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Three-fiber quantum dot probe for hotspot thermometry in electronic packaging
Optics Express
|August 14, 2026
Summary
This study introduces a novel fiber optic sensor for precise, localized temperature monitoring in electronic packaging. It uses quantum dots and a unique fiber probe design for accurate hotspot detection with electromagnetic interference immunity.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Effective thermal management is crucial for next-generation electronic packaging.
- Microscopic hotspots require in-situ monitoring with high spatial resolution and electromagnetic interference (EMI) immunity.
Purpose of the Study:
- To develop a localized hotspot thermometry system for electronic packaging.
- To achieve sub-millimeter spatial resolution and EMI immunity.
Main Methods:
- Utilized a specialized three-fiber probe with temperature-sensitive quantum dots (QDs).
- Employed a 1-excitation-2-collection optical topology for enhanced signal-to-noise ratio (SNR).
- Compared perovskite quantum dots (PeQDs) and InP/ZnS QDs for thermometry.
Main Results:
- The 1-excitation-2-collection design suppressed reflections and maximized collection efficiency.
- PeQDs showed linear amplitude-based thermometry (21-43°C); InP/ZnS QDs used wavelength shift (up to 74°C).
- The system provides accurate, emissivity-independent temperature data.
Conclusions:
- The developed sensor offers a robust alternative to infrared thermography for complex electronic systems.
- This localized thermometry system enables precise characterization of microscopic hotspots.
