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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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MEMS-Based Wavelength-Selective Bolometers.

Thang Duy Dao1, Anh Tung Doan2,3, Satoshi Ishii4

  • 1International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. dao.duythang@nims.go.jp.

Micromachines
|June 26, 2019
PubMed
Summary

We developed novel membrane-supported, wavelength-selective infrared (IR) bolometers using amorphous silicon (a-Si). These compact devices enable precise IR spectroscopy by responding only to specific wavelengths, offering a new solution for IR sensing applications.

Keywords:
amorphous siliconbolometersinfrared sensorsmicroelectromechanical systems (MEMS)perfect absorberswavelength-selective sensors

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Area of Science:

  • Microelectromechanical Systems (MEMS)
  • Infrared (IR) Spectroscopy
  • Solid-State Physics

Background:

  • Traditional infrared (IR) bolometers lack wavelength selectivity, limiting their use in spectroscopic applications.
  • Achieving wavelength selectivity in IR detectors is crucial for advanced sensing and imaging.

Purpose of the Study:

  • To propose and demonstrate a compact, membrane-supported, wavelength-selective IR bolometer design.
  • To enable amorphous silicon (a-Si) bolometers to respond to specific resonance wavelengths for spectroscopic analysis.

Main Methods:

  • Numerical simulations were performed to optimize the geometrical parameters of the wavelength-selective absorbers.
  • Fabrication of the proposed bolometer devices with specific resonance characteristics.
  • Experimental characterization of the spectral response and tunability of the fabricated devices.

Main Results:

  • The fabricated devices demonstrated tunable resonance in the mid-wavelength IR atmospheric window by altering resonator size.
  • The measured spectral response precisely matched the designed resonance wavelengths.
  • The experimental results validated the feasibility of the proposed wavelength-selective IR bolometer concept.

Conclusions:

  • The developed membrane-supported, wavelength-selective a-Si bolometers offer a practical solution for on-chip IR spectroscopic devices.
  • This work advances the development of miniaturized and efficient IR sensing technologies.
  • The tunable resonance capability opens possibilities for versatile IR detection systems.