Ultra narrow Fano resonance of 2D array of the Ag trigonal-helix nanostructure

• Published in: Photonics and nanostructures Vol. 50; p. 101021
• Main Authors: Azarian, A., Kabiri, A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2022; Elsevier Science Ltd
• Subjects: Arrays; Fano resonance; Helix nanostructure; Nanoparticles; Nanosensors; Nanostructure; SLR; Ultra narrow peak; SLR; Fano resonance; Helix nanostructure; Ultra narrow peak
• ISSN: 1569-4410; 1569-4429
• DOI: 10.1016/j.photonics.2022.101021

The surface lattice resonance (SLR) created by metal nanoparticles in a regular periodic array shows a narrower bandwidth than single nanoparticles, leading to widespread applications in the field of nanolasers and nanosensors. In this work, we studied the plasmonic properties of the Ag trigonal-helix nanostructures (ATHNs). Our results show that an ultra-narrow Fano resonance with linewidths as narrow as ~1.5 nm from arrays of ATHNs at λ ~ 388 nm, which will be especially useful in the UV-applications. Moreover, the resonant wavelength of the Fano peaks shows a strong dependence on the array periodicity, which enables us to adjust Fano resonance at the desired wavelength in all UV-Vis and near-IR regimes. The results of this work may be used to build more advanced sensors based on the Fano plasmon lattice resonance. •We studied the plasmonic surface lattice resonances of the 2D array of the Ag trigonal-helix nanostructures.•We find the especial ultra-narrow Fano resonances with line-width as narrow as ~1.5 nm.•The line width of the Fano peaks increases by decreasing the aspect ratio.•The wavelength of the Fano peaks shows a strong dependence on the periodicity of the array.•The results of this work may be used to build more advanced nanolasers.