Strongly coupled evenly divided disks: a new compact and tunable platform for plasmonic Fano resonances
Strongly coupled evenly divided disks: a new compact and tunable platform for plasmonic Fano resonances
Plasmonic artificial molecules are promising platforms for linear and nonlinear optical modulation at various regimes including the visible, infrared and terahertz bands. Fano resonances in plasmonic artificial structures are widely used for controlling spectral lineshapes and tailoring of near-field and far-field optical response. Generation of a strong Fano resonance usually relies on strong plasmon coupling in densely packed plasmonic structures. Challenges in reproducible fabrication using conventional lithography significantly hinders the exploration of novel plasmonic nanostructures for strong Fano resonance. In this work, we propose a new class of plasmonic molecules with symmetric structure for Fano resonances, named evenly divided disk, which shows a strong Fano resonance due to the interference between a subradiant anti-bonding mode and a superradiant bonding mode. We successfully fabricated evenly divided disk structures with high reproducibility and with sub-20 nm gaps, using our recently developed sketch and peel lithography technique. The experimental spectra agree well with the calculated response, indicating the robustness of the Fano resonance for the evenly divided disk geometry. Control experiments reveal that the strength of the Fano resonance gradually increases when increasing the number of split parts on the disk from three to eight individual segments. The Fano-resonant plasmonic molecules that can also be reliably defined by our unique fabrication approach open up new avenues for application and provide insight into the design of artificial molecules for controlling light-matter interactions.
325202
Zhang, Shi
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Zhu, Xupeng
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Xiao, Wei
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Shi, Huimin
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Wang, Yasi
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Chen, Zhiquan
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Chen, Yiqin
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Sun, Kai
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Muskens, Otto L
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De Groot, C H
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Liu, Shao-Ding
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Duan, Huigao
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7 August 2020
Zhang, Shi
923efddd-edb0-49fd-b333-ce5cbd4ddd45
Zhu, Xupeng
e4198221-2dee-49a8-be47-80f7291d5b9f
Xiao, Wei
20758ef4-698c-46e5-bb9b-a97db7340379
Shi, Huimin
3c01b758-ff6b-4218-a7ac-0e1b5770ba4e
Wang, Yasi
46a5453c-0d80-4527-991d-19e9014ff9eb
Chen, Zhiquan
6d8a5941-d9ac-4250-8cca-60e9773a35e6
Chen, Yiqin
0ac508df-7920-49a8-9be2-abdaa8ef6abc
Sun, Kai
b7c648a3-7be8-4613-9d4d-1bf937fb487b
Muskens, Otto L
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
De Groot, C H
92cd2e02-fcc4-43da-8816-c86f966be90c
Liu, Shao-Ding
ea708cd2-3b5d-45fc-a87d-4114b73d70eb
Duan, Huigao
6de5bf88-84c8-4a8f-b5a1-67fc5bf3246e
Zhang, Shi, Zhu, Xupeng, Xiao, Wei, Shi, Huimin, Wang, Yasi, Chen, Zhiquan, Chen, Yiqin, Sun, Kai, Muskens, Otto L, De Groot, C H, Liu, Shao-Ding and Duan, Huigao
(2020)
Strongly coupled evenly divided disks: a new compact and tunable platform for plasmonic Fano resonances.
Nanotechnology, 31 (32), , [325202].
(doi:10.1088/1361-6528/ab8d68).
Abstract
Plasmonic artificial molecules are promising platforms for linear and nonlinear optical modulation at various regimes including the visible, infrared and terahertz bands. Fano resonances in plasmonic artificial structures are widely used for controlling spectral lineshapes and tailoring of near-field and far-field optical response. Generation of a strong Fano resonance usually relies on strong plasmon coupling in densely packed plasmonic structures. Challenges in reproducible fabrication using conventional lithography significantly hinders the exploration of novel plasmonic nanostructures for strong Fano resonance. In this work, we propose a new class of plasmonic molecules with symmetric structure for Fano resonances, named evenly divided disk, which shows a strong Fano resonance due to the interference between a subradiant anti-bonding mode and a superradiant bonding mode. We successfully fabricated evenly divided disk structures with high reproducibility and with sub-20 nm gaps, using our recently developed sketch and peel lithography technique. The experimental spectra agree well with the calculated response, indicating the robustness of the Fano resonance for the evenly divided disk geometry. Control experiments reveal that the strength of the Fano resonance gradually increases when increasing the number of split parts on the disk from three to eight individual segments. The Fano-resonant plasmonic molecules that can also be reliably defined by our unique fabrication approach open up new avenues for application and provide insight into the design of artificial molecules for controlling light-matter interactions.
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ZhangNanotechnology2020
- Accepted Manuscript
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ZhangNanotechnology2020 Supporting information
- Accepted Manuscript
More information
Accepted/In Press date: 27 April 2020
e-pub ahead of print date: 28 April 2020
Published date: 7 August 2020
Additional Information:
Publisher Copyright:
© 2020 IOP Publishing Ltd.
Identifiers
Local EPrints ID: 441623
URI: http://eprints.soton.ac.uk/id/eprint/441623
ISSN: 0957-4484
PURE UUID: 8f159a50-c879-453b-8ae1-153ee8811c4e
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Date deposited: 22 Jun 2020 16:30
Last modified: 17 Mar 2024 05:39
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Contributors
Author:
Shi Zhang
Author:
Xupeng Zhu
Author:
Huimin Shi
Author:
Yasi Wang
Author:
Zhiquan Chen
Author:
Yiqin Chen
Author:
Shao-Ding Liu
Author:
Huigao Duan
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