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A metamaterial slab, used as a superlens in a subwavelength imaging system, is frequently assumed homogeneous. It is the bulk properties of the metamaterial which are responsible for the resolution of the transferred information in the image domain, as a result of high transverse wave-vector coupling. However, how in a discretized metamaterial, individual meta-atoms (i.e., the meta-elements composing...
We propose a far-field sub-wavelength imaging scheme, where evanescent waves from an object are converted to sustainable propagating waves by using optical gain. This approach does not rely on negative refraction, hyper-lenses, or plasmonic effects.
We reconsider the refraction of evanescent waves at an interface between air and a negative index medium under the assumption that the negative index medium is necessarily dispersive and lossy. We show that all evanescent waves in air will be refracted into decaying propagating waves inside the negative index medium, with different spatial frequency components having different propagation directions...
We report measurements of internal field intensity distribution over 1-D form-birefringent periodic structures of finite length. Field distributions and field enhancement are verified but at significantly reduced strength attributed to small but finite material loss.
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