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Enabling High Precision Gradient Index Control in Subsurface Multiphoton Lithography.

Alexander J Littlefield1,2, Dajie Xie3,4,5, Corey A Richards3,4,5

  • 1Department of Electrical and Computer Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.

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|September 25, 2023
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Summary
This summary is machine-generated.

Researchers improved subsurface micro-optics fabrication using multiphoton lithography. This new method significantly enhances refractive index uniformity and range for 3D optical components, enabling more precise and reliable optical device creation.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Multiphoton lithography in mesoporous hosts enables 3D optical component fabrication with tunable refractive indices.
  • Previous methods were limited by sensitivity near the photoresist threshold, restricting the achievable refractive index range and uniformity.

Purpose of the Study:

  • To enhance the uniformity and expand the reliable refractive index range for subsurface micro-optics fabricated via multiphoton lithography.
  • To overcome limitations of prior techniques sensitive to exposure doses near the photoresist threshold.

Main Methods:

  • Implemented three key modifications: calibrating galvanometer write fields, employing piezo-galvo dithering, and enforcing constant time between lateral cross-sections.
  • These techniques address large-scale optical aberrations, small-scale writing errors, and variations across writing depths.
  • Utilized a mesoporous silica host for fabricating optical components with precisely controlled refractive indices.

Main Results:

  • Significantly increased the reliable refractive index range from 0.12 to 0.37, with a standard deviation (SD) at threshold reduced from 0.13 to 0.0021.
  • Achieved accurate fabrication of optics with indices from n = 1.20 to 1.57 (SD < 0.012) within porous silica.
  • Demonstrated improved performance of fabricated 2D line gratings and gradient index lenses compared to controls.

Conclusions:

  • The developed multiphoton lithography method offers unprecedented control over refractive index uniformity and range in 3D micro-optics.
  • This advancement enables the precise fabrication of advanced optical components with enhanced performance characteristics.
  • The improved technique has broad implications for creating sophisticated optical devices and systems.