期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 51, 期 20, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6463/aabc4a
关键词
graded-index photonic crystal; negative refraction imaging; multiband super-resolution; anisotropic
资金
- National Natural Science Foundation of China [61405058]
- Natural Science Foundation of Hunan Province [2017JJ2048]
- Fundamental Research Funds for the Central Universities [531107050979]
Multiband super-resolution imaging of point source is achieved by a graded-index photonic crystal flat lens. With the calculations of six bands in common photonic crystal (CPC) constructed with scatterers of different refractive indices, it can be found that the super-resolution imaging of point source can be realized by different physical mechanisms in three different bands. In the first band, the imaging of point source is based on far-field condition of spherical wave while in the second band, it is based on the negative effective refractive index and exhibiting higher imaging quality than that of the CPC. However, in the fifth band, the imaging of point source is mainly based on negative refraction of anisotropic equi-frequency surfaces. The novel method of employing different physical mechanisms to achieve multiband super-resolution imaging of point source is highly meaningful for the field of imaging.
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