Metamaterial Resonant Absorbers for Terahertz Sensing
Naval Postgraduate School Naval Postgraduate School United States
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The aim of this work is to develop a metamaterial absorber that can be incorporated into a terahertz THz imaging system with a 4.7 THz quantum cascade laser QCL illumination source. Finite element FE simulations were utilized to design metamaterials, and a Fourier transform infrared spectrometer FTIR was employed to characterize the absorption spectrum of each metamaterial configuration. Process parameters for future work with the microfabrication devices have been established for the Naval Postgraduate School clean room. Analysis of experimental data provided insight in determining the refractive index of the metamaterial dielectric, SiOx, from 38 THz and confirmed the Lorentzian shape for the absorption spectrum as theoretically proposed by another group. Future work will incorporate the metamaterial absorber design of this research into a more efficient, cost effective, bi-material THz sensor that can be employed in a variety of naval applications.