Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars
Infrared detection technology has important applications in laser ranging, imaging, night vision, and other fields. Furthermore, recent studies have proven that hot carriers which are generated by surface plasmon decay can be exploited for photodetection to get beyond semiconductors’ bandgap restric...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/1/60 |
| _version_ | 1797437734471598080 |
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| author | Tangyou Sun Wenke Song Zubin Qin Wenjing Guo Peihua Wangyang Zhiping Zhou Yanrong Deng |
| author_facet | Tangyou Sun Wenke Song Zubin Qin Wenjing Guo Peihua Wangyang Zhiping Zhou Yanrong Deng |
| author_sort | Tangyou Sun |
| collection | DOAJ |
| description | Infrared detection technology has important applications in laser ranging, imaging, night vision, and other fields. Furthermore, recent studies have proven that hot carriers which are generated by surface plasmon decay can be exploited for photodetection to get beyond semiconductors’ bandgap restriction. In this study, silicon nanopillars (NPs) and gold film at the top and bottom of silicon nanopillars were designed to generate surface plasmon resonance and Fabry–Perot resonance to achieve perfect absorption. The absorption was calculated using the Finite Difference Time Domain (FDTD) method, and factors’ effects on resonance wavelength and absorption were examined. Here we demonstrate how this perfect absorber can be used to achieve near-unity optical absorption using ultrathin plasmonic nanostructures with thicknesses of 15 nm, smaller than the hot electron diffusion length. Further study revealed that the resonance wavelength can be redshifted to the mid-infrared band (e.g., 3.75 μm) by increasing the value of the structure parameters. These results demonstrate a success in the study of polarization insensitivity, detection band adjustable, and efficient perfect absorption infrared photodetectors. |
| first_indexed | 2024-03-09T11:26:54Z |
| format | Article |
| id | doaj.art-bdff04801fa742d79233ed95f9de1a9d |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T11:26:54Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
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| series | Photonics |
| spelling | doaj.art-bdff04801fa742d79233ed95f9de1a9d2023-12-01T00:02:02ZengMDPI AGPhotonics2304-67322023-01-011016010.3390/photonics10010060Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon NanopillarsTangyou Sun0Wenke Song1Zubin Qin2Wenjing Guo3Peihua Wangyang4Zhiping Zhou5Yanrong Deng6Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, ChinaState Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, ChinaGuangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology, Guilin 541004, ChinaInfrared detection technology has important applications in laser ranging, imaging, night vision, and other fields. Furthermore, recent studies have proven that hot carriers which are generated by surface plasmon decay can be exploited for photodetection to get beyond semiconductors’ bandgap restriction. In this study, silicon nanopillars (NPs) and gold film at the top and bottom of silicon nanopillars were designed to generate surface plasmon resonance and Fabry–Perot resonance to achieve perfect absorption. The absorption was calculated using the Finite Difference Time Domain (FDTD) method, and factors’ effects on resonance wavelength and absorption were examined. Here we demonstrate how this perfect absorber can be used to achieve near-unity optical absorption using ultrathin plasmonic nanostructures with thicknesses of 15 nm, smaller than the hot electron diffusion length. Further study revealed that the resonance wavelength can be redshifted to the mid-infrared band (e.g., 3.75 μm) by increasing the value of the structure parameters. These results demonstrate a success in the study of polarization insensitivity, detection band adjustable, and efficient perfect absorption infrared photodetectors.https://www.mdpi.com/2304-6732/10/1/60surface plasmonssub-wavelength nanopillars arrayperfect absorberhot electronsinfrared photodetection |
| spellingShingle | Tangyou Sun Wenke Song Zubin Qin Wenjing Guo Peihua Wangyang Zhiping Zhou Yanrong Deng Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars Photonics surface plasmons sub-wavelength nanopillars array perfect absorber hot electrons infrared photodetection |
| title | Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars |
| title_full | Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars |
| title_fullStr | Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars |
| title_full_unstemmed | Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars |
| title_short | Tunable Plasmonic Perfect Absorber for Hot Electron Photodetection in Gold-Coated Silicon Nanopillars |
| title_sort | tunable plasmonic perfect absorber for hot electron photodetection in gold coated silicon nanopillars |
| topic | surface plasmons sub-wavelength nanopillars array perfect absorber hot electrons infrared photodetection |
| url | https://www.mdpi.com/2304-6732/10/1/60 |
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