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Quantum cascade lasers (QCLs) in biomedical spectroscopy.

Andreas Schwaighofer¹, Markus Brandstetter, Bernhard Lendl

¹Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164, 1060 Vienna, Austria. Bernhard.Lendl@tuwien.ac.at.

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Summary

Quantum cascade lasers (QCLs) enable advanced mid-infrared spectroscopy for rapid, label-free biomedical analysis. These lasers offer new possibilities for portable diagnostic devices and clinical quantification.

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Area of Science:

Optoelectronics
Spectroscopy
Biomedical Engineering

Background:

Quantum cascade lasers (QCLs) are room-temperature semiconductor sources for mid-infrared (mid-IR) light.
Mid-IR spectroscopy offers rapid, label-free, and objective analysis crucial for biomedical applications.
QCLs present novel opportunities for developing advanced analytical methods in medical diagnostics.

Purpose of the Study:

To review the characteristics of QCLs and their advantages for biomedical analysis.
To summarize recent applications of QCL-based spectroscopy in analyzing clinical samples.
To discuss future prospects for QCL devices in diagnostics.

Main Methods:

Review of QCL technology and mid-IR spectroscopy principles.
Compilation and summary of existing literature on QCL applications in biomedical analysis.
Analysis of QCL performance compared to traditional methods like FTIR spectroscopy.

Main Results:

QCLs facilitate the development of miniaturized and portable mid-IR spectroscopic instrumentation.
QCL-based spectroscopy enables quantification of clinically relevant analyte concentrations.
Successful applications demonstrated for analyzing breath, urine, blood, interstitial fluid, and biopsy samples.

Conclusions:

QCLs are a significant advancement for mid-IR spectroscopy in biomedical analysis.
QCL-based devices hold potential for routine and point-of-care diagnostic applications.
Further technical advancements will expand the utility of QCLs in clinical settings.