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Effects of submicrometer-sized particles on microdroplet lasing
Optics Letters
|October 6, 2009
Summary
Adding latex particles to Rhodamine 6G dye microdroplets suppresses lasing. Lasing stops at a specific latex surface area, regardless of particle size, possibly due to Förster-assisted annihilation.
Area of Science:
- Optics and Photonics
- Materials Science
- Physical Chemistry
Background:
- Microdroplet lasers offer unique optical properties.
- Rhodamine 6G is a common laser dye.
- Polystyrene latex spheres are used as model particles.
Purpose of the Study:
- Investigate the effect of latex particles on lasing in Rhodamine 6G microdroplets.
- Determine the threshold characteristics of lasing emission.
- Explore the mechanism behind lasing suppression.
Main Methods:
- Fabrication of Rhodamine 6G/ethanol microdroplets containing polystyrene latex spheres.
- Optical pumping experiments to induce and measure lasing.
- Analysis of threshold pump intensity and emission characteristics.
Main Results:
- Latex particles were found to suppress lasing in Rhodamine 6G microdroplets.
- Lasing ceased at a critical total latex particle surface area, independent of individual particle size.
- A Förster-assisted annihilation mechanism is proposed to explain the observed suppression.
Conclusions:
- The surface area of latex particles, not their size, is critical for suppressing lasing.
- Dye molecule adsorption onto latex surfaces likely facilitates energy transfer and annihilation.
- Findings provide insights into controlling and optimizing microdroplet laser performance.
