Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration
The performance of an ultrathin (thickness < 0.04λ 0) metasurface superoscillatory lens (metaSOL) is experimentally demonstrated in the terahertz (THz) range. The metaSOL is designed using two different hexagonal unit cells to improve the efficiency and properties of the conventional transparent–...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2021-09-01
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| Series: | Advanced Photonics Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/adpr.202000165 |
| _version_ | 1819029496906383360 |
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| author | Santiago Legaria Jorge Teniente Sergei Kuznetsov Victor Pacheco-Peña Miguel Beruete |
| author_facet | Santiago Legaria Jorge Teniente Sergei Kuznetsov Victor Pacheco-Peña Miguel Beruete |
| author_sort | Santiago Legaria |
| collection | DOAJ |
| description | The performance of an ultrathin (thickness < 0.04λ 0) metasurface superoscillatory lens (metaSOL) is experimentally demonstrated in the terahertz (THz) range. The metaSOL is designed using two different hexagonal unit cells to improve the efficiency and properties of the conventional transparent–opaque zoning approach. The focusing metastructure produces, at a frequency f exp = 295 GHz, a sharp focal spot 8.9λ exp away from its output surface with a transversal resolution of 0.52λ exp (≈25% below the resolution limit imposed by diffraction), a power enhancement of 18.2 dB, and very low side lobe level (−13 dB). Resolution below the diffraction limit is demonstrated in a broad fractional operation bandwidth of 18%. The focusing capabilities of the proposed metaSOL show its potential use in a range of applications such as THz imaging, microscopy, and communications. |
| first_indexed | 2024-12-21T06:15:11Z |
| format | Article |
| id | doaj.art-b317b302107a4a1e9560f8fb4ce2169e |
| institution | Directory Open Access Journal |
| issn | 2699-9293 |
| language | English |
| last_indexed | 2024-12-21T06:15:11Z |
| publishDate | 2021-09-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Photonics Research |
| spelling | doaj.art-b317b302107a4a1e9560f8fb4ce2169e2022-12-21T19:13:25ZengWiley-VCHAdvanced Photonics Research2699-92932021-09-0129n/an/a10.1002/adpr.202000165Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental DemonstrationSantiago Legaria0Jorge Teniente1Sergei Kuznetsov2Victor Pacheco-Peña3Miguel Beruete4Antennas Group Public University of Navarra 31006 Pamplona SpainAntennas Group Public University of Navarra 31006 Pamplona SpainRzhanov Institute of Semiconductor Physics SB RAS Novosibirsk Branch “TDIAM”, Lavrentiev Avenue 2/1 Novosibirsk 630090 Russian FederationSchool of Mathematics, Statistics and Physics Newcastle University Newcastle upon Tyne NE1 7RU UKAntennas Group Public University of Navarra 31006 Pamplona SpainThe performance of an ultrathin (thickness < 0.04λ 0) metasurface superoscillatory lens (metaSOL) is experimentally demonstrated in the terahertz (THz) range. The metaSOL is designed using two different hexagonal unit cells to improve the efficiency and properties of the conventional transparent–opaque zoning approach. The focusing metastructure produces, at a frequency f exp = 295 GHz, a sharp focal spot 8.9λ exp away from its output surface with a transversal resolution of 0.52λ exp (≈25% below the resolution limit imposed by diffraction), a power enhancement of 18.2 dB, and very low side lobe level (−13 dB). Resolution below the diffraction limit is demonstrated in a broad fractional operation bandwidth of 18%. The focusing capabilities of the proposed metaSOL show its potential use in a range of applications such as THz imaging, microscopy, and communications.https://doi.org/10.1002/adpr.202000165metasurfacessubwavelength focusingsuperoscillationssuperoscillatory lensterahertz |
| spellingShingle | Santiago Legaria Jorge Teniente Sergei Kuznetsov Victor Pacheco-Peña Miguel Beruete Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration Advanced Photonics Research metasurfaces subwavelength focusing superoscillations superoscillatory lens terahertz |
| title | Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration |
| title_full | Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration |
| title_fullStr | Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration |
| title_full_unstemmed | Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration |
| title_short | Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration |
| title_sort | highly efficient focusing of terahertz waves with an ultrathin superoscillatory metalens experimental demonstration |
| topic | metasurfaces subwavelength focusing superoscillations superoscillatory lens terahertz |
| url | https://doi.org/10.1002/adpr.202000165 |
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