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Optofluidic passive parity-time-symmetric systems.

Franck Assogba Onanga1, Hengky Chandrahalim1

  • 1Department of Electrical and Computer Engineering, Air Force Institute of Technology, Wright-Patterson Air Force Base, OH 45433, USA.

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|February 1, 2024
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Summary

This study presents a new liquid-based method for creating parity-time (PT)-symmetric optical waveguides. This approach simplifies manufacturing, enabling cost-effective, large-scale production of PT-symmetric optofluidic systems.

Keywords:
exceptional pointsmicrosystemsoptical waveguidesoptofluidicsparity-time symmetry

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microfluidics

Background:

  • Parity-time (PT)-symmetric systems offer potential for advanced sensors and signal processors.
  • Achieving PT-symmetry in optics typically requires precise, sub-wavelength waveguide coupling.
  • Current fabrication methods like electron beam lithography are costly and slow for mass production.

Purpose of the Study:

  • To introduce a novel liquid-assisted fabrication method for PT-symmetric optical waveguides.
  • To demonstrate a practical fabrication process for optofluidic PT-symmetric systems.
  • To overcome the manufacturing challenges associated with traditional PT-symmetric optical systems.

Main Methods:

  • Harnessing dynamic liquid flow between optical waveguides to achieve evanescent coupling.
  • Designing microscale platforms for integrated optofluidic systems.
  • Proposing a fabrication process compatible with standard photolithography.

Main Results:

  • Attained evanescent wave coupling with gap dimensions suitable for photolithography.
  • Developed a feasible fabrication process flow for the proposed optofluidic system.
  • Enabled dynamic control over waveguide coupling through liquid manipulation.

Conclusions:

  • The liquid-assisted method significantly reduces manufacturing complexity and cost for PT-symmetric optical systems.
  • This technique paves the way for rapid, large-scale production of PT-symmetric optofluidic devices.
  • The developed approach bridges the gap between theoretical PT-symmetry concepts and practical implementation.