3D Microstructured Frequency Selective Surface Based on Carbonized Polyimide Films for Terahertz Applications

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Original languageEnglish
Article number2102178
Journal / PublicationAdvanced Optical Materials
Volume10
Issue number8
Online published2 Mar 2022
Publication statusPublished - 19 Apr 2022

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Abstract

In recent years, frequency selective surface (FSS)-based two-dimensional (2D) and three-dimensional (3D) carbon materials such as carbon nanofibers, carbon nanotubes, and carbon-filled filaments are essential tools to design millimeter-wave radomes, absorbers, electromagnetic interference (EMI) shielding, and antenna reflectors in gigahertz (GHz) regimes. Terahertz (THz) technologies are gaining attentions from medical imaging to security surveil-lance. In this work, a 3D microstructured FSS using carbon-based polyimide as a precursor to enhance the resonant frequency at the THz range. Furthermore, gold nanoparticles (AuNPs) are embedded on 3D microsturctured carbon-ized polyimide (3D-CPI) film to improve their FSS property through plasmonic effects. From the time domain spectroscopy measurements, 3D-CPI FSS film shows band-stop filter properties in the frequency range of 0.5–1.5 THz and with a maximum return loss (RL) of 40.5 dB (at the resonant frequency of 1 THz). The 3D-CPI/AuNPs film demonstrates the highest RL of 43.7 dB at the higher excitation resonance frequency ≈1.06 THz due to the interaction of plas-monic electrons with scattered delocalized electrons in carbon, which induces the mechanisms for EMI shielding. The results will open insight into 3D plas-monic carbon microstructures as an EMI shielding material at THz frequency.

Research Area(s)

  • band stop filter, carbon materials, EMI shielding, frequency selective surface, terahertz spectroscopy

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