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 /spl mu/m 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.
Tunable liquid crystal-resonant grating filters using superimposed grating structures fabricated by nanoimprint lithography
2004-01-01
106842 byte
Conference paper
Electronic Resource
English
British Library Conference Proceedings | 2004
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