Sub-wavelength focusing meta-lens
We show that a planar plasmonic metamaterial with spatially variable meta-atom parameters can focus transmitted light into subwavelength hot-spots located beyond the near-field of the metamaterial. By nano-structuring a gold film we created an array of meta-lenses generating foci of 160 nm (0.2λ) in...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/97544 http://hdl.handle.net/10220/11846 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We show that a planar plasmonic metamaterial with spatially variable meta-atom parameters can focus transmitted light into subwavelength hot-spots located beyond the near-field of the metamaterial. By nano-structuring a gold film we created an array of meta-lenses generating foci of 160 nm (0.2λ) in diameter when illuminated by a wavelength of 800 nm. We attribute the occurrence of sub-wavelength hotspots beyond the near field to the phenomenon of superoscillation. |
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