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Published on: June 16, 2023
Two-step femtosecond laser pulse train fabrication of nanostructured substrates for highly surface-enhanced Raman
Lan Jiang1, Dawei Ying, Xin Li
1Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China. jianglan@bit.edu.cn
Abstract:
A simple and repeatable method using femtosecond laser pulse train to fabricate nanostructured substrates with silver nanoparticles over a large area for surface-enhanced Raman scattering is reported. The method involves two steps: (1) femtosecond laser pulse train micromachining and roughening and (2) femtosecond laser processing of the substrates in a silver nitrate solution. Surface modification is investigated experimentally by varying the time delay of the double femtosecond laser pulse train. With time delay ranging from 200 to 600 fs, the different enhancement factors were observed. This study demonstrates that a maximum enhancement factor of 6.8×10(6), measured by 10(-6) M Rhodamine 6G solution, can be achieved at the time delay of 400 fs.
