Fabrication, Design and Application of High Resolution Patterned Polarization Filter

Case ID:
UA20-138
Invention:

This invention describes achromatic polarization filters that can be integrated with a complementary metal–oxide–semiconductor (CMOS) and charge-coupled device (CCD) detector array to form a polarization camera. The proposed variants of pixelated polarization filters would have applications in display and sensor designs and could cover light sources, such as organic light emitting diodes or liquid crystal light panel, to form a polarization display which can display an image of arbitrary polarization states.

This is a patent-dense area, and the novelty in this invention is that the polarization camera design is perfectly achromatic for measurement of linear polarization state and the process reduces the transition region between pixels.

Background:
For many applications, there is a need to create an array of polarization filters with well-defined shape and orientation. For existing CMOS and CCD optical sensor arrays, the size of the pixel can be of the order of one micron or smaller. There is a need to create patterned polarization filters that have the same dimension and shape as the pixel. The current problem in practice, is a transition region between regions of one alignment angle and an adjacent region of an alternate alignment angle. This can range from 0.5 to 5 microns and limits the spatial resolution of the patterns in the polarization filter. The disclosed research provides a fabrication technique that can reduce and/or remove the limiting transition regions.

Applications:

  • Cameras
  • Image sensors
  • CMOS and CCD

Advantages:

  • More effective
  • Dimensions less than 5 microns
  • Smaller size pixels and number of pixels
Patent Information:
Contact For More Information:
Kennedy Nyairo
Sr. Licensing Manager, Optical Sciences
The University of Arizona
knyairo@email.arizona.edu
Lead Inventor(s):
Stanley Pau
Xingzhou Tu
Keywords: