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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
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Reconfigurable Integrated Optofluidic Droplet Laser Arrays.

Han Zhang1, Prithviraj Palit1, Yonghao Liu1

  • 1Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019, United States.

ACS Applied Materials & Interfaces
|May 22, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed an optofluidic droplet laser array on a silicon chip. This miniaturized coherent light source enables on-demand droplet generation and characterization for advanced sensing applications.

Keywords:
droplet lasersdye laserslaser arrayoptofluidicswhispering gallery mode

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Area of Science:

  • Optofluidics
  • Photonics
  • Microfluidics

Background:

  • Optofluidic lasers offer miniaturized light sources but are limited by single-cavity operation.
  • This limitation restricts applications in high-throughput sensing and on-chip spectroscopy.

Purpose of the Study:

  • To demonstrate an optofluidic droplet laser array on a silicon chip.
  • To enable on-demand generation, removal, and regeneration of multiple droplet optical cavities.

Main Methods:

  • Fabrication of a silicon chip with integrated microfluidics and a 2x2 nozzle array.
  • Generation and control of optofluidic droplet arrays with diameters from 115 to 475 μm.
  • Development of an image-based method for simultaneous lasing threshold analysis.

Main Results:

  • Successful demonstration of an optofluidic droplet laser array.
  • Droplet laser array lasing thresholds ranged from 0.63 to 2.02 μJ/mm².
  • Image-based threshold analysis yielded consistent results compared to spectrum-based methods.

Conclusions:

  • The optofluidic droplet laser array is a promising technology for integrated coherent light sources.
  • This technology facilitates cost-effective, on-chip solutions for point-of-care applications.
  • The developed methods enable efficient characterization of multi-cavity optofluidic laser systems.