FDTD study of subwavelength imaging by a photonic crystal slab |
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Authors: | F. AbdelMalek W. Belhadj H. Bouchriha |
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Affiliation: | aQuantum Physics and Photonics Laboratory, Tunisian University of Sciences, BP 1060 Cedex Tunis, Tunisia;bNational Institute for Applied Sciences and Technology, BP 676 Cedex 1080 Tunis, Tunisia |
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Abstract: | The problem of subwavelength imaging via a photonic crystal slab lens made of two-dimensional (2D) square arrays of parallel dielectric cylinders in air is studied and discussed theoretically. The finite-difference time-domain method is employed to investigate the unique features of imaging by such lens. We confirm earlier findings that a photonic crystal slab lens can provide the imaging of a point source. By analysing the transmission properties of the proposed structure, we demonstrate that inside the all-angle negative refraction, there are some favourable directions for waves to travel. We show that the surface termination of the photonic crystal is a key parameter to obtain a good quality image. The super-resolution of two sources separated by a distance less than the wavelength is also considered. It is shown that the achievable resolution is limited by the slab length. |
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Keywords: | Negative refraction Left-handed material (LHM) FDTD Subwavelength imaging Super-resolution Photonic crystal |
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