Enhance the resolution of photonic crystal negative refraction imaging by metal grating

ArticleinOptics Letters 37(3):359-61 · February 2012with10 Reads
Impact Factor: 3.29 · DOI: 10.1364/OL.37.000359 · Source: PubMed


    The resolution of imaging is limited by the missing of high-frequencies information. The superlens employing negative refraction can compensate for these components. But for the directional coupling of Bloch waves and the low coupling efficiency of large-angle waves, the resolution of subwavelength imaging is not satisfactory. However, the subwavelength metallic grating can produce high-order diffracted waves carrying a lot of high-frequencies information. Therefore, this structure is used to inhibit the zero-order diffraction and enhance the high-order diffraction to achieve super-resolution.