Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap
Second-harmonic generation (SHG) facilitated by plasmonic nanostructures has drawn considerable attention, owing to its efficient frequency up-conversion at the nanoscale and potential applications in on-chip integration and nanophotonic devices. Herein, we present a nanodimer array fabricated by na...
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-09-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0293 |
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| author | Hu Junzheng Ye Xiaofei Huang Hui Su Guangxu Lv Zhekai Qin Zhaofu Hu Pan Liu Fanxin Wu Wei Zhan Peng |
| author_facet | Hu Junzheng Ye Xiaofei Huang Hui Su Guangxu Lv Zhekai Qin Zhaofu Hu Pan Liu Fanxin Wu Wei Zhan Peng |
| author_sort | Hu Junzheng |
| collection | DOAJ |
| description | Second-harmonic generation (SHG) facilitated by plasmonic nanostructures has drawn considerable attention, owing to its efficient frequency up-conversion at the nanoscale and potential applications in on-chip integration and nanophotonic devices. Herein, we present a nanodimer array fabricated by nanoimprinting, composed of nanofinger-pair symmetrically leaning at an off-angle with a well-defined sub-nanometric gap. Commonly, geometric symmetry would suppress the far-field SHG due to the near-field cancelling of symmetric surface SH polarization. However, we find that the light-induced surface SH polarization distribution along the wave-vector of incidence could be influenced by the off-angle, which is consistent to the requirement of SH polarization symmetry-breaking in symmetric metallic nanocavity. A dramatic enhancement of far-field SHG is achieved by tuning the off-angle of nanofinger-pair, even approaching up to over 4 orders of magnitude for an optimal value. The demonstration of SHG enhancement on our well-defined plasmonic nanodimer provides a new way of on-chip integration to activate high-efficient SH radiation, which might be potential for applications in novel nonlinear optical nanodevices with remarkable efficiency and sensitivity. |
| format | Article |
| id | doaj-art-be3028c651e640c8b0770ea8f559edbb |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-be3028c651e640c8b0770ea8f559edbb2025-08-20T03:31:20ZengDe GruyterNanophotonics2192-86142024-09-0114111907191510.1515/nanoph-2024-0293Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gapHu Junzheng0Ye Xiaofei1Huang Hui2Su Guangxu3Lv Zhekai4Qin Zhaofu5Hu Pan6Liu Fanxin7Wu Wei8Zhan Peng9National Laboratory of Solid State Microstructures, and School of Physics, Nanjing University, Nanjing210093, ChinaNational Laboratory of Solid State Microstructures, and School of Physics, Nanjing University, Nanjing210093, ChinaNational Laboratory of Solid State Microstructures, and School of Physics, Nanjing University, Nanjing210093, ChinaDepartment of Applied Physics, 12624Zhejiang University of Technology, Hangzhou310023, ChinaDepartment of Applied Physics, 12624Zhejiang University of Technology, Hangzhou310023, ChinaSchool of Mathematics and Physics, Guangxi Minzu University, Nanning530006, ChinaDepartment of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, CA90089, USADepartment of Applied Physics, 12624Zhejiang University of Technology, Hangzhou310023, ChinaDepartment of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, CA90089, USANational Laboratory of Solid State Microstructures, and School of Physics, Nanjing University, Nanjing210093, ChinaSecond-harmonic generation (SHG) facilitated by plasmonic nanostructures has drawn considerable attention, owing to its efficient frequency up-conversion at the nanoscale and potential applications in on-chip integration and nanophotonic devices. Herein, we present a nanodimer array fabricated by nanoimprinting, composed of nanofinger-pair symmetrically leaning at an off-angle with a well-defined sub-nanometric gap. Commonly, geometric symmetry would suppress the far-field SHG due to the near-field cancelling of symmetric surface SH polarization. However, we find that the light-induced surface SH polarization distribution along the wave-vector of incidence could be influenced by the off-angle, which is consistent to the requirement of SH polarization symmetry-breaking in symmetric metallic nanocavity. A dramatic enhancement of far-field SHG is achieved by tuning the off-angle of nanofinger-pair, even approaching up to over 4 orders of magnitude for an optimal value. The demonstration of SHG enhancement on our well-defined plasmonic nanodimer provides a new way of on-chip integration to activate high-efficient SH radiation, which might be potential for applications in novel nonlinear optical nanodevices with remarkable efficiency and sensitivity.https://doi.org/10.1515/nanoph-2024-0293shgpolarization symmetry-breakingsymmetric nanofinger-dimersub-nanometric gapon-chip integration |
| spellingShingle | Hu Junzheng Ye Xiaofei Huang Hui Su Guangxu Lv Zhekai Qin Zhaofu Hu Pan Liu Fanxin Wu Wei Zhan Peng Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap Nanophotonics shg polarization symmetry-breaking symmetric nanofinger-dimer sub-nanometric gap on-chip integration |
| title | Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap |
| title_full | Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap |
| title_fullStr | Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap |
| title_full_unstemmed | Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap |
| title_short | Second-harmonic radiation by on-chip integrable mirror-symmetric nanodimers with sub-nanometric plasmonic gap |
| title_sort | second harmonic radiation by on chip integrable mirror symmetric nanodimers with sub nanometric plasmonic gap |
| topic | shg polarization symmetry-breaking symmetric nanofinger-dimer sub-nanometric gap on-chip integration |
| url | https://doi.org/10.1515/nanoph-2024-0293 |
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