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Related Experiment Videos

Coupled absorption filters for thermal detectors.

Yuyan Wang1, Benjamin J Potter, Joseph J Talghader

  • 1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Optics Letters
|June 14, 2006
PubMed
Summary

A tunable resonant absorption cavity for microbolometers was developed, offering continuous spectral tuning for long-wavelength infrared light. It enhances sensitivity in low-light conditions by switching to a broadband mode.

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Area of Science:

  • Optics and Photonics
  • Infrared Spectroscopy
  • Detector Technology

Background:

  • Microbolometers are crucial thermal detectors for infrared imaging.
  • Tunable optical components are needed to adapt detectors to varying spectral conditions.
  • Existing resonant cavities often lack broad tunability or broadband capabilities.

Purpose of the Study:

  • To demonstrate a novel resonant absorption cavity for long-wavelength infrared (LWIR) light.
  • To enable continuous tunability of the cavity's spectral response.
  • To enhance microbolometer sensitivity, particularly in low-light scenarios.

Main Methods:

  • Fabrication of a resonant absorption cavity coupled to a movable plate.
  • Utilizing electrostatic actuation for voltage-controlled tuning (0-42 V).

Related Experiment Videos

  • Characterization of spectral response and absorption width in tunable and broadband modes.

    • Main Results:

    • Continuous tunability achieved over the 8.7-11.1 micrometer range.
    • Broad resonance width of approximately 1.5 micrometers demonstrated.
    • A broadband mode with an absorption width of 2.83 micrometers was activated at 45 V.

    Conclusions:

    • The developed tunable resonant cavity is suitable for LWIR thermal detectors like microbolometers.
    • Electrostatic actuation provides effective control over spectral selectivity.
    • The broadband mode offers enhanced sensitivity for low-light spectral detection.