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Wide Dynamic Range, Angle-Sensing, Long-Wave Infrared Detector Using Nano-Antenna Arrays.

Elham Mohammadi1, Mohammad Ghaffari1, Nader Behdad2

  • 1University of Wisconsin-Madison, Department of Electrical and Computer Engineering, Madison, WI, 53706, USA.

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|February 14, 2020
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Summary

We developed a novel angle-sensing detector for long-wave infrared (LWIR) signals using directive antennas. This technology enables precise angle detection by measuring absorbed power ratios, crucial for advanced infrared applications.

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Area of Science:

  • Optoelectronics
  • Infrared Technology
  • Antenna Design

Background:

  • Accurate angle detection is critical for infrared systems.
  • Existing methods may have limitations in sensitivity or size.
  • Long-wave infrared (LWIR) detection requires specialized antenna designs.

Purpose of the Study:

  • To present a new technique for designing angle-sensing LWIR detectors.
  • To demonstrate a compact detector with subwavelength dimensions.
  • To achieve precise angle-of-arrival determination for LWIR signals.

Main Methods:

  • Utilizing two closely-spaced, directive infrared antennas (Yagi-Uda arrays) for angle detection.
  • Optimizing antenna structures to function as both energy collectors and distributed bolometers.
  • Measuring the ratio of absorbed power (via resistance change) in the antennas to determine signal angle.

Main Results:

  • Fabrication and measurement of an angle-sensing detector for λ = 10.6 μm.
  • Achieved subwavelength dimensions of approximately 0.6 λ₀ × 0.4 λ₀.
  • Demonstrated an angle sensing dynamic range of 22 dB over a ±60° field of view.

Conclusions:

  • The proposed Yagi-Uda antenna-bolometer design enables effective LWIR angle sensing.
  • The compact, subwavelength detector offers a significant advancement in infrared sensing capabilities.
  • This technique provides a robust method for determining the angle of arrival of LWIR signals.