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Opto-fluidic ring resonator lasers based on highly efficient resonant energy transfer
Optics Express
|June 25, 2009
Summary
Researchers developed a novel opto-fluidic ring resonator dye laser. This laser utilizes efficient fluorescence resonant energy transfer (FRET) for low-threshold lasing, enabling new possibilities for microfluidic devices and sensing applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Chemical Physics
Background:
- Whispering gallery mode (WGM) resonators offer high quality factors for enhanced light-matter interactions.
- Fluorescence resonant energy transfer (FRET) is a key mechanism for energy transfer between molecules.
Purpose of the Study:
- To demonstrate an opto-fluidic ring resonator dye laser with efficient energy transfer.
- To achieve low lasing thresholds in microfluidic laser systems.
- To explore FRET mechanisms for laser applications and sensing.
Main Methods:
- Fabrication of a fused silica capillary ring resonator supporting WGMs.
- Utilizing a donor-acceptor dye mixture as the active lasing medium.
- Investigating non-radiative Förster transfer as the dominant energy transfer mechanism.
Main Results:
- Achieved high Q-factors (>107) in the fused silica capillary resonator.
- Demonstrated a low lasing threshold of 0.3 μJ/mm² for the acceptor dye.
- Confirmed non-radiative Förster transfer as the primary mechanism for acceptor lasing.
- Presented FRET lasers with cascade energy transfer and quantum dot donors.
Conclusions:
- The developed opto-fluidic laser exhibits low thresholds and flexible excitation/emission properties.
- This technology paves the way for novel microfluidic lasers.
- Opens avenues for in-situ laser intra-cavity bio/chemical sensing applications.
