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Transmission spectra of the grating samples, (a) NVP sample; (b) acetone sample without removing cover slide; and (c) the same sample as (b) but acetone was evaporated by removing the cover slide. The ratio of acetone: LC: photopolymer was 20:20:60 by weight percentage.
LVSEM and BFTEM (inset) images of the grating structure of the acetone sample.
Index mismatch vs the average refractive index of the grating, where , , , and .
The spectra of the acetone sample obtained after backfilling with different materials (a) air voids (b) acetone, (c) chloroform , and (d) toluene .
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