Near-Field Periodic Subwavelength Holey Metallic Plate for Far-Field Superresolution Focusing
Far-field focusing with superresolution aided by a proposed metallic plate is investigated in this paper. The proposed near-field structure can be employed to distinguish point-like sources with subwavelength distance and enhance the field strength based on the spoof surface plasmon polaritons theor...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2017-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/7829357/ |
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| Summary: | Far-field focusing with superresolution aided by a proposed metallic plate is investigated in this paper. The proposed near-field structure can be employed to distinguish point-like sources with subwavelength distance and enhance the field strength based on the spoof surface plasmon polaritons theory, and by the simulations of near- and far-field spectrums, it can be found that some near-field evanescent waves carried the superresolution information can be converted to propagation waves and propagate to the far-field. Therefore, with the help of time reversal imaging process, the far-field superresolution focusing is validated by the experiments in laboratory environment. A resolution of <inline-formula><tex-math notation="LaTeX">$\sim$</tex-math></inline-formula><inline-formula> <tex-math notation="LaTeX">$\lambda$</tex-math></inline-formula>/13 is achieved from the last results, which is well beyond the diffraction limit. |
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| ISSN: | 1943-0655 |