The authors report the first realisation of a two-dimensional photonic bandgap structure with a period of λ0/2n in the GaAs/AlGaAs material system. The structure consists of a honeycomb lattice with a wall thickness of ~30 nm and a period of 160 nm. It was found that, to realise patterns of such small size and periodicity, it is crucial to control the shape of the exposed features.
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Krauss et al. (1994) studied this question.
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