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Far-Field Subwavelength Straight-Line Projection/Imaging by Means of a Novel Double-Near-Zero Index-Based Two-Layer Metamaterial
| Content Provider | MDPI |
|---|---|
| Author | Dehbashi, Reza Plakhotnik, Taras Nieminen, Timo A. |
| Copyright Year | 2021 |
| Description | In this paper, for the first time, tuned near-zero-index materials are used in a structure for the long-distance projection of very closely spaced objects with subwavelength separation. Near-zero-index materials have never been used for subwavelength projection/imaging. The proposed novel structure is composed of a two-layer slab that can project two slits with a subwavelength separation distance to a long distance without diverged/converged interference of the two imaged waves. The two-layer slab consists of a thin double-near-zero (DNZ) slab with an obtained tuned index of 0.05 and thickness of $0.04λ_{0}$ coupled with a high-index dielectric slab with specific thicknesses. Through a parametric study, the non-zero index of the DNZ layer is tuned to create a clear image when it is coupled with the high-index dielectric layer. The minimum size for the aperture of the proposed two-layer slab is $2λ_{0}$ to provide a clear projection of the two slits. The space between the slits is $λ_{0}$/8, which is five times beyond the diffraction limit. It is shown that, through the conventional methods (e.g., only with high-index dielectric slabs, uncoupled with a DNZ layer), it is impossible to clearly project slits at a large distance $(~λ_{0}$) due to the diffraction limit. An analytical analysis, as well as numerical results in a finite-element-based simulator, confirm the function of the proposed structure. |
| Starting Page | 5484 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma14195484 |
| Journal | Materials |
| Issue Number | 19 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-09-22 |
| Access Restriction | Open |
| Subject Keyword | Materials Imaging Science Double-near-zero Metamaterials Electromagnetic Scattering Electromagnetic Theory Electromagnetic Waves Imaging Scattering |
| Content Type | Text |
| Resource Type | Article |
