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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Published on: December 27, 2012

Midwave thermal infrared detection using semiconductor selective absorption.

Ryan P Shea1, Anand S Gawarikar, Joseph J Talghader

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

Optics Express
|December 18, 2010
PubMed
Summary
This summary is machine-generated.

Thermal detectors with non-uniform spectral absorption surpass traditional limits. Novel designs using lead selenide achieve significantly lower noise, enhancing performance beyond the blackbody limit for infrared detection.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Infrared Technology

Background:

  • Traditional thermal detectors are often assessed against a blackbody absorber limit.
  • Non-uniform spectral absorption in detector materials can influence performance.
  • Mid-wave infrared (MWIR) devices are crucial for various sensing applications.

Purpose of the Study:

  • To derive the performance of thermal detectors with non-uniform spectral absorption.
  • To analyze noise sources and optimize detector design for enhanced detectivity.
  • To explore novel materials and fabrication methods for spectrally selective thermal detectors.

Main Methods:

  • Theoretical derivation of thermal detector performance considering non-uniform spectral absorption.
  • Design and analysis of mid-wave infrared (MWIR) devices using lead selenide absorbers and optical cavities.
  • Investigation of noise sources and fabrication of spectrally selective devices using plasmonic structures.

Main Results:

  • Detectors with low absorption in primary thermal emission bands exhibit reduced background radiation noise.
  • Room-temperature devices achieved detectivities up to 4.37 × 10^10 cm Hz^(1/2) W^(-1), exceeding the blackbody limit by a factor of 3.1.
  • Plasmonic patterning in silver offers an alternative method for fabricating spectrally selective thermal detectors.

Conclusions:

  • Non-uniform spectral absorption is a viable strategy to improve thermal detector performance beyond conventional limits.
  • Optimized optical coupling and material selection, such as lead selenide, are key to achieving high detectivity.
  • The findings pave the way for next-generation infrared detectors with superior sensitivity and reduced noise.