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Multi-color lasing in chemically open droplet cavities.

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Researchers developed multicolor lasing in microfluidic droplets using FRET. This technique allows for online color switching, enabling sequential detection of molecules with tunable laser emission.

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Area of Science:

  • Optics and Photonics
  • Microfluidics
  • Biophotonics

Background:

  • Whispering gallery mode (WGM) optical cavities are crucial for laser development.
  • Microfluidic droplets offer unique platforms for optical experiments.
  • Förster Resonance Energy Transfer (FRET) enables energy transfer between molecules.

Purpose of the Study:

  • To demonstrate FRET-based multicolor lasing in open microfluidic droplet cavities.
  • To enable online modulation of gain medium composition for tunable laser output.
  • To showcase sequential detection of molecules using multicolor laser emission.

Main Methods:

  • Generated monodisperse microfluidic droplets containing coumarin 102 (donor dye).
  • Utilized droplets as WGM optical cavities for lasing at ~470 nm.
  • Introduced rhodamine 6G (acceptor dye) to switch lasing color to ~590 nm via FRET.

Main Results:

  • Achieved stable lasing from coumarin 102 in droplet cavities.
  • Successfully switched lasing color from blue to orange by introducing rhodamine 6G.
  • Demonstrated sequential detection of FITC-Dextran and methylene blue using the tunable lasers.

Conclusions:

  • Chemically open droplet cavities allow online modulation for multicolor lasing.
  • FRET-based color switching in microfluidic lasers enables versatile applications.
  • The method provides a simple platform for spectral range extension and molecular detection.