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Quantum Plasmonic Immunoassay Sensing.

Nuttawut Kongsuwan1, Xiao Xiong2, Ping Bai2

  • 1The Blackett Laboratory , Imperial College London , Prince Consort Road, London SW7 2AZ , United Kingdom.

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|July 30, 2019
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Summary
This summary is machine-generated.

Quantum plasmonic immunoassay sensing utilizes room-temperature strong coupling for ultra-sensitive detection. This novel approach enhances biosensing capabilities for single molecules, revolutionizing optical sensor technology.

Keywords:
NanoplasmonicsRabi-splittingbiosensingimmunoassaystrong-coupling

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Area of Science:

  • Quantum optics
  • Nanophotonics
  • Biosensing

Background:

  • Plasmon-polaritons enable highly confined electromagnetic fields for optical sensors.
  • Strong coupling of light and matter is crucial for advanced sensing mechanisms.

Purpose of the Study:

  • To propose and validate a quantum plasmonic immunoassay sensing scheme.
  • To integrate room-temperature strong coupling with nanoplasmonic cavities for enhanced sensitivity.

Main Methods:

  • Chemically linking antibody-antigen-antibody complexes with quantum emitter labels.
  • Utilizing nanoplasmonic cavities (hemisphere dimer) to achieve strong coupling.
  • Performing computational experiments with rigorous statistical analysis for sensitivity assessment.

Main Results:

  • Demonstrated a sensitivity enhancement of nearly 1500% compared to conventional plasmonic sensors.
  • Achieved concentration-independent sensitivity down to the single-analyte limit in the quantum sensing regime.
  • Observed signature Rabi splitting due to strong coupling between plasmon-polaritons and quantum emitters.

Conclusions:

  • The quantum plasmonic immunoassay scheme enables single-molecule plasmonic biosensing.
  • This approach opens new avenues for room-temperature quantum sensing using biomolecular protocols and quantum nanoplasmonics.