Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes
<b>Background</b>: Optical components with high damage thresholds are very desirable in intense-light systems. Metalenses, being composed of phase-control nanostructures with peculiar properties, are one of the important component candidates in future optical systems. However, the optoth...
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MDPI AG
2022-01-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/9/1/39 |
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| author | Feng Tang Qingzhi Li Haichao Yu Zao Yi Xin Ye |
| author_facet | Feng Tang Qingzhi Li Haichao Yu Zao Yi Xin Ye |
| author_sort | Feng Tang |
| collection | DOAJ |
| description | <b>Background</b>: Optical components with high damage thresholds are very desirable in intense-light systems. Metalenses, being composed of phase-control nanostructures with peculiar properties, are one of the important component candidates in future optical systems. However, the optothermal mechanism in metalenses is still not investigated adequately. <b>Methods</b>: In this study, the optothermal absorption in transmissive metalenses made of silicon nanobricks and nanoholes is investigated comparatively to address this issue. <b>Results</b>: The geometrical dependencies of nanostructures’ transmittance, phase difference, and field distribution are calculated numerically via simulations. To demonstrate the optothermal mechanism in metalenses, the mean absorption efficiencies of the selected unit-cells, which would constitute metalenses, are analyzed. The results show that the electric field in the silicon zone would lead to an obvious thermal effect, and the enhancement of the localized electric field also results in the strong absorption of optical energy. Then, two typical metalenses are designed based on these nanobricks and nanoholes. The optothermal simulations show that the nanobrick-based metalens can handle a power density of 0.15 W/µm<sup>2</sup>, and the density of the nanohole-based design is 0.12 W/µm<sup>2</sup>. <b>Conclusions</b>: The study analyzes and compares the optothermal absorption in nanobricks and nanoholes, which shows that the electric-field distribution in absorbent materials and the localized-field enhancement are the two key effects that lead to optothermal absorption. This study provides an approach to improve the anti-damage potentials of transmissive metalenses for intense-light systems. |
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| language | English |
| last_indexed | 2024-03-10T00:41:39Z |
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| spelling | doaj.art-dbd397241c8743629486fa3cdf4f9e242023-11-23T15:06:25ZengMDPI AGPhotonics2304-67322022-01-01913910.3390/photonics9010039Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and NanoholesFeng Tang0Qingzhi Li1Haichao Yu2Zao Yi3Xin Ye4Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaResearch Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, ChinaSuzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215125, ChinaJoint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, ChinaResearch Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China<b>Background</b>: Optical components with high damage thresholds are very desirable in intense-light systems. Metalenses, being composed of phase-control nanostructures with peculiar properties, are one of the important component candidates in future optical systems. However, the optothermal mechanism in metalenses is still not investigated adequately. <b>Methods</b>: In this study, the optothermal absorption in transmissive metalenses made of silicon nanobricks and nanoholes is investigated comparatively to address this issue. <b>Results</b>: The geometrical dependencies of nanostructures’ transmittance, phase difference, and field distribution are calculated numerically via simulations. To demonstrate the optothermal mechanism in metalenses, the mean absorption efficiencies of the selected unit-cells, which would constitute metalenses, are analyzed. The results show that the electric field in the silicon zone would lead to an obvious thermal effect, and the enhancement of the localized electric field also results in the strong absorption of optical energy. Then, two typical metalenses are designed based on these nanobricks and nanoholes. The optothermal simulations show that the nanobrick-based metalens can handle a power density of 0.15 W/µm<sup>2</sup>, and the density of the nanohole-based design is 0.12 W/µm<sup>2</sup>. <b>Conclusions</b>: The study analyzes and compares the optothermal absorption in nanobricks and nanoholes, which shows that the electric-field distribution in absorbent materials and the localized-field enhancement are the two key effects that lead to optothermal absorption. This study provides an approach to improve the anti-damage potentials of transmissive metalenses for intense-light systems.https://www.mdpi.com/2304-6732/9/1/39optothermal absorptionmetasurfacescomplementary nanostructuresintense-light systems |
| spellingShingle | Feng Tang Qingzhi Li Haichao Yu Zao Yi Xin Ye Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes Photonics optothermal absorption metasurfaces complementary nanostructures intense-light systems |
| title | Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes |
| title_full | Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes |
| title_fullStr | Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes |
| title_full_unstemmed | Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes |
| title_short | Theoretical Comparison of Optothermal Absorption in Transmissive Metalenses Composed of Nanobricks and Nanoholes |
| title_sort | theoretical comparison of optothermal absorption in transmissive metalenses composed of nanobricks and nanoholes |
| topic | optothermal absorption metasurfaces complementary nanostructures intense-light systems |
| url | https://www.mdpi.com/2304-6732/9/1/39 |
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