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Single-defect spectroscopy in the shortwave infrared

Author

Listed:
  • Xiaojian Wu

    (University of Maryland)

  • Mijin Kim

    (University of Maryland)

  • Haoran Qu

    (University of Maryland)

  • YuHuang Wang

    (University of Maryland
    University of Maryland)

Abstract

Chemical defects that fluoresce in the shortwave infrared open exciting opportunities in deep-penetration bioimaging, chemically specific sensing, and quantum technologies. However, the atomic size of defects and the high noise of infrared detectors have posed significant challenges to the studies of these unique emitters. Here we demonstrate high throughput single-defect spectroscopy in the shortwave infrared capable of quantitatively and spectrally resolving chemical defects at the single defect level. By cooling an InGaAs detector array down to −190 °C and implementing a nondestructive readout scheme, we are able to capture low light fluorescent events in the shortwave infrared with a signal-to-noise ratio improved by more than three orders-of-magnitude. As a demonstration, we show it is possible to resolve individual chemical defects in carbon nanotube semiconductors, simultaneously collecting a full spectrum for each defect within the entire field of view at the single defect limit.

Suggested Citation

  • Xiaojian Wu & Mijin Kim & Haoran Qu & YuHuang Wang, 2019. "Single-defect spectroscopy in the shortwave infrared," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10788-8
    DOI: 10.1038/s41467-019-10788-8
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