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Proceedings Article

Fabrication of micro- and nanostructures in thin metallic films by femtosecond laser ablation

[+] Author Affiliations
Vygantas Mizeikis

Shizuoka Univ. (Japan)

Saulius Juodkazis

Swinburne Univ. of Technology (Australia)

Kai Sun, Hiroaki Misawa

Hokkaido Univ. (Japan)

Proc. SPIE 7591, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics III, 75910J (February 11, 2010); doi:10.1117/12.843074
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From Conference Volume 7591

  • Advanced Fabrication Technologies for Micro/Nano Optics and Photonics III
  • Winston V. Schoenfeld; Jian J. Wang; Marko Loncar; Thomas J. Suleski
  • San Francisco, California | January 23, 2010

abstract

We report maskless microfabrication of periodic structures in thin metallic films by femtosecond laser ablation. Two-dimensional (2D) triangular arrays of circular apertures with diameter of about 0.6-0.8 μm and a lattice period of 1.0 and 2.0 μm were fabricated by single- and multiple laser pulse ablation of 35 nm thick gold films sputtered on glass substrates. Optical transmission spectra of the fabricated samples exhibit transmission bands at infrared wavelengths. Theoretical modeling of the optical properties by Finite-Difference Time-Domain (FDTD) technique indicates that these bands are associated with localized and propagating surface plasmon (SP) modes. FDTD simulations also indicate substantial resonant enhancement of the near-field intensity at the metal's surface. Laser ablation of thin metallic films is therefore a promising route for fast prototyping of planar metallic micro- and nano-structures applicable as frequency-selective surfaces (FSS) and SP substrates.

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Citation

Vygantas Mizeikis ; Saulius Juodkazis ; Kai Sun and Hiroaki Misawa
"Fabrication of micro- and nanostructures in thin metallic films by femtosecond laser ablation", Proc. SPIE 7591, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics III, 75910J (February 11, 2010); doi:10.1117/12.843074; http://dx.doi.org/10.1117/12.843074


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