant: Alliance Grants

The proposed research aims to develop a novel quantum-based THz radiation detection technology using superfluid liquid helium. THz waves, known for their ability to penetrate clothing and packaging while posing minimal risk to biological tissues, have applications in non-invasive medical diagnostics, hazard-free security screening, and quality control. Hence, by initiating the development of new THz detection and imaging platform, the proposed research program will greatly improve the health, safety and security of Canadian citizens, who are routinely exposed to numerous scanning and screening procedures. Current semiconductor-based THz technology has limitations such as slow response times, low spatial resolution, and high costs per pixel. In this research, we leverage the unique spectroscopic property of superfluid helium to absorb THz radiation via quantum many-body excitations known as rotons. Recent discoveries by our groups at UBC have shown that ultrashort laser pulses can produce rotons in a controlled way, with their energy determined by the properties of the laser light. The combination of the laser-assisted injection of rotons in superfluid helium and their absorption of THz waves offers a unique opportunity to develop novel THz probes with superior time response and spatial resolution. Through a collaborative partnership with Meta Materials Inc. and Zero Point Cryogenics, industry leaders in material development and cryogenic technology, we aim to combine ultrafast laser optics and THz detection using superfluid helium's quantum properties. This partnership, together with the expertise from three research groups at the University of British Columbia, positions Canada at the forefront of pioneering first-of-a-kind quantum-based THz technology.