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Ultrathin-Gold-Resonators-Enabled Bolometers with High Linearity, Responsivity, and Repeatability.

Jiaqi Wu1, Luming Wang1, Jing Yu2

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 24, 2026
PubMed
Summary

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This summary is machine-generated.

Researchers developed ultrathin gold nanomechanical resonant sensors capable of high-frequency vibrations. These nanoscale bolometers demonstrate excellent linearity, responsivity, and repeatability for advanced sensing applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Ultrathin metal films possess unique optical and electronic properties distinct from bulk metals.
  • These films hold significant potential for advanced sensing applications.
  • Integrating mechanical degrees of freedom into ultrathin films could enhance sensing capabilities but remains underexplored.

Purpose of the Study:

  • To demonstrate ultrathin gold nanomechanical resonant sensors with high-frequency vibrations.
  • To investigate the potential of these devices as nanoscale bolometers.
  • To explore the frequency scaling laws and material properties of these nanomechanical sensors.

Main Methods:

  • Fabrication of ultrathin gold nanomechanical resonant sensors.
Keywords:
bolometersfrequency scalingnanomechanical resonatorsultrathin metal

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  • Characterization of sensor vibrations in the high frequency (HF) and very high frequency (VHF) bands.
  • Evaluation of sensor performance as nanoscale bolometers under varying laser power.

    • Main Results:

    • Demonstrated robust high-frequency (HF and VHF) vibrations in ultrathin gold nanomechanical sensors.
    • Achieved nanoscale bolometer functionality with good linearity (nonlinearity factor of 0.0865) and high power-to-frequency responsivity (∼-11.47 ppm·µW⁻¹).
    • Exhibited excellent repeatability across a wide laser power range (2.3 µW-0.48 mW) and elucidated frequency scaling laws.

    Conclusions:

    • Ultrathin gold nanomechanical resonant sensors can operate as effective nanoscale bolometers.
    • The study determined the Young's modulus (75.6 GPa) and pretension (0.09-0.8 N·m⁻¹) of the ultrathin gold.
    • This research enables future wafer-scale design and on-chip integration of ultrathin metal nanomechanical sensors.