Radial IR-GRIN lens prepared by multi-temperature fields manipulated gradient crystallization within chalcogenide...

Area of Science:

• Materials Science
• Optical Engineering
• Nanotechnology

Background:

• Chalcogenide glasses are established for axial IR-GRIN lenses.
• Radial IR-GRIN lenses are optically advantageous but less studied.
• Existing methods for radial GRIN lenses are limited.

Purpose of the Study:

• To develop a novel method for preparing radial-type IR-GRIN lenses.
• To create a gradient refractive index profile in chalcogenide glass.
• To demonstrate the potential for large-scale production of these lenses.

Main Methods:

• Fabrication of a 65GeS2-25In2S3-10CsCl (GIC) glass matrix.
• Introduction of indium sulfide (In2S3) nanocrystals.
• Application of multi-temperature field manipulation for controlled crystallization.

Main Results:

• Achieved central crystallization with gradient attenuation towards the edge in GIC glass.
• Generated a radial GRIN profile with a refractive index change (Δn) exceeding 0.1.
• Maintained excellent infrared transparency in the prepared samples.
• Confirmed radial gradient crystallization indirectly via Raman intensity analysis.

Conclusions:

• The new method successfully produces radial IR-GRIN lenses with tunable refractive indices.
• The process demonstrates excellent reproducibility and scalability for industrial applications.
• This advancement opens new possibilities for designing advanced infrared optical systems.