Applied Physics A

, Volume 104, Issue 3, pp 953–958 | Cite as

Band-pass filters for THz spectral range fabricated by laser ablation

  • B. Voisiat
  • A. Bičiūnas
  • I. Kašalynas
  • G. Račiukaitis
Article

Abstract

The terahertz resonant metal-mesh filters were fabricated using the laser direct writing technique. UV picosecond laser was employed to cut matrixes of cross-shaped holes in stainless steel foil and molybdenum layer deposited on polyimide substrate. Different laser processing strategies were developed: holes were cut through in the metal foil and the molybdenum film was removed from the polyimide by laser ablation. Band-pass filters with a different center frequency were designed and fabricated. The regular shape, smoothness of edges and sharpness of corners of the cross-shaped holes in the metal were the main attributes for quality assessment for the laser ablation process. Spectral characteristics of the filters, determined by the mesh period, cross-arm length, and its width, were investigated by terahertz time-domain spectroscopy and conventional space-domain Fourier transform spectroscopy. Experimental data were supported by three-dimensional finite-difference time-domain simulations.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • B. Voisiat
    • 1
  • A. Bičiūnas
    • 1
  • I. Kašalynas
    • 1
  • G. Račiukaitis
    • 1
  1. 1.Center for Physical Sciences and TechnologyVilniusLithuania

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