Spin-based detection of terahertz and sub-terahertz electromagnetic radiation
US11639975B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2020 |
| Grant date | May 2, 2023 |
| Priority date | — |
| Expiry date | Aug 14, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N50/80
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods for spin-based detection of electromagnetic radiation at terahertz and sub-terahertz frequencies is provided. The detector can include a heterostructure, a magnetic field generator, and an electrical circuit. The heterostructure can include a first layer formed of an antiferromagnetic material (AFM) in contact with a second layer of a heavy metal (HM) or a topological insulator. The magnetic field generator can generate a magnetic field oriented approximately parallel to an easy axis of the first layer and approximately parallel to a propagation direction of electromagnetic radiation. The circuit can be in electrical communication with the second layer. The first layer can inject a spin current into the second layer in response to receipt of electromagnetic radiation having a sub-terahertz or terahertz frequency. The second layer can convert the injected spin current into a potential difference. The circuit can be configured to output a signal corresponding to the potential difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.