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Development of large diameter nanostructured GRIN microlenses enhanced with temperature-controlled diffusion
Optics Express
|December 28, 2019
Summary
We developed gradient index (GRIN) microlenses using nanostructurization and diffusion. This method overcomes effective medium theory limits, enabling novel optical element fabrication for wavelengths over 658 nm.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Gradient index (GRIN) components offer tunable refractive index profiles with flat facets.
- Fabrication traditionally requires subwavelength nanorod assembly, limiting component size per effective medium theory.
Purpose of the Study:
- To develop a novel fabrication method for nanostructured GRIN microlenses.
- To overcome the size limitations imposed by the effective medium theory in GRIN component fabrication.
Main Methods:
- Combines nanostructurization of a preform with a controlled diffusion process during fiber drawing.
- Utilizes high temperatures during fiber drawing to dissolve nanorods and achieve quasi-uniform glass distribution.
Main Results:
- Successfully fabricated a 115 µm diameter nGRIN microlens with a 200 µm length.
- Demonstrated feasibility for operation at wavelengths over 658 nm.
- Overcame effective medium theory limitations regarding nanorod size.
Conclusions:
- The proposed fabrication method enables the creation of GRIN microlenses beyond effective medium theory constraints.
- This approach offers a viable pathway for producing advanced optical elements with tailored refractive indices.
