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High-Density μLED-Based Optical Cochlear Implant With Improved Thermomechanical Behavior.

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|October 18, 2018
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Summary

Researchers developed a novel optical cochlear implant (oCI) using a single epoxy material, significantly reducing thermomechanical bending for enhanced optogenetic experiments. This new design offers improved stability and performance for auditory research.

Keywords:
cochlear implantepoxymicro light-emitting diode (μLED)optogeneticsthermomechanical behavior

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • Traditional cochlear implants stimulate the auditory nerve electrically.
  • Optogenetics offers a more precise method for neural stimulation but requires light delivery.
  • Previous optical cochlear implant (oCI) designs faced challenges with thermomechanical bending.

Purpose of the Study:

  • To realize an optical cochlear implant (oCI) with optimized thermomechanical properties.
  • To improve probe stability and reduce bending for effective optogenetic stimulation.
  • To enhance material integration and adhesion for long-term device reliability.

Main Methods:

  • Fabrication of a 144-micro-light-emitting diode (μLED) oCI probe using a single, transparent epoxy material.
  • Development of a spin-coating process for precise epoxy layer deposition (down to 5 μm).
  • Investigation of metallization and adhesion layers, identifying SiC/Ti for superior epoxy adhesion.
  • Implementation of a stress-free release method using sacrificial aluminum layer dissolution.

Main Results:

  • The single-epoxy oCI probe exhibited significantly reduced thermomechanical bending and negligible hysteresis compared to previous designs.
  • Optimized spin-coating achieved thin epoxy layers (<7% thickness variation).
  • Silicon carbide with titanium metallization improved epoxy adhesion by a factor of two.
  • The oCI probe demonstrated a temperature increase limited to 1 K at 10 mA μLED current.
  • Optical output power reached 0.82 mW (462 nm wavelength) with a radiant emittance of 407 mW/mm², suitable for optogenetics.

Conclusions:

  • A novel oCI probe utilizing a single epoxy material overcomes thermomechanical instability issues.
  • The optimized fabrication process and material selection ensure high performance and reliability.
  • This advanced oCI is well-suited for future optogenetic experiments in auditory research.