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Quantifying local stiffness and forces in soft biological tissues using droplet optical microcavities
Gregor Pirnat1,2, Matevž Marinčič1,2, Miha Ravnik1,2
1Condensed Matter Department, J. Stefan Institute, Ljubljana SI-1000, Slovenia.
Summary
This study introduces a novel microscale method to measure the mechanical properties of biological tissues using optical resonances in droplet microcavities. The technique precisely quantifies local stress and Young's modulus, offering new insights into tissue mechanics.
Area of Science:
- Biophysics
- Materials Science
- Optical Engineering
Background:
- Mechanical properties of biological tissues are crucial for understanding biological processes.
- Microscale, noncontact methods are needed for precise mechanical analysis of tissues.
Purpose of the Study:
- To develop a microscale method for quantifying local mechanical properties of biological materials.
- To enable precise measurements of stress and Young's modulus in soft tissues.
Main Methods:
- Utilizing droplet microcavities to measure spectral shifts of optical resonances.
- Quantifying deformations in dye-doped oil droplets embedded in tissues with nanometer precision.
- Applying external strain to measure Young's modulus across a wide range.
Main Results:
- Achieved deformation measurement error of only 1 nm.
- Enabled measurement of anisotropic stress as low as a few pN/μm².
- Measured Young's modulus in the range of 1 Pa to 35 kPa, covering most human soft tissues.
Conclusions:
- The developed method provides a powerful tool for microscale mechanical characterization of biological tissues.
- Potential applications include mapping stiffness in inhomogeneous tissues and in vivo/single-cell experiments.
- This approach can yield significant insights into the mechanics of biological systems.
