Thermal Lens Spectroscopy Applications in Material Analysis
Summary
Thermal lens spectroscopy (TLS) utilises the heat generated by a focused excitation laser to create a transient refractive index gradient in a sample, effectively forming a “thermal lens” that alters the path of a probe beam. By monitoring beam deflection, phase shifts or diffraction patterns, TLS provides highly sensitive measurements of thermal diffusivity, optical absorption coefficients and local composition. The noninvasive nature of the technique, coupled with its adaptability to liquids, polymers, semiconductors and nanoparticle suspensions, has led to widespread adoption for materials characterisation. Integrations with microfluidic flow-injection systems and interferometric detection have enhanced throughput and spatial resolution, enabling applications in environmental monitoring, quality control of advanced materials and rapid screening of chemical processes across research and industry.
Research from Nature Portfolio
Recent studies have demonstrated a photothermal-induced diffraction technique in which femtosecond infrared excitation produces local refractive index changes in hydrogen-bonded and organic liquids. The resulting diffraction patterns of a white-light probe beam serve as unique optical fingerprints, allowing noninvasive identification of complex mixtures. Implementation on compact platforms using supercontinuum sources and digital cameras enables real-time classification of solvents and binary blends, heralding portable TLS instruments for chemical and bioanalytical applications.
Thermal Lens Spectroscopy Applications in Material Analysis publication trend
The graph below shows the total number of articles in thermal lens spectroscopy applications in material analysis across all publications each year (not limited to Nature Index journals).
Technical terms
Thermal lensing: Localised refractive index change induced by non-uniform heating, causing a lens-like effect in the medium.
Mode-mismatched dual-beam configuration: An arrangement where excitation and probe beams are focused differently to enhance sensitivity to thermal gradients.
Thermal diffusivity: A parameter describing the rate at which heat propagates through a material, extracted from the transient thermal lens response.
Flow-injection analysis: A microfluidic technique for automated sample introduction and mixing, enabling high-throughput spectroscopic detection.
References
- Unveiling the properties of liquids via photothermal-induced diffraction patterns. Communications Physics (2023).
- Recent Progress and Applications of Thermal Lens Spectrometry and Photothermal Beam Deflection Techniques in Environmental Sensing. Sensors (2023).
- Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry. Nanomaterials (2023).
- Thermal lensing approach based on parabolic approximation and Mach-Zehnder interferometer. Heliyon (2023).
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