Mode-mismatched photothermal lens-based trace furfural detection using a quantum cascade laser as excitation source

Key Points

• The method enables highly sensitive trace detection of furfural, a potential food contaminant.
• Furfural was detected at low concentrations, highlighting the method’s effectiveness in real-time monitoring.
• Analysis using a photothermal lens technique shows promising results for this approach.
• This method may facilitate better safety measures in food industries, needing further validation in diverse settings.