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Ultrafast pyroelectric photodetection with on-chip spectral filters.

  • Stewart, Jon W1
  • Vella, Jarrett H2
  • Li, Wei3
  • Fan, Shanhui3
  • Mikkelsen, Maiken H4, 5
  • 1 Department of Electrical and Computer Engineering, Duke University, Durham, NC, USA.
  • 2 Sensors Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH, USA.
  • 3 Ginzton Laboratory, Department of Electrical Engineering, Stanford University, Stanford, CA, USA.
  • 4 Department of Electrical and Computer Engineering, Duke University, Durham, NC, USA. [email protected]
  • 5 Department of Physics, Duke University, Durham, NC, USA. [email protected]
Published Article
Nature materials
Publication Date
Nov 25, 2019
DOI: 10.1038/s41563-019-0538-6
PMID: 31768011


Thermal detectors, such as bolometric, pyroelectric and thermoelectric devices, are uniquely capable of sensing incident radiation for any electromagnetic frequency; however, the response times of practical devices are typically on the millisecond scale1-7. By integrating a plasmonic metasurface with an aluminium nitride pyroelectric thin film, we demonstrate spectrally selective, room-temperature pyroelectric detectors from 660-2,000 nm with an instrument-limited 1.7 ns full width at half maximum and 700 ps rise time. Heat generated from light absorption diffuses through the subwavelength absorber into the pyroelectric film producing responsivities up to 0.18 V W-1 due to the temperature-dependent spontaneous polarization of the pyroelectric films. Moreover, finite-element simulations reveal the possibility of reaching a 25 ps full width at half maximum and 6 ps rise time rivalling that of semiconductor photodiodes8. This design approach has the potential to realize large-area, inexpensive gigahertz pyroelectric detectors for wavelength-specific detection from the ultraviolet to short-wave infrared or beyond for, for example, high-speed hyperspectral imaging.

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