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Picosecond time scale modification of forward scattered light induced by absorption inside particles
Myriam Kervella1, Françoix-Xavier d'Abzac, François Hache
1Departement of theorical and applied optics, ONERA, 31055 Toulouse cedex, France.
Optics Express
|January 26, 2012
Summary
Absorption within particles decreases light’s Time Of Flight (TOF) on a picosecond scale. This measurable effect, sensitive to the absorption coefficient, offers a new method for quantifying particle absorption using femtosecond laser systems.
Area of Science:
- Optics
- Photonics
- Materials Science
Background:
- Understanding light propagation in scattering media is crucial for various applications.
- Absorption significantly impacts light-matter interactions within dense materials.
- Accurate measurement of absorption coefficients is essential for material characterization.
Purpose of the Study:
- To investigate how absorption processes affect the Time Of Flight (TOF) of forward-scattered light.
- To determine the feasibility of measuring particle absorption coefficients via TOF analysis.
Main Methods:
- Utilized Monte Carlo simulations incorporating temporal phase functions.
- Employed Debye models to represent particle scattering properties.
- Simulated light scattering in thick media with varying absorption levels.
Main Results:
- Particle absorption was found to induce a decrease in the TOF of scattered light.
- This TOF decrease occurs on a picosecond timescale, detectable with femtosecond laser setups.
- The magnitude of the TOF reduction shows high sensitivity to the particle absorption coefficient.
Conclusions:
- Absorption within particles demonstrably alters the TOF of forward-scattered light.
- The observed sensitivity provides a promising optical method for measuring absorption coefficients.
- This technique offers a novel, efficient approach for characterizing absorbing particles.
