A room-temperature polarization-sensitive A room-temperature polarization-sensitive quantum-dot-enhanced terahertz-to-visible photon upconversion
- Journal
- NATURE NANOTECHNOLOGY
- Date
- 2022.11.03
- Abstract
Detection of terahertz (THz) radiation has many potential applications, but presently available detectors are limited in many aspects of their
performance, including sensitivity, speed, bandwidth and operating temperature. Most do not allow the characterization of THz polarization
states. Recent observation of THz-driven luminescence in quantum dots offers a possible detection mechanism via field-driven interdot
charge transfer. We demonstrate a room-temperature complementary metal？oxide？semiconductor THz camera and polarimeter based on
quantum-dot-enhanced THz-to-visible upconversion mechanism with optimized luminophore geometries and fabrication designs.
Besides broadband and fast responses, the nanoslit-based sensor can detect THz pulses with peak fields as low as 10 kV cm？1. A related coaxial nanoaperture-type device shows a to-date-unexplored capability to simultaneously record the THz polarization state and field strength with similar sensitivity.
- Reference
- Nature Nanotechnology (2022)