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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
Published on: December 5, 2025
Laser reflectometry of submegahertz liquid meniscus ringing.
R H Farahi1, A Passian, Y K Jones
1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. farahirh@ornl.gov
Optics Letters
|October 20, 2009
Summary
We analyzed meniscus oscillations in piezoelectric microjets using laser reflectometry. This study reveals insights into fluid properties and droplet formation dynamics for better control.
Area of Science:
- Physics
- Fluid Dynamics
- Optical Science
Background:
- Nondestructive optical probing of interfacial dynamics is crucial for applications like ellipsometry and all-optical switching.
- Understanding microjet droplet formation is vital for controlling volume, uniformity, velocity, and rate.
- Meniscus ringing and relaxation time after droplet breakoff influence subsequent drop formation and indicate fluid properties.
Purpose of the Study:
- To analyze meniscus oscillations in a piezoelectric microjet orifice.
- To investigate the relationship between meniscus dynamics and fluid properties.
- To provide insights into droplet formation control in microfluidic systems.
Main Methods:
- Utilized laser reflectometry for non-destructive probing.
- Focused on the analysis of meniscus oscillations.
- Employed a piezoelectric microjet system.
Main Results:
- Presented a detailed analysis of meniscus oscillations.
- Characterized the ringing and relaxation dynamics of the meniscus.
- Established a link between oscillation patterns and fluid properties.
Conclusions:
- Laser reflectometry is effective for studying interfacial dynamics in microjets.
- Meniscus oscillation analysis provides valuable data on fluid physical properties.
- Findings contribute to improved control over microjet droplet formation.
