Defect assisted subwavelength resolution in III–V semiconductor photonic crystal flat lenses with n = −1

We propose a III–V semiconductor photonic crystal slab designed to operate as a n = −1 superlens at λ0 = 1.55 μm. The structure consists of air holes arranged in a two-dimensional triangular lattice, of period a, nanopatterned in an InP/InGaAsP/InP slab. Exploiting the second pass-band regime (a/λ0 ∼ 0.31), subwavelength resolutions as low as 0.38λ0 for planar lenses have been obtained by the insertion of hexagonal nanocavities within the crystal.