Tunable optical filter having a large dynamic range

Tunable optical filter having a large dynamic range

A novel (to our knowledge) concept for a tunable birefringent filter with a high dynamic range is proposed and demonstrated by using a stack of liquid-crystal retarders having different thicknesses following an arithmetic sequence. Each retarder is between crossed polarizers with its optic axis orie...

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Bibliographic Details
Published in:Optics letters Vol. 34; no. 14; p. 2114
Main Authors: Aharon, Ofir, Abdulhalim, I
Format: Journal Article
Language:English
Published: United States 15-07-2009
Subjects:
Equipment Design
Equipment Failure Analysis
Liquid Crystals
Optical Devices
Refractometry - instrumentation
Reproducibility of Results
Sensitivity and Specificity
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Summary:A novel (to our knowledge) concept for a tunable birefringent filter with a high dynamic range is proposed and demonstrated by using a stack of liquid-crystal retarders having different thicknesses following an arithmetic sequence. Each retarder is between crossed polarizers with its optic axis oriented azimuthally at 45 degrees to the polarizer axis. The tunable filter was fabricated by using nematic liquid crystals demonstrating tunability over a range of 800 nm, covering the visible and the near IR; hence it has a potential for use in biomedical optical imaging applications.
ISSN:0146-9592
DOI:10.1364/OL.34.002114