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Single-defect spectroscopy in the shortwave infrared.

Xiaojian Wu1, Mijin Kim1, Haoran Qu1

  • 1Department of Chemistry and Biochemistry, University of Maryland, 8051 Regent Drive, College Park, MD, 20742, USA.

Nature Communications
|June 19, 2019
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Summary
This summary is machine-generated.

Researchers developed a new method for studying single chemical defects that glow in the shortwave infrared. This technique significantly improves signal detection for applications in deep-penetration bioimaging and quantum technologies.

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Spectroscopy

Background:

  • Chemical defects emitting in the shortwave infrared (SWIR) are promising for bioimaging, sensing, and quantum applications.
  • Studying these atomic-scale defects is challenging due to detector noise and defect size.

Purpose of the Study:

  • To develop a high-throughput method for single-defect spectroscopy in the SWIR.
  • To overcome challenges in detecting faint SWIR fluorescence from atomic-scale defects.

Main Methods:

  • Utilized a cooled InGaAs detector array (-190°C) for enhanced sensitivity.
  • Implemented a nondestructive readout scheme to improve signal-to-noise ratio by over three orders of magnitude.
  • Achieved quantitative and spectral resolution of individual chemical defects.

Main Results:

  • Demonstrated high-throughput single-defect spectroscopy in the SWIR.
  • Successfully resolved individual chemical defects in carbon nanotube semiconductors.
  • Collected full spectra for each defect within the field of view at the single-defect limit.

Conclusions:

  • The developed method enables detailed characterization of SWIR-emitting chemical defects at the single-defect level.
  • This advancement is crucial for realizing the potential of SWIR emitters in various scientific and technological fields.
  • The technique offers a powerful tool for exploring novel quantum emitters and advanced sensing platforms.