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Fast Fabrication of Fishnet Optical Metamaterial Based on Femtosecond Laser Induced Stress Break Technique

Authors :
Kai-Xin Zhang
Jian-Da Shao
Guo-Hang Hu
Ying-Jie Chai
Hong-Bo He
Mei-Ping Zhu
Da-Wei Li
Xiao-Feng Liu
Source :
Nanomaterials, Vol 11, Iss 3, p 742 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

To speed up the fabrication of optical metamaterials by making use of the fast speed advantage of femtosecond laser preparation, a metamaterial appropriate for femtosecond laser processing was designed, and the interaction between femtosecond laser and metal-dielectric-metal fishnet stacks was investigated in detail. Two kinds of processing mechanisms, thermal melting and stress break, were revealed during the fabrication. The thermal melting process, dominated by the interaction of femtosecond laser with metals, makes the upper and lower metal layers adhere to each other, which leads to the magnetic resonance impossible. The stress break process, dominated by the interaction of femtosecond laser with dielectrics, can keep the upper and lower metal coatings isolated. Fishnet optical metamaterial was fabricated by femtosecond laser-induced stress break technique, using back side ablation, high numerical aperture and super-Gaussian beam. The resolution and speed can reach 500 nm, and 100 units/s, respectively. Spectrophotometer measurement results proved that the magnetic resonances were found in the fishnet nanostructure. The theoretical refractive index of the metamaterial on a glass substrate reached −0.12 at the wavelength of 3225 nm. It proved that femtosecond laser-induced stress break was a good and fast tool during the fabrication of optical metamaterials.

Details

Language :
English
ISSN :
20794991
Volume :
11
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Nanomaterials
Publication Type :
Academic Journal
Accession number :
edsdoj.3942444af7b45ccbb7d03b6b47f9d6d
Document Type :
article
Full Text :
https://doi.org/10.3390/nano11030742