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Long-lived monolithic micro-optics for multispectral GRIN applications.

Antoine Lepicard1,2, Flavie Bondu1, Myungkoo Kang2

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This summary is machine-generated.

Researchers created stable, near-surface micro-optic elements in glass for dual-band applications. This method uses controlled ion migration to create permanent refractive index changes, offering new design possibilities for optical devices.

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Area of Science:

  • Materials Science
  • Optics
  • Glass Science

Background:

  • Developing stable, monolithic micro-optic elements for dual-band applications (visible and infrared) is challenging.
  • Existing refractive index modification techniques often lack long-term stability or design flexibility.

Purpose of the Study:

  • To demonstrate the creation of robust, near-surface refractive micro-optic elements with long-lived stability in glass.
  • To explore the universality of the fabrication approach across different glass types.

Main Methods:

  • Utilized thermally-poling of glass with controlled mobile ion migration guided by electrode patterning.
  • Characterized sub-surface compositional and structural modifications and resulting refractive index profiles.
  • Applied the technique to both oxide (visible-near infrared [NIR]) and chalcogenide (NIR-midwave infrared [MIR]) glasses.

Main Results:

  • Fabricated flat, permanent micro-optic structures with stable, spatially-varying refractive index profiles (Δn up to 5 × 10-2).
  • Demonstrated stability of induced refractive index changes for over 15 months.
  • Showcased the versatility of the approach for various element sizes, shapes, and gradient profiles.

Conclusions:

  • Established a novel method for producing stable, monolithic micro-optics in glass using thermally-induced ion migration.
  • Confirmed the broad applicability of this technique to diverse glass materials for dual-band optical systems.
  • Highlighted the potential for advanced optical element design through precise control of refractive index profiles.