Far-field high resolution effects and manipulating of electromagnetic waves based on transformation optics

• Published in: Optics communications Vol. 342; pp. 193 - 198
• Main Authors: Ji, XueBin, Zang, XiaoFei, Li, Zhou, Shi, Cheng, Chen, Lin, Cai, Bin, Zhu, YiMing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2015
• Subjects: Far field; High-resolution; Magnifying property; Transformation optics; Transformation optics; Far field; High-resolution; Magnifying property
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2014.12.078

Based on the transformation optics (TO) and the effective medium theory (EMT), a new illusion media with homogeneous and isotropic materials is proposed to realize the far-field high resolution effects. When two point sources with the separation distance of λ0/4 are covered with the illusion media (λ0 is the free-space wavelength), the corresponding far-field pattern is equivalent to the case of two point sources with the separation distance larger than λ0/2 in free space, leading to the far-field high resolution effects (in free space, the separation distance of λ0/4 is less than half-wavelength, and thus the two point sources cannot be distinguished from each other). Furthermore, such illusion media can be applied to design tunable high-directivity antenna and an angle-dependent floating carpet cloak. Full wave simulations are carried out to verify the performance of our device.