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Microfabrication of Low Cost Frequency Selective Surface for Terahertz Wave by Laser Ablation

Authors
  • Esakkimuthu, Manikandan1
  • Suseela, Sreeja Balakrishnapillai1
  • Sankarrajan, Radha1
  • Gupta, Abhishek2
  • Prabhu, Shriganesh2
  • 1 SSN College of Engineering, Department of Electronics and Communication Engineering, Chennai, 603110, India , Chennai (India)
  • 2 Tata Institute of Fundamental Research, Department of Condensed Matter Physics and Material Science, Mumbai, 400005, India , Mumbai (India)
Type
Published Article
Journal
Journal of Electronic Materials
Publisher
Springer US
Publication Date
Feb 13, 2019
Volume
48
Issue
4
Pages
2423–2429
Identifiers
DOI: 10.1007/s11664-019-07008-w
Source
Springer Nature
Keywords
License
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Abstract

A method of fabricating and characterizing terahertz frequency selective surface filters from a low-cost silver adhesive tape has been reported in this paper. The proposed filter was initially evaluated numerically using the method of moment’s simulation and verified experimentally by terahertz time-domain spectroscopy technique. The numerical results show that the cross aperture frequency selective surface has angle-resolved and polarization independent operation. The proposed silver adhesive tape and conventional copper-based frequency selective surface have been fabricated using a laser micromachining process. A 20 ns-pulsed laser operating at 1064 nm wavelength was used to create the desired structure by ablation mechanism in the copper film. The pattern ablated by the laser is a cross-shaped slit on copper and silver adhesive tape. The patterned structure was designed to resonate at 0.25 THz by the cross-arm structure. The fabricated structure shows the peak transmittance of 90% with a full-width half maximum of 48% with respect to the resonance. The adhesive tape based frequency selective surface provides similar transmission characteristics compared to a conventional frequency selective surface.

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