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We show how a photonic crystal prism can be used to filter a broadband terahertz beam using the properties of negative and positive refraction. Different components of a broadband beam incident on the structure may be positively or negatively refracted, depending upon its frequency. Therefore, the structure can be used as an effective spectral filter of THz radiation.
Here we present a silicon based, micro‐machined fluidic device for terahertz frequencies, fabricated using standard lithographic and micro‐machining processes in a cleanroom environment. Designed for use in a conventional transmission terahertz time‐domain spectroscopy (THz‐TDS) arrangement, we present a possible solution to the ‘water problem’ currently hampering the analysis of aqueous and biological...
In this paper, we present experimental results showing how appropriately designed and constructed artificial materials can be used to refract negatively terahertz frequency light without the need for the materials to have both a negative permeability and a negative permittivity.
In this paper we report on the design, fabrication and testing of a silicon based, microfluidic device, for transmission THz-TDS. Testing of the device and the associated data extraction algorithms is accomplished by the analysis of primary alcohol/water mixtures, where quantities of 2 μmol can be distinguished between samples. The analysis of commercial whiskeys shows clear absorption differences...
We demonstrate here, for the first time, the construction of artificial materials, which theoretically possess two separate pass-bands utilizing the difference between positive and negative refraction in the terahertz frequency regime. Experimental testing of these devices is currently being undertaken using both broadband pulsed sources and narrow frequency quantum cascade lasers.
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