thermoreflectance imaging

**Thermoreflectance imaging is a non-contact thermal mapping method that measures tiny changes in surface reflectivity caused by temperature variation.** It is especially valuable in failure analysis because it can reveal where heat is being generated or where heat is being blocked without needing to physically touch the device. This makes it useful for hotspots, power delivery issues, and package or die-level thermal problems. **The method is typically used on exposed surfaces of a chip, an interposer, or a package.** As the device heats up, the reflectivity of the surface changes slightly, and that change can be captured with high-resolution imaging. The result is a map of temperature distribution that helps explain whether the problem is electrical, thermal, or packaging-related. **Thermoreflectance imaging is powerful because it combines speed with spatial detail.** It can highlight localized heating from active circuitry, poor thermal paths, or current crowding. That makes it a strong companion to electrical testing, IR imaging, and cross-sectioning when a team is trying to separate a thermal problem from a purely electrical one. | Use case | What it shows | Why it helps | |---|---|---| | Hotspot detection | Localized heat generation | Finds weak power or layout regions | | Thermal path analysis | Heat spreading and blockage | Explains poor cooling behavior | | Failure isolation | Thermal signature of the defect | Speeds root-cause analysis | ```svg ``` In practice, thermoreflectance imaging is a fast, non-contact way to turn temperature behavior into a visible map that supports root-cause analysis.