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Tunable liquid crystal-resonant grating filters using superimposed grating structures fabricated by nanoimprint lithography

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6 Author(s)
Chang, Allan S.P. ; Dept. of Electr. Eng., Princeton Univ., NJ, USA ; Morton, Keith J. ; Murphy, P. ; Tan, Hua
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Demonstration of superimposing a short-pitch gratings for aligning liquid crystals onto a larger-pitch subwavelength resonant grating (SRG) is presented, to achieve superior liquid crystal alignment, which leads to drastically improved tuning filter performance and tuning range. The tunable SRG needs a 1 μm pitch gratings for the desired filter resonance frequency, which is in the infrared, and a-shallower gratings with a pitch between 200 nm to 400 nm for aligning liquid crystal, which is used for tuning the resonance frequency of the filter. A tuning range of 21 nm has been achieved.

Published in:

Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE  (Volume:1 )

Date of Conference:

7-11 Nov. 2004