Influence of source displacement on the features of subwavelength imaging of a photonic crystal slab

In this paper we study the characteristics of subwavelength imaging of a photonic crystal (PhC) superlens under the influence of source displacement. For square and triangular lattice photonic crystal lenses, we investigate the influence of changing the lateral position of a single point source on i...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-01, Vol.23 (3), p.035301-5
Main Authors: Luan, Pi-Gang, Chiang, Chen-Yu, Yeh, Hsiao-Yu
Format: Article
Language:English
Subjects:
Condensed matter
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Imaging
Lenses
Optical materials
Optics
Photonic bandgap materials
Photonic crystals
Physics
Pollution sources
Slabs
Stability
Variability
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Summary:In this paper we study the characteristics of subwavelength imaging of a photonic crystal (PhC) superlens under the influence of source displacement. For square and triangular lattice photonic crystal lenses, we investigate the influence of changing the lateral position of a single point source on imaging uniformity and stability. We also study the effect of changing the geometrical center of a pair of sources on the resolution of the double image. Both properties are found to be sensitive to the displacement, which implies that a PhC slab cannot be treated seriously as a flat lens. We also show that by introducing material absorption into the dielectric cylinders of the PhC slab and widening the lateral width of the slab, the imaging uniformity and stability can be substantially improved. This study helps us to clarify the underlying mechanisms of some recently found phenomena concerning imaging instability.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/3/035301