García Meca, CarlosOrtuño Molinero, RubénMartí, J.Martínez, Alejandro2018-09-052018-09-0520141367-263010.1088/1367-2630/16/2/023030https://academica-e.unavarra.es/handle/2454/30525We present a method that enables the implementation of full three-dimensional (3D) transformation media with minimized anisotropy. It is based on a special kind of shape-preserving mapping and a subsequent optimization process. For sufficiently smooth transformations, the resulting anisotropy can be neglected, paving the way for practically realizable 3D devices. The method is independent of the considered wave phenomenon and can thus be applied to any field for which a transformational technique exists, such as acoustics or thermodynamics. Full 3D isotropy has an additional important implication for optical transformation media, as it eliminates the need for magnetic materials in many situations. To illustrate the potential of the method, we design 3D counterparts of transformation-based electromagnetic squeezers and bends.14 p.application/pdfeng© 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.MetamaterialsTransformation opticsQuasi-conformal mappingsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess