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In this paper, experimental characterization and modeling of inhomogeneous materials from RF, mm-Wave to THz frequencies with emphasis on anisotropic materials including Liquid Crystal Polymers (LCP) and patterned silicon substrates using DT mesh are presented. Network-based broadband extraction of complex permittivity values and dissipation factors for various materials are discussed towards derivation...
Terahertz waves can penetrate opaque materials and fingerprint spectra appear as those in infrared bands. The technique is expected to be used as a new non-invasive analysis method for various materials. The authors have applied terahertz time domain spectroscopy (THz-TDS) to observe cracks of two types of fibre-reinforced polymers (FRPs) which were Kevlar-and Carbon — FRPs in reflection mode. Internal...
This paper presents a CW raster-scanning THz imaging setup used to perform Non-Destructive Testing of Kevlar™ and carbon fibre samples. The setup uses a 2.5 THz Quantum Cascade Laser as a source. Delamination defect in a Kevlar sample was detected showing a sensitivity to laser polarization orientation. Detection of a break in a carbon/epoxy sample was also performed.
Using a single‐mode dielectric‐loaded surface plasmon polariton waveguide doped with quantum dots, we were able to slightly increase the propagation length of the mode by stimulated emission of plasmon. We analyse the amplification phenomenon in the visible range by combining leakage radiation microscopy and surface plasmon coupled emission techniques.
This paper reports on the experimental observation of the displacement of a surface plasmon resonance (SPR) excited by a metallic diffraction grating. This effect is achieved by the use of an electro-optical material composed of nano-sized droplets of liquid crystals dispersed in a host polymer. The average refractive index of this material in the form of a thin film on the undulated metal surface...
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