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Semiconductor nanowires and nanostructures have a great potential for Terahertz generation and detection, especially because certain materials properties such as optical absorption, high electron and hole mobility, and short carrier lifetime can be engineered through structural changes and material compositions. In such structures, the variation in geometry and surface charge characteristics can greatly...
Spatially different arrangements of identical metaatoms in a unit cell bring about distinct properties in stereometamaterials. Integrating the stereometamaterial into a perfect metamaterial absorber, we designed, fabricated, and characterized a device with single or double band absorption responses and an absorption/reflection switching characteristic dependent upon the polarization of the incident...
Terahertz time domain spectroscopy in the range 0.3–1.5 THz has been conducted for D-glucose at physiological concentrations from 25–200 mg/dL in pure water and in 0.9% saline by mass. The results show that the ions do not uniformly affect absorption of aqueous glucose, so NaCl ions should not be modeled simply as transparent holes in the water framework.
In this study, we utilize Terahertz imaging to study the effects of hydrofluoric acid on both compact bone tissue and cartilage. We compare the differences observed in the exposure for formalin fixed and raw, dried, tissue as well as those resulting from a change in Hydrofluoric (HF) concentration. Measurements are performed with THz-TDS, and a variety of spectroscopic based image reconstruction techniques...
Here we present a novel qausi-static dynamic RLC model for terahertz perfect absorbers. The model fits perfectly to both simulation and measurement data for our designed absorber. By using this model we analyze our simulated and fabricated perfect absorber to figure out operational mechanism behind these kinds of absorbers. The model can explain well the physical principle behind these kinds of absorbers...
In recent years a great amount of research has been focused on metamaterials, initially for fabrication of left-handed materials for use in devices such as superlenses or electromagnetic cloaking. Such devices have been developed and demonstrated in regimes from the radio frequency all the way to infrared and near optical frequencies. More recently, it has been shown that by careful adjustment of...
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