Diamond symmetry structures (space group No. 227) with tunable lattice size are fabricated from epoxy-functionalized cyclohexyl polyhedral oligomeric silsesquioxane (POSS) by holographic lithography using dual-beam quadruple exposure configuration with careful consideration of the relative phase shift, wobble effect, and pre-compensation of the photoresist shrinkage. Calculation suggests that Si photonic crystals templated from the POSS structures, both directly converted and its inverse structure, offer the same and maximum complete PBGs in comparison to other holographically patterned diamond lattices.
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Zhu et al. (2010) studied this question.
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