|United States Of America||Issued Patent||11,639,975||05/02/2023||2019-105|
Additional Patent Pending
Special properties of Terahertz (THz) radiation find applications in a a large and expanding range of applications. THz can penetrate many materials such as paper, plastic, textiles and foams - resulting in imaging applications such as non-destructive testing and security inspection. Because the fundamental resonances of materials are in the THz range, THz frequencies are useful for spectroscopic applications. The non-ionizing property has advanced application in biomedical imaging. Measuring radiation of a particular frequency is difficult especially for high frequencies. Current methods for THz detection are based on the volume of materials that absorb it and are therefore bulky and require expensive apparatus.
Prof. Jing Shi and his team at UCR have developed an innovative, patent pending THz detector that uses surface effects and therefore can be thin and compact. The invention is related to the magnetic resonance in a type of magnetic material called anti-ferromagnets. The resonance only occurs at specific frequencies that are first determined by materials and can be varied by changing the magnetic field strength of an applied field. This invention involves anti-ferromagnetic resonance and a phenomenon called spin pumping which uses a heavy metal layer (e.g., Platinum, Tantalum, etc.) to electrically detect the radiation in the frequency range of sub-THz to 10 THz.
(a) Continuous-wave (CW) EMR system (see Methods). A 0.240-THz CW is generated by a solid-state source and polarized by a wire-grid polarizer before entering the waveguide. and (b) Sample structure and spin-current injection.
The inventors have developed an experimental, lab-level prototype. They are actively seeking collaborators to scale up and further develop the device.
Please see other inventions by Prof. Jing Shi and his team at UCR.