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Designing Mid-Infrared Gold-Based Plasmonic Slot Waveguides for CO2-Sensing Applications.

Parviz Saeidi1, Bernhard Jakoby1, Gerald Pühringer1

  • 1Institute for Microelectronics and Microsensors, Johannes Kepler University, 4040 Linz, Austria.

Sensors (Basel, Switzerland)
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

Researchers optimized plasmonic slot waveguides for sensing applications by balancing light confinement and propagation length. A new figure of merit (FOM) was introduced, achieving high performance for CO2 sensing.

Keywords:
figure of meritmid-infraredplasmonicssensing applicationsslot waveguide

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Area of Science:

  • Photonics and Nanotechnology
  • Optical Sensing
  • Materials Science

Background:

  • Plasmonic slot waveguides offer high light confinement, crucial for sensing.
  • However, they face challenges with significant propagation loss due to metal components.
  • Optimizing the trade-off between confinement and propagation length is vital for practical applications.

Purpose of the Study:

  • To investigate and optimize gold-based plasmonic slot waveguides on a silicon nitride platform for sensing.
  • To introduce and utilize a novel figure of merit (FOM) for simultaneous enhancement of confinement factor and propagation length.
  • To tailor waveguide designs for specific applications, such as CO2 detection at 4.26 µm.

Main Methods:

  • Utilized silicon nitride as a platform for fabricating free-standing and asymmetric plasmonic slot waveguides.
  • Employed a new figure of merit (FOM) to systematically evaluate and optimize waveguide geometries.
  • Performed simulations and analysis at a wavelength of 4.26 µm, relevant for CO2 absorption.

Main Results:

  • The optimized free-standing plasmonic slot waveguide achieved an FOM of 274.6, with a 42% confinement factor and 868 µm propagation length.
  • The asymmetric plasmonic slot waveguide demonstrated an FOM of 70.1, yielding a 36% confinement factor and 264 µm propagation length.
  • The study successfully demonstrated a method for balancing confinement and propagation in plasmonic waveguides.

Conclusions:

  • The developed figure of merit provides an effective approach for optimizing plasmonic slot waveguides for sensing.
  • Free-standing structures show superior performance in terms of confinement and propagation length compared to asymmetric ones for the targeted application.
  • These findings pave the way for enhanced optical sensing devices, particularly for gas detection like CO2.