Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation
We present a mask-free strategy for fabricating two-dimensional subwavelength periodic triangular arrays on tungsten, by focusing two orthogonally polarized and temporally delayed femtosecond laser beams using a cylindrical lens. In stark contrast to the commonly observed structures of either a sing...
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doaj-eaac3ac67f134d93bf46d5b6af8803eb2020-11-25T00:33:52ZengMDPI AGMaterials1996-19442018-11-011112238010.3390/ma11122380ma11122380Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser IrradiationHongzhen Qiao0Jianjun Yang1Jing Li2Qi Liu3Jie Liu4Chunlei Guo5School of Electronic and Electrical Engineering, Shangqiu Normal University, Shangqiu 476000, ChinaState Key Laboratory of Applied Optics, Changchun Institute of Modern Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaKey Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaInstitute of Modern Optics, Nankai University, Tianjin 300071, ChinaSchool of Electronic and Electrical Engineering, Shangqiu Normal University, Shangqiu 476000, ChinaState Key Laboratory of Applied Optics, Changchun Institute of Modern Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaWe present a mask-free strategy for fabricating two-dimensional subwavelength periodic triangular arrays on tungsten, by focusing two orthogonally polarized and temporally delayed femtosecond laser beams using a cylindrical lens. In stark contrast to the commonly observed structures of either a single ablation spot or a one-dimensional grating, we obtained highly uniform periodic triangular arrays on the laser-exposed surface, with three equilateral sides each of 480 nm in length and about 100 nm in modulation depth. The triangular features varied with both the laser energy and the scanning speed. We found that the optical reflectivity of such a surface reduces significantly within the spectral range of 700⁻2500 nm. The triangular structure morphology can also be controlled by varying the time delay between the two laser beams.https://www.mdpi.com/1996-1944/11/12/2380time-delayed femtosecond lasersorthogonal polarizationssubwavelength triangular structurestungsten |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hongzhen Qiao Jianjun Yang Jing Li Qi Liu Jie Liu Chunlei Guo |
spellingShingle |
Hongzhen Qiao Jianjun Yang Jing Li Qi Liu Jie Liu Chunlei Guo Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation Materials time-delayed femtosecond lasers orthogonal polarizations subwavelength triangular structures tungsten |
author_facet |
Hongzhen Qiao Jianjun Yang Jing Li Qi Liu Jie Liu Chunlei Guo |
author_sort |
Hongzhen Qiao |
title |
Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation |
title_short |
Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation |
title_full |
Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation |
title_fullStr |
Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation |
title_full_unstemmed |
Formation of Subwavelength Periodic Triangular Arrays on Tungsten through Double-Pulsed Femtosecond Laser Irradiation |
title_sort |
formation of subwavelength periodic triangular arrays on tungsten through double-pulsed femtosecond laser irradiation |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2018-11-01 |
description |
We present a mask-free strategy for fabricating two-dimensional subwavelength periodic triangular arrays on tungsten, by focusing two orthogonally polarized and temporally delayed femtosecond laser beams using a cylindrical lens. In stark contrast to the commonly observed structures of either a single ablation spot or a one-dimensional grating, we obtained highly uniform periodic triangular arrays on the laser-exposed surface, with three equilateral sides each of 480 nm in length and about 100 nm in modulation depth. The triangular features varied with both the laser energy and the scanning speed. We found that the optical reflectivity of such a surface reduces significantly within the spectral range of 700⁻2500 nm. The triangular structure morphology can also be controlled by varying the time delay between the two laser beams. |
topic |
time-delayed femtosecond lasers orthogonal polarizations subwavelength triangular structures tungsten |
url |
https://www.mdpi.com/1996-1944/11/12/2380 |
work_keys_str_mv |
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1725314511119843328 |