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Ultrasensitive Diamond Cantilever-Based Optical Microphone.

Shen Tian1,2,3, Chaonan Lin1,4, Yingying Qiao2

  • 1Key Laboratory of Materials Physics, Ministry of Education, School of Physics, Zhengzhou University, Zhengzhou, 450001, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 3, 2025
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Summary

A new diamond cantilever-based optical microphone (DCOM) offers ultrahigh sensitivity and record low noise levels. This high-performance acoustic sensor shows great potential for challenging scientific and industrial applications.

Keywords:
Fabry‐Perot interferometercantileverdiamondoptical microphone

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Area of Science:

  • Acoustics
  • Optical Sensing
  • Materials Science

Background:

  • Microphones are essential for scientific and industrial applications, but achieving high sensitivity and low noise in compact devices is challenging.
  • Existing optical microphones face limitations in performance for demanding tasks like photoacoustic spectrometry and medical imaging.

Purpose of the Study:

  • To develop a novel diamond cantilever-based optical microphone (DCOM) with enhanced sensitivity and detection levels.
  • To evaluate the performance and stability of the DCOM for acoustic sensing in various environments.

Main Methods:

  • Fabrication of a DCOM utilizing a diamond cantilever and a Fabry-Perot interferometric configuration.
  • Characterization of the microphone's sensitivity, noise levels, and detection limits.
  • Testing the DCOM's long-term stability in corrosive environments and its application in far-field acoustic sensing.

Main Results:

  • The DCOM achieved ultrahigh sensitivity of 51.5 VPa-1.
  • A record low detection level of 0.018 µPa/Hz$\rm {\sqrt {Hz}}$ was demonstrated.
  • The device exhibited excellent long-term stability, even in corrosive conditions.

Conclusions:

  • The diamond cantilever-based optical microphone (DCOM) represents a significant advancement in acoustic sensing technology.
  • Its superior performance, including high sensitivity and low noise, makes it suitable for demanding scientific and industrial applications.
  • The DCOM's stability and performance highlight its potential for use in challenging environments and advanced sensing tasks.