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Explosives detection in a lasing plasmon nanocavity.

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Summary

This study introduces a novel, loss-free active plasmon sensor for ultrasensitive, real-time detection of explosives. The new sensor achieves sub-part-per-billion limits, outperforming existing plasmonic sensors.

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Sensing technology

Background:

  • Plasmonic sensors offer high-sensitivity, real-time, label-free detection.
  • Passive surface plasmon sensors are limited by low quality factors due to metal losses.
  • Active (gain-enhanced) plasmon sensors theoretically offer higher sensitivity through surface plasmon amplification.

Purpose of the Study:

  • To experimentally demonstrate a novel active plasmon sensor free of metal losses.
  • To achieve ultrasensitive detection of analytes, specifically explosives, operating below the diffraction limit.
  • To validate the sensor's performance and compare detection methods.

Main Methods:

  • Development and testing of an active plasmon sensor with loss compensation.
  • Operation deep below the diffraction limit for visible light.
  • Detection of explosives (2,4-dinitrotoluene, ammonium nitrate, nitrobenzene) in air under normal conditions.

Main Results:

  • Demonstrated an intense and sharp lasing emission due to loss compensation.
  • Achieved a sub-part-per-billion detection limit for 2,4-dinitrotoluene and ammonium nitrate.
  • Exhibited selectivity comparable to state-of-the-art explosives detectors.
  • Showcased monitoring lasing intensity as a superior detection method over wavelength shift.

Conclusions:

  • Active plasmon sensors free of metal losses offer significantly enhanced sensitivity.
  • This technology enables ultrasensitive detection of explosives with high selectivity.
  • Nanoscopic sensors utilizing plasmonic lasing hold promise for security screening and biomolecular diagnostics.