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Optofluidic gradient refractive index resonators using liquid diffusion for tunable unidirectional emission.

H L Liu1, Y F Zuo, X Q Zhu

  • 1School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. yangyiys@whu.edu.cn.

Lab on a Chip
|June 25, 2020
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Summary
This summary is machine-generated.

Researchers developed a novel gradient-index resonator using liquid diffusion, enabling tunable unidirectional light emission. This breakthrough in optofluidic resonators offers potential for advanced light sources and sensing applications.

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Area of Science:

  • Optofluidics
  • Nanophotonics
  • Materials Science

Background:

  • Optofluidic resonators are crucial for biochemical detection and microscale lasers, leveraging unique liquid environments.
  • Liquid diffusion is vital for optofluidic applications like gradient refractive index lenses but remains unexplored in resonators.
  • Achieving unidirectional emission in conventional circular resonators is challenging.

Purpose of the Study:

  • To introduce a gradient refractive index profile formed by liquid diffusion in annular channels into a circular resonator.
  • To create a novel gradient-index resonator with tunable unidirectional emission.
  • To explore the potential of this new resonator for sensing and light source applications.

Main Methods:

  • Utilized liquid diffusion to create a gradient refractive index profile within annular channels of a circular resonator.
  • Conducted simulations and experiments to analyze light intensity profiles and emission characteristics.
  • Investigated the influence of refractive index difference, channel dimensions, and working wavelengths on emission.

Main Results:

  • Successfully obtained a squeezed, non-rotationally symmetrical light intensity profile in the circular resonator.
  • Demonstrated tunable unidirectional emission, a significant improvement over conventional resonators.
  • Observed a squeezed light coefficient of approximately 1.8 with a 100 μm bending radius, resulting in a narrow 14-degree emission divergence angle.

Conclusions:

  • The novel liquid gradient refractive index resonator provides a practical approach for optofluidic resonator emission.
  • The squeezed light profile enables efficient unidirectional emission, suitable for future laser applications.
  • This resonator shows significant potential for optofluidic sensing applications.