Nanostructure processing by near-field with femtosecond laser excitation: Process switching and SERS application

Minoru Obara, Tatsunori Sakano, Tetsuo Sakai, Henry Nugroho, Tomoya Miyanishi, Yuto Tanaka, Toshiharu Saiki, Nikolay N. Nedyalkov, Petar A. Atanasov

Research output: Contribution to journalConference articlepeer-review


This paper describes two topics. (1): Nano-processing by near-field optics can fabricate nano-scale structures even with near-infrared 800 nmTi:saphire laser. New phenomena using particles, leading to a new nano-processing technique via plasmonics, even with the use of dielectric particles is reported. The physics of nano-hole fabrication process is switchable simply by the laser fluence. (2): ZnO nanorod arrays on Si (100) substrate were grown by pulsed laser deposition (PLD) method, and then coated with Au. Two samples of Au-coated nanorod arrays with different average diameters of 150 nm and 400 nm were prepared to investigate the size dependence of the surface enhanced Raman scattering (SERS). The diameter of the nanorods was well controllable by the substrate position during PLD. High SERS enhancement was observed from both Au-coated ZnO nanorod arrays. The Raman spectra of Rhodamine 6G (R6G) as low as 1 nM were measured with average diameter of 400 nm at an excitation wavelength of 532 nm.

Original languageEnglish
Article number702703
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2008
Event15th International School on Quantum Electronics: Laser Physics and Applications - Bourgas, Bulgaria
Duration: 2008 Sept 152008 Sept 19


  • Femtosecond laser ablation
  • Nano-plasmonics
  • Pulsed-laser deposition
  • SERS
  • ZnO nanorods

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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