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Integrated Plasmo-Photonic Sensor with Voltage-Controlled Detection.

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  • 1Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, Warsaw 00-662, Poland.

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Summary
This summary is machine-generated.

This study introduces a novel waveguide sensor that uses plasmonic modes for highly sensitive ion detection. The device achieves record sensitivity, paving the way for advanced chemical and biological analysis.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Integrated Optics

Background:

  • Plasmonic waveguides offer unique light-matter interaction properties.
  • Interferometric sensors are crucial for precise measurements.
  • Existing sensors face limitations in sensitivity and specificity.

Purpose of the Study:

  • To propose and analyze a novel waveguide-integrated interferometric sensor.
  • To leverage plasmonic mode interference for enhanced sensing capabilities.
  • To develop a highly sensitive platform for ion detection in liquids.

Main Methods:

  • Utilizing a vertical plasmonic slot waveguide with separated metal electrodes.
  • Implementing a Mach-Zehnder interferometer configuration.
  • Applying a direct current (DC) voltage to induce ion drift and modulate transmission.

Main Results:

  • Achieved record sensitivity exceeding 12460 nm/RIU at telecom wavelengths (1550 nm).
  • Demonstrated normalized output signal based on ion distribution, not total concentration.
  • Confirmed independent propagation of plasmonic modes on opposing metal electrode edges.

Conclusions:

  • The proposed sensor offers exceptional sensitivity for detecting ion concentration variations.
  • Potential for further sensitivity enhancement at mid-infrared wavelengths.
  • The device serves as a sensitive platform for chemical and biological sensing applications.