4.8 Article

A room-temperature polarization-sensitive CMOS terahertz camera based on quantum-dot-enhanced terahertz-to-visible photon upconversion

Journal

NATURE NANOTECHNOLOGY
Volume 17, Issue 12, Pages 1288-+

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41565-022-01243-9

Keywords

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Funding

  1. US Army Research Lab (ARL) [W911-NF-18-2-0048]
  2. US Army Research Office through the Institute for Soldier Nanotechnologies [W911-NF-18-2-0048]
  3. Samsung Global Research Outreach (GRO) Program
  4. Samsung GRO Program
  5. Sanford P. Bordeau Chair at the University of Minnesota
  6. McKnight Foundation
  7. AFOSR [FA9550-19-1-0240]
  8. Center for Energy Efficient Electronics Science (NSF) [0939514]
  9. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]

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Researchers have developed a room-temperature terahertz camera and polarimeter based on a quantum-dot-enhanced THz-to-visible upconversion mechanism. The camera offers broadband and fast responses and can detect THz pulses with peak fields as low as 10 kV cm(-1).
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. A terahertz camera based on an upconversion mechanism to the visible range can image both THz polarization state and field strength.

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