Two-step femtosecond laser pulse train fabrication of nanostructured substrates for highly surface-enhanced Raman scattering

Lan Jiang, Dawei Ying, Xin Li, Yongfeng Lu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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 × 106, measured by 10-6 M Rhodamine 6G solution, can be achieved at the time delay of 400 fs.

Original languageEnglish (US)
Pages (from-to)3648-3650
Number of pages3
JournalOptics Letters
Volume37
Issue number17
DOIs
StatePublished - Sep 1 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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