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

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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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Authors and Affiliations

  1. Center for Physical Sciences and Technology, 02300, Vilnius, Lithuania

    B. Voisiat, A. Bičiūnas, I. Kašalynas & G. Račiukaitis

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  1. B. Voisiat
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  2. A. Bičiūnas
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  3. I. Kašalynas
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  4. G. Račiukaitis
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Correspondence to B. Voisiat.

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Voisiat, B., Bičiūnas, A., Kašalynas, I. et al. Band-pass filters for THz spectral range fabricated by laser ablation. Appl. Phys. A 104, 953–958 (2011). https://doi.org/10.1007/s00339-011-6456-3

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  • DOI: https://doi.org/10.1007/s00339-011-6456-3

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