Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes
Despite the widespread interest in the metalens technology, few works show the errors during fabrication and analyze how they influence the focusing performance. In this work, we proposed a reflective metalens design and carry out a fundamental study on how a mild tapering angle (<6...
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| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9134910/ |
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| author | Ronghui Lin Zahrah Alnakhli Feras AlQatari Xiaohang Li |
| author_facet | Ronghui Lin Zahrah Alnakhli Feras AlQatari Xiaohang Li |
| author_sort | Ronghui Lin |
| collection | DOAJ |
| description | Despite the widespread interest in the metalens technology, few works show the errors during fabrication and analyze how they influence the focusing performance. In this work, we proposed a reflective metalens design and carry out a fundamental study on how a mild tapering angle (<6°) of the nanopillars would influence the performance of a reflective metalens. By analyzing the interaction of Mie resonance in the lateral direction and Fabry-Pérot resonance in the longitudinal direction using numerical simulations, we reveal the detrimental role the tapering angle plays due to the low transmission near the resonance. We observe the weakening of the electric quadrupole and magnetic dipole response, and the increase of the electric dipole response for tapered nanopillars. Moreover, the Fabry-Pérot resonance is disturbed due to the broken symmetry. These factors contribute to lower Q factor resonance and hence the low transmission. The results presented in this work can guide the analysis of fabrication errors and provide insights on how to compensate them. |
| format | Article |
| id | doaj-art-cbba7df534a340d2a1664d161522c4c7 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-cbba7df534a340d2a1664d161522c4c72025-08-20T03:15:50ZengIEEEIEEE Photonics Journal1943-06552020-01-011241710.1109/JPHOT.2020.30074899134910Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order ModesRonghui Lin0https://orcid.org/0000-0002-7664-8845Zahrah Alnakhli1Feras AlQatari2Xiaohang Li3https://orcid.org/0000-0002-4434-365XAdvanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi ArabiaAdvanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi ArabiaAdvanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi ArabiaAdvanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi ArabiaDespite the widespread interest in the metalens technology, few works show the errors during fabrication and analyze how they influence the focusing performance. In this work, we proposed a reflective metalens design and carry out a fundamental study on how a mild tapering angle (<6°) of the nanopillars would influence the performance of a reflective metalens. By analyzing the interaction of Mie resonance in the lateral direction and Fabry-Pérot resonance in the longitudinal direction using numerical simulations, we reveal the detrimental role the tapering angle plays due to the low transmission near the resonance. We observe the weakening of the electric quadrupole and magnetic dipole response, and the increase of the electric dipole response for tapered nanopillars. Moreover, the Fabry-Pérot resonance is disturbed due to the broken symmetry. These factors contribute to lower Q factor resonance and hence the low transmission. The results presented in this work can guide the analysis of fabrication errors and provide insights on how to compensate them.https://ieeexplore.ieee.org/document/9134910/Metalensmie resonancefabry-pérot resonance |
| spellingShingle | Ronghui Lin Zahrah Alnakhli Feras AlQatari Xiaohang Li Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes IEEE Photonics Journal Metalens mie resonance fabry-pérot resonance |
| title | Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes |
| title_full | Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes |
| title_fullStr | Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes |
| title_full_unstemmed | Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes |
| title_short | Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes |
| title_sort | analysis of tapered nanopillars for reflective metalens the role of higher order modes |
| topic | Metalens mie resonance fabry-pérot resonance |
| url | https://ieeexplore.ieee.org/document/9134910/ |
| work_keys_str_mv | AT ronghuilin analysisoftaperednanopillarsforreflectivemetalenstheroleofhigherordermodes AT zahrahalnakhli analysisoftaperednanopillarsforreflectivemetalenstheroleofhigherordermodes AT ferasalqatari analysisoftaperednanopillarsforreflectivemetalenstheroleofhigherordermodes AT xiaohangli analysisoftaperednanopillarsforreflectivemetalenstheroleofhigherordermodes |