Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity
We theoretically study the multiple sharp Fano resonances produced by the near-field coupling between the multipolar narrow plasmonic whispering-gallery modes (WGMs) and the broad-sphere plasmon modes supported by a deep-subwavelength spherical hyperbolic metamaterial (HMM) cavity, which is construc...
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| Format: | Article |
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MDPI AG
2021-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/9/2301 |
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| author | Ping Gu Yuheng Guo Jing Chen Zuxing Zhang Zhendong Yan Fanxin Liu Chaojun Tang Wei Du Zhuo Chen |
| author_facet | Ping Gu Yuheng Guo Jing Chen Zuxing Zhang Zhendong Yan Fanxin Liu Chaojun Tang Wei Du Zhuo Chen |
| author_sort | Ping Gu |
| collection | DOAJ |
| description | We theoretically study the multiple sharp Fano resonances produced by the near-field coupling between the multipolar narrow plasmonic whispering-gallery modes (WGMs) and the broad-sphere plasmon modes supported by a deep-subwavelength spherical hyperbolic metamaterial (HMM) cavity, which is constructed by five alternating silver/dielectric layers wrapping a dielectric nanosphere core. We find that the linewidths of WGMs-induced Fano resonances are as narrow as 7.4–21.7 nm due to the highly localized feature of the electric fields. The near-field coupling strength determined by the resonant energy difference between WGMs and corresponding sphere plasmon modes can lead to the formation of the symmetric-, asymmetric-, and typical Fano lineshapes in the far-field extinction efficiency spectrum. The deep-subwavelength feature of the proposed HMM cavity is verified by the large ratio (~5.5) of the longest resonant wavelength of WGM<sub>1,1</sub> (1202.1 nm) to the cavity size (diameter: 220 nm). In addition, the resonant wavelengths of multiple Fano resonances can be easily tuned by adjusting the structural/material parameters (the dielectric core radius, the thickness and refractive index of the dielectric layers) of the HMM cavity. The narrow linewidth, multiple, and tunability of the observed Fano resonances, together with the deep-subwavelength feature of the proposed HMM cavity may create potential applications in nanosensors and nanolasers. |
| first_indexed | 2024-03-10T07:22:20Z |
| format | Article |
| id | doaj.art-965efe3fb63943b5a89c854357f6355d |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T07:22:20Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-965efe3fb63943b5a89c854357f6355d2023-11-22T14:30:26ZengMDPI AGNanomaterials2079-49912021-09-01119230110.3390/nano11092301Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial CavityPing Gu0Yuheng Guo1Jing Chen2Zuxing Zhang3Zhendong Yan4Fanxin Liu5Chaojun Tang6Wei Du7Zhuo Chen8Institute of Advanced Photonics Technology, College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaInstitute of Advanced Photonics Technology, College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaInstitute of Advanced Photonics Technology, College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaInstitute of Advanced Photonics Technology, College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, ChinaSchool of Science, Nanjing Forestry University, Nanjing 210037, ChinaSchool of Science, Zhejiang University of Technology, Hangzhou 310023, ChinaSchool of Science, Zhejiang University of Technology, Hangzhou 310023, ChinaSchool of Physics Science and Technology, Yangzhou University, Yangzhou 225002, ChinaNational Laboratory of Solid State Microstructures, Schoolof Physics, Nanjing University, Nanjing 210093, ChinaWe theoretically study the multiple sharp Fano resonances produced by the near-field coupling between the multipolar narrow plasmonic whispering-gallery modes (WGMs) and the broad-sphere plasmon modes supported by a deep-subwavelength spherical hyperbolic metamaterial (HMM) cavity, which is constructed by five alternating silver/dielectric layers wrapping a dielectric nanosphere core. We find that the linewidths of WGMs-induced Fano resonances are as narrow as 7.4–21.7 nm due to the highly localized feature of the electric fields. The near-field coupling strength determined by the resonant energy difference between WGMs and corresponding sphere plasmon modes can lead to the formation of the symmetric-, asymmetric-, and typical Fano lineshapes in the far-field extinction efficiency spectrum. The deep-subwavelength feature of the proposed HMM cavity is verified by the large ratio (~5.5) of the longest resonant wavelength of WGM<sub>1,1</sub> (1202.1 nm) to the cavity size (diameter: 220 nm). In addition, the resonant wavelengths of multiple Fano resonances can be easily tuned by adjusting the structural/material parameters (the dielectric core radius, the thickness and refractive index of the dielectric layers) of the HMM cavity. The narrow linewidth, multiple, and tunability of the observed Fano resonances, together with the deep-subwavelength feature of the proposed HMM cavity may create potential applications in nanosensors and nanolasers.https://www.mdpi.com/2079-4991/11/9/2301spherical hyperbolic metamaterial cavitymultiple Fano resonancestunability |
| spellingShingle | Ping Gu Yuheng Guo Jing Chen Zuxing Zhang Zhendong Yan Fanxin Liu Chaojun Tang Wei Du Zhuo Chen Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity Nanomaterials spherical hyperbolic metamaterial cavity multiple Fano resonances tunability |
| title | Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity |
| title_full | Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity |
| title_fullStr | Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity |
| title_full_unstemmed | Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity |
| title_short | Multiple Sharp Fano Resonances in a Deep-Subwavelength Spherical Hyperbolic Metamaterial Cavity |
| title_sort | multiple sharp fano resonances in a deep subwavelength spherical hyperbolic metamaterial cavity |
| topic | spherical hyperbolic metamaterial cavity multiple Fano resonances tunability |
| url | https://www.mdpi.com/2079-4991/11/9/2301 |
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