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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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A spectrally selective visible microbolometer based on planar subwavelength thin films.

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  • 1State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences Shanghai 200083 China.

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We developed a new, low-cost visible microbolometer using metal-insulator-metal films. This compact device achieves spectral selectivity via resonant absorption, offering a significant performance improvement over traditional designs.

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Area of Science:

  • Optoelectronics
  • Nanotechnology
  • Materials Science

Background:

  • Traditional microbolometers often require complex filter structures for spectral selectivity.
  • There is a need for compact, cost-effective microbolometer solutions for visible light detection.

Purpose of the Study:

  • To experimentally demonstrate a novel, compact, and low-cost visible microbolometer.
  • To utilize metal-insulator-metal (MIM) planar subwavelength thin films for resonant absorption-based spectral selectivity.

Main Methods:

  • Fabrication of a microbolometer device using MIM planar subwavelength thin films.
  • Experimental characterization of the device's spectral response and responsivity in the visible range.
  • Comparison with a control device (bare gold bolometer) to quantify performance enhancement.

Main Results:

  • The proof-of-principle microbolometer demonstrated spectrally selective properties in the visible frequency range.
  • A responsivity of approximately 10 mV/W was achieved at room temperature at 638 nm resonant wavelength.
  • The responsivity was about ten times higher than that of the bare gold control device.

Conclusions:

  • The proposed MIM microbolometer offers a viable solution for compact and inexpensive visible light detectors.
  • Resonant absorption in MIM thin films provides spectral selectivity without additional filters.
  • The technology shows promise for large-format fabrication and cost-efficient detector development.