Print Email Facebook Twitter Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal Title Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal Author Guestin, L. Adam, A.J.L. Knab, J.R. Nagel, M. Planken, P.C.M. Faculty Applied Sciences Department Imaging Science and Technology Date 2009-09-15 Abstract 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 to that of a hole which is also filled with the same dielectric material as the substrate. For thicker metal layers, however, the near-field spectra of filled and unfilled holes become very different. In addition, for thick metal layers, the two-dimensional field distributions are more strongly affected by the substrate, especially if we allow for an air gap between the metal and the substrate. Our results validate the -somewhat unusual- two-dimensional field distribution measured beneath a hole in a thick metal foil and highlight the effect that a substrate can have on the measurement of the near-field of an object. Subject aperturessubwavelength structuresterahertz imaging To reference this document use: http://resolver.tudelft.nl/uuid:459c1017-7011-4347-ab67-220cc8fc6189 DOI https://doi.org/10.1364/OE.17.017412 Publisher Optical Society of America ISSN 1094-4087 Source http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-20-17412 Source Optics Express, 17 (20), 2009 Part of collection Institutional Repository Document type journal article Rights (c) 2009 Optical Society of America Files PDF Adam_2009.pdf 1.5 MB Close viewer /islandora/object/uuid:459c1017-7011-4347-ab67-220cc8fc6189/datastream/OBJ/view