Two-Dimensional Imaging by Far-Field Superlens at Visible Wavelengths

Abstract

We report that two-dimensional (2D) sub-diffraction-limited images can be theoretically reconstructed by a new metamaterial far-field superlens. The metamaterial far-field superlens, composed of a metal-dielectric multilayer and a one-dimensional (1D) subwavelength grating, can work over a broad range of visible wavelengths intrinsically. The imaging principle and the reconstruction process are described in detail. The 2D sub-diffraction-limited imaging ability enables more applications of the far-field superlens in optical nanoimaging and sensing.

Active Terahertz Nanoantennas Based on VO2 Phase Transition

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ABSTRACT Unusual performances of metamaterials such as negative index of refraction, memory effect, and cloaking originate from the resonance features of the metallic composite atom [1][2][3][4][5][6] . Indeed, control of metamaterial properties by changing dielectric environments of thin films below the metallic resonators has been demonstrated [7][8][9][10][11] .

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Two-Dimensional Sub-diffraction-limited Imaging by an Optimized Multilayer Superlens

“…In this regime the surface-plasmon mode splitting on the metal layers leads to subwavelength imaging that is different from the surface-plasmon resonance excitation at the permittivity-matching condition [30]. Both conditions for the canalization regime (ε x = ε y = 1 and ε z →∞) cannot be satisfied simultaneously, due to practical restrictions on the available materials, and losses [7].…”

From microscopy to nanoscopy via visible light

“…The geometrical structure of the FSL ensures that the transition of diffractive orders other than 21 will be eliminated so that 'one-toone' conversion-essential for the unambiguous projection of subdiffraction details to the far-field-can be realized. Xiong et al 36 expanded the super-resolution capability of the FSL to two dimensions in the same year, using a modified, multilayer grating ( Figure 3c). Yet the magnification of subdiffraction features into the far-field was still impossible until the hyperlens was demonstrated 37 ( Figure 3d).…”