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Lock-in infrared illumination for high-resolution microscopic thermal imaging
Optics Letters
|December 1, 2025
Summary
This study introduces a new lock-in infrared illumination technique to significantly improve infrared thermal imaging quality. The method enhances contrast and reduces noise for high-resolution microscopic applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Semiconductor Physics
Background:
- Conventional infrared (IR) thermal imaging at ambient temperatures suffers from low image contrast and high noise.
- These limitations restrict the application of IR thermal imaging in high-resolution microscopic imaging.
- Existing contrast enhancement methods often have drawbacks for practical integration.
Purpose of the Study:
- To develop an in-situ method for enhancing infrared image quality in microscopic thermal imaging.
- To improve image contrast, resolution, and noise suppression for IR imaging.
- To demonstrate the practical application of the developed technique.
Main Methods:
- Implementation of an in-situ lock-in infrared illumination approach.
- Combination of mid-wave infrared (MWIR) illumination with lock-in synchronization.
- Validation through defect localization in Gallium Arsenide (GaAs) nano-ridge lasers.
Main Results:
- Significant improvement in IR image contrast.
- Enhanced resolving capability for microscopic thermal imaging.
- Effective suppression of image noise.
- Successful demonstration of defect localization in GaAs nano-ridge lasers.
Conclusions:
- The proposed lock-in infrared illumination method effectively enhances IR image quality for microscopic applications.
- This in-situ, non-contact approach offers practical advantages over existing contrast enhancement techniques.
- The method is readily integrable into existing thermal imaging systems.
