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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Reconfigurable Liquid Whispering Gallery Mode Microlasers.

Shancheng Yang1, Van Duong Ta1,2, Yue Wang1

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Link, 637371, Singapore.

Scientific Reports
|June 4, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel all-liquid tunable laser using inkjet printing. This microcavity laser can be reconfigured by altering surface tension, enabling sensitive detection of water-soluble compounds.

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Area of Science:

  • Photonics and Optical Engineering
  • Microfluidics and Lab-on-a-Chip Technologies
  • Sensing and Detection Systems

Background:

  • Engineering reconfigurable liquid-based photonic devices presents significant challenges due to fluid dynamics.
  • Tunable optical micro-devices are highly desirable for advanced applications but difficult to achieve with liquid media.

Purpose of the Study:

  • To demonstrate an all-liquid tunable whispering gallery mode microlaser fabricated using inkjet printing.
  • To investigate the reconfigurable tuning of laser cavity resonance via surface tension manipulation.
  • To explore the application of this liquid laser for sensing water-soluble organic compounds.

Main Methods:

  • Fabrication of an all-liquid microlaser floating on a liquid surface using inkjet printing.
  • Manipulation of surface tension in the supporting liquid by altering surfactant concentration.
  • Measurement of cavity resonance shifts and sensing performance.

Main Results:

  • Successful demonstration of an all-liquid tunable whispering gallery mode microlaser.
  • Reconfigurable tuning of laser cavity resonance achieved by modifying surface tension.
  • High sensitivity achieved for sensing water-soluble organic compounds (19.85 THz/(mol·mL⁻¹)) with a low detection limit (5.56 × 10⁻³ mol·mL⁻¹).

Conclusions:

  • The study presents a novel method for effectively tuning a laser resonator using surface tension.
  • The developed liquid laser offers a promising platform for sensitive biological, chemical, and environmental sensing.
  • This work opens new avenues for engineering reconfigurable liquid-based photonic devices.