Searched for: subject%3A%22Terahertz%255C+imaging%22
(1 - 5 of 5)
document
Hoogelander, M. (author), Alonso Del Pino, M. (author), Llombart, Nuria (author), Spirito, M. (author)
The continuous advancements in the coverage and sensitivity of terahertz direct-detector imagers places increasing constraints on the test benches needed for characterization. Already, relative differences on the order of a few decibels are observed between simulated and measured performance in the state-of-the-art literature. This...
conference paper 2023
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Guestin, L. (author), Adam, A.J.L. (author), Knab, J.R. (author), Nagel, M. (author), Planken, P.C.M. (author)
We have studied theoretically and experimentally the influence of a dielectric substrate on the frequency-dependent terahertz electric near-field of a small hole in a metal layer. We find that the near-field transmission spectrum and the two-dimensional field distribution of an empty hole in a thin metal layer on a substrate are almost identical...
journal article 2009
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Knab, J.R. (author), Adam, A.J.L. (author), Nagel, M. (author), Shaner, E. (author), Seo, M.A. (author), Kim, D.S. (author), Planken, P.C.M. (author)
We present measurements of the complete terahertz (THz) electric near-field distribution, Ex, Ey and Ez, in both the time- and frequency-domains, for subwavelength apertures and subsections of subwavelength aperture arrays. Measuring the individual components of the THz near-field with subwavelength spatial resolution, as they emerge from these...
journal article 2009
document
Groves, R.M. (author), Pradarutti, B. (author), Kouloumpi, E. (author), Osten, W. (author), Notni, G. (author)
Cultural heritage objects are increasingly being investigated using advanced non-destructive optical measurement techniques. Holographic and speckle interferometry based instrumentation allow dimensional measurement of objects at the tens of nanometer scale. For the structural diagnostics of artwork, double-exposure techniques are often used to...
conference paper 2009
document
Adam, A.J.L. (author), Planken, P.C.M. (author), Meloni, S. (author), Dik, J. (author)
We show terahertz reflection images of hidden paint layers in a painting on canvas and compare the results with X-ray Radiography and Infrared Reflectography. Our terahertz measurements show strong reflections from both the canvas/paint interface and from the raw umber/lead white interface, indicating sufficient refractive-index contrast. Our...
journal article 2009
Searched for: subject%3A%22Terahertz%255C+imaging%22
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