Photonic crystals made of macroporous silicon and liquid crystals are optical materials with a tunable dispersion relation in the infrared frequency range. Three-dimensional structures can be realized by manufacturing a two-dimensional array of pores that show a spatially periodic variation of the pore diameter. The director fields of cholesteric liquid crystals confined to such modulated pores show different topologies that depend essentially on the ratio between the helix pitch of the liquid crystal and the pore size.
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Heinrich et al. (2007) studied this question.
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