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Subwavelength far-field resolution in a square two-dimensional photonic crystal
Phys. Rev. E 71, 037601 – Published 16 March, 2005
DOI: https://doi.org/10.1103/PhysRevE.71.037601
Abstract
It has been suggested that a subwavelength image can be realized by a photonic crystal slab with a square lattice in the lowest band. However, due to the anisotropy of dispersion in such a photonic structure, the image only appears in the near-field region. In this paper, we show that subwavelength far-field focusing and imaging, explicitly following the well-known wave-beam negative refraction law with relative refractive index of , can also be realized by a square photonic crystal through choosing suitable scatterers for the lowest valence band.
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