Enhance the resolution of photonic crystal negative refraction imaging by metal grating.
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.
Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, China.
Peng
P
Shi
Kun
K
Huang
Yong-ping
YP
Li