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Micro-current and voltage detection based on metal-dielectric core-shell WGM microcavity
Optics Express
|December 19, 2025
Summary
This study introduces a novel method for detecting micro-current using laser resonance in a specialized microcavity. This technique offers a new strategy for precise low voltage and current measurements in electronic devices.
Area of Science:
- Optoelectronics
- Nanotechnology
- Materials Science
Background:
- Accurate measurement of low voltage and current is essential for advanced electronic integrated devices.
- Direct measurement methods face significant challenges, necessitating alternative approaches.
Purpose of the Study:
- To propose and demonstrate a new method for micro-current detection.
- To utilize laser resonance mode movement in a metal-dielectric core-shell whispering gallery mode (WGM) microcavity for this purpose.
Main Methods:
- Fabrication of a stable metal-dielectric core-shell hybrid microcavity using a brush-coating method.
- Achieving electrically tunable WGM lasing via the thermo-optic effect.
- Observing and quantifying the tuning rate of laser resonant modes.
Main Results:
- The hybrid microcavity exhibits high stability and a low lasing threshold of 16.8 μJ/cm2.
- Electrically tunable WGM lasing was successfully demonstrated.
- A tuning rate of 9.9 nm/V for the lasing peaks was achieved.
Conclusions:
- The proposed method offers a novel strategy for micro-current and voltage detection.
- The developed metal-dielectric core-shell WGM microcavity is a promising platform for sensitive measurements.
- This research advances techniques for characterizing low-level electrical parameters in integrated systems.
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