中文 |

Newsroom

Researchers Demonstrate Single Nanowire Fabrication by Femtosecond Laser

Nov 04, 2021

In a study published in Nanomaterials, Dr. ZHAO Zhen from Changchun Institute of Optic, Fine Mechanics and Physics (CIOMP) of the Chinese Academy of Sciences (CAS), and his collaborators, found that single uniform nanowire can be fabricated by femtosecond laser with the help of a groove.
Single Nanowire, a fundamental structure element, is widely used in modern photonic equipment because of its fascinating capabilities in manipulating light. Compared with traditional fabrication method of microstructures, the fabrication method of laser-induced periodic surface structure (LIPSS) has the advantages such as no need for masks. However, LIPSS usually consists of numerous nanowires of uncontrolled formation number. How to fabricate single nanostructure remains an open question.

The researchers in this study selected the Fe-based metallic glass surface with prefabricated groove as the sample as the groove can effectively focus light energy and guide the formation of energy difference. The atomic force microscope shows the V-shaped groove feature sizes of both the upper opening width and the longitudinal depth of 600 ± 9 nm and 110 ± 9 nm, respectively.

Under the irradiation of two time-delayed femtosecond laser beams with consistent linearly polarization parallel to the groove, single nanowire structure with the width of 118 nm can be uniformly generated within the groove. The formation number of the structure can be accurately controlled by changing the feature size of the groove. This is the first time that the fabrication of single nanowire structure was realized using laser-induced methods.

Moreover, the researchers demonstrated the formation mechanism of single nanowire, which can be attributed to two physical ultrafast dynamic processes. Under laser irradiation, the magnetic surface wave on sample surface first excite and interfere with the incident femtosecond laser, resulting in a periodic energy filed formation on the sample. Subsequently, due to the higher energy distribution within the groove, with suitable incident laser energy, the LIPSS can be restricted to only within the groove, while the area outside the groove can remain smooth sample surface.

The study solved the problem of the uncontrolled structure formation number in the field of laser induced structure, and presented a convenient solution of single nanowire fabrication.

 

The schematic image of the single nanowire within the groove fabricated by the femtosecond laser (Image by Dr. ZHAO) 

Contact

ZHAO Zhen

Changchun Institute of Optics, Fine Mechanics and Physics

E-mail:

Regular Nanowire Formation on Fe-Based Metal Glass by Manipulation of Surface Waves

Related Articles
Contact Us
  • 86-10-68597521 (day)

    86-10-68597289 (night)

  • 86-10-68511095 (day)

    86-10-68512458 (night)

  • cas_en@cas.cn

  • 52 Sanlihe Rd., Xicheng District,

    Beijing, China (100864)

Copyright © 2002 - Chinese Academy of Sciences