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Proceedings Paper

Interplay of spatial filtering and dispersive effects in metamaterial superlenses
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Paper Abstract

Propagation of continuous-wave (CW) Gaussian beams through a RHM-LHM interface as well as a metamaterial slab or a metallo-dielectric stack is subject to both spatial filtering and dispersive reshapement. Spatial filtering is polarisation-dependent and results from diraction, multiple reflections, and multiple positive or negative refractions on the layer boundaries. Structures with a broad and flat transmission spatial spectrum are capable of imaging with resolution exceeding the diraction limit. Due to strong Drude-type dispersion and absorption of the layers, it is possible to identify higher order dispersion eects taking place within very short distances. This opens the possibility of designing novel filters for joint reshaping of the spatial and temporal pulse envelopes. In the present work, we analyse the transmission of time-modulated CW Gaussian beam through structures with dispersive and lossy layers. Depending on beam divergence and the attenuation strength of the layers, the dominant eect may be identified as one-dimensional propagation with absorption and dispersion, negative refraction with dispersive modulation of the wavefront, or two-dimensional diractive focusing. We propose a theoretical model to explain the interplay of the observed spatial and dispersive phenomena. In the near diraction field pulses are reshaped and broadened. The slopes of the pulses become aected with side-lobes, and with a probable presence of superluminal eects. It is shown that the second-order dispersion eects do not yet provide a suciently accurate model for the pulse evolution. The simulations rely on a rigorous quasi-analytical planewave-based model of propagation. Transfer Matrix method (TMM) is used for numerical calculations.

Paper Details

Date Published: 20 November 2008
PDF: 7 pages
Proc. SPIE 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 71411G (20 November 2008); doi: 10.1117/12.822397
Show Author Affiliations
Jacek Pniewski, Univ. of Warsaw (Poland)
Rafał Kotyński, Univ. of Warsaw (Poland)

Published in SPIE Proceedings Vol. 7141:
16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics
Agnieszka Popiolek-Masajada; Elzbieta Jankowska; Waclaw Urbanczyk, Editor(s)

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