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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
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.

0957-4484
325202
Zhang, Shi
923efddd-edb0-49fd-b333-ce5cbd4ddd45
Zhu, Xupeng
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Xiao, Wei
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Shi, Huimin
3c01b758-ff6b-4218-a7ac-0e1b5770ba4e
Wang, Yasi
46a5453c-0d80-4527-991d-19e9014ff9eb
Chen, Zhiquan
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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
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, [325202]. (doi:10.1088/1361-6528/ab8d68).

Record type: Article

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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Accepted/In Press date: 27 April 2020
e-pub ahead of print date: 28 April 2020

Identifiers

Local EPrints ID: 441623
URI: http://eprints.soton.ac.uk/id/eprint/441623
ISSN: 0957-4484
PURE UUID: 8f159a50-c879-453b-8ae1-153ee8811c4e
ORCID for Wei Xiao: ORCID iD orcid.org/0000-0002-3898-1110
ORCID for Otto L Muskens: ORCID iD orcid.org/0000-0003-0693-5504
ORCID for C H De Groot: ORCID iD orcid.org/0000-0002-3850-7101

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Date deposited: 22 Jun 2020 16:30
Last modified: 18 Feb 2021 17:29

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