Tunable electrochromic filter for in situ Fourier spatial frequency filtering.

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Spatial optical Fourier filtering is crucial for in situ image and light field processing.
• Conventional filters offer limited, inflexible control due to fixed patterns or mechanical irises.

Purpose of the Study:

• To introduce novel electrochromic spatial filters with individually addressable and continuously tunable segments.
• To demonstrate a new fabrication process for seamless electrochromic segments.
• To showcase the application of these filters in optical Fourier transform setups.

Main Methods:

• Fabrication of electrochromic devices with ring-shaped or directional segments.
• Development of a novel process to create seamless, gap-free electrochromic segments.
• Integration and testing of the filters in an optical Fourier transform system.

Main Results:

• Two types of electrochromic spatial filters (ring-shaped and directional) were successfully realized.
• Filters allow individually addressed and continuously tuned transmission, offering up to 512 distinct filtering states.
• A novel fabrication technique overcame challenges in creating gap-free electrochromic segments.

Conclusions:

• The developed electrochromic spatial filters provide flexible and precise control for optical Fourier filtering.
• The novel fabrication method enables high-performance, seamless electrochromic filter segments.
• These filters represent a significant advancement for in situ image and light field processing applications.