Design of Wide Band Tunable Birefringent Filters with Liquid Crystals Academic Article uri icon

abstract

  • We demonstrate LC tunable filters designed for integration into biomedical optical imaging systems and can be utilized to many other areas. Two types of tunable filters with wide dynamic range are presented based on a stack of birefringent plates similar to Lyot based configuration. Modification of sets of Lyot filters controlled by different sets of external electric field allowed us to eliminate unwanted orders. In a different approach integration of an additional thin liquid crystal cell (retarder) between crossed polarizers to eliminate one order of the Lyot filter. Another configuration proposed uses a sequence of retarders each between crossed polarizers but with increasing thickness following an arithmetic sequence.

publication date

  • January 1, 2009