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A plasmonic lens with coupling annular grooves is proposed to achieve enhanced far-field focusing performance. Based on the finite difference time domain (FDTD) method, we demonstrate that a focal beam could be obtained under a radially polarized light illumination. The obtained focal length and working distance range from 3.1 to 3.6 μm and 1.7 to 2.1 μm, respectively. The full-width at half-maximum...
Unlike the case in magnification mode, it is found that hyperlens employed in demagnification and lithography manner encounters great degradation of imaging quality especially for high-resolution image features. This problem mainly arises from the transversal magnetic polarization feature of light which delivers reduced contrast of electronic components intensity profile at the imaging region. Hyperlens...
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