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

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52910

Title:	Influence of source displacement on the features of subwavelength imaging of a photonic crystal slab
Authors:	Luan,PG;Chiang,CY;Yeh,HY
Contributors:	物理學系
Keywords:	NEGATIVE REFRACTION;LENS
Date:	2011
Issue Date:	2012-06-11 10:49:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	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.
Relation:	JOURNAL OF PHYSICS-CONDENSED MATTER
Appears in Collections:	[Department of Physics] journal & Dissertation

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