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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Optimized microbolometers with higher sensitivity for visible and infrared imaging.

D Razansky1, P D Einziger, D R Adam

  • 1Department of Biomedical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel.

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Summary

Plasmon resonance absorption enhances bolometric detector sensitivity. This method offers tunable, selective thermal detection and imaging, utilizing surface plasmon resonance (SPR) and cavity plasmon resonance (CPR) in metallic films.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Sensor Technology

Background:

  • Bolometric detectors are crucial for thermal sensing and imaging.
  • Improving the sensitivity and selectivity of bolometers is an ongoing challenge.
  • Plasmon resonance absorption is explored as a novel approach for enhancing detector performance.

Purpose of the Study:

  • To investigate plasmon resonance absorption as an optimal method for enhancing bolometric detector sensitivity.
  • To explore the potential of surface plasmon resonance (SPR) and cavity plasmon resonance (CPR) for thermal detection and imaging.
  • To evaluate the characteristics of plasmon resonance absorption for far-field thermal sensing.

Main Methods:

  • Examining the surface plasmon resonance (SPR) regime in metallic films.
  • Investigating a new excitation method: cavity plasmon resonance (CPR).
  • Analyzing the thermal properties of metallic films, specifically thermal diffusivity.

Main Results:

  • Plasmon resonance absorption significantly improves bolometric detector sensitivity.
  • SPR and CPR offer intrinsic spatial selectivity without external focusing lenses.
  • The method provides wide tunability across infrared and visible light domains with high responsivity.
  • Metallic films exhibit high thermal diffusivity, enabling a fast bolometric response.

Conclusions:

  • Plasmon resonance absorption is a highly promising technique for efficient far-field thermal detection and imaging.
  • Both SPR and CPR, occurring in metallic films, offer flexibility in wavelength, bandwidth, and device dimensions.
  • The developed method facilitates miniaturization capabilities for advanced sensor applications.