Applied Physics A

, Volume 96, Issue 4, pp 843–850

Femtosecond-laser nanofabrication onto silicon surface with near-field localization generated by plasmon polaritons in gold nanoparticles with oblique irradiation

  • T. Miyanishi
  • T. Sakai
  • N. N. Nedyalkov
  • M. Obara
Article

DOI: 10.1007/s00339-009-5313-0

Cite this article as:
Miyanishi, T., Sakai, T., Nedyalkov, N.N. et al. Appl. Phys. A (2009) 96: 843. doi:10.1007/s00339-009-5313-0

Abstract

Nanohole fabrication process with gold nanoparticles irradiated by femtosecond laser at different incident angles is investigated. Nanoparticles with diameter of 200 nm and laser irradiation with center wavelength of 800 nm are used in the present study. The analysis of the electromagnetic field distribution in the near-field zone of the particle is made by simulations based on finite-differential time domain (FDTD) method. It is shown that when gold nanoparticle is irradiated by laser pulse surface plasmon excitation can be induced, and associated with it, high-intensity near field is produced in a limited area around the particle. It is found that the change of the irradiation conditions by means of irradiation from various incident directions gives a possibility of laser nanoprocessing with tunable characteristics. Our results show that enhanced optical intensity is able to be induced on the substrate surface regardless of incident direction of the laser due to the image charge interaction with the substrate. Furthermore, the use of p-polarized laser irradiation at a certain angle gives a minimum of the spatial dimensions of the enhanced zone on the substrate which is about two times smaller than that obtained at normal incidence.

PACS

42.62.-b81.07.-b81.16.-c

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • T. Miyanishi
    • 1
  • T. Sakai
    • 1
  • N. N. Nedyalkov
    • 1
    • 2
  • M. Obara
    • 1
  1. 1.School of Integrated Design EngineeringKeio UniversityYokohama-shiJapan
  2. 2.Institute of ElectronicsBulgarian Academy of SciencesSofiaBulgaria