title: Massively sub-wavelength guiding of electromagnetic waves.
abstract: Recently a new form of ultra-thin flexible waveguide consisting of a conducting comb-like structure with a thickness of the order of 1/600(th) of the operating wavelength was presented. However, whilst the thickness of the guide was massively sub-wavelength, the remaining dimensions (the height and period of the comb) were much longer. In this paper we propose, and experimentally verify, that a modified guiding geometry consisting of a chain of ultra-thin conducting spirals allows guiding of electromagnetic waves with wavelengths that are many times (40+) longer than any characteristic dimension of the guide, enabling super-sub-wavelength guiding and localisation of electromagnetic energy.
authors.affiliation: Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL.
authors.forename: I R
authors.initials: IR
authors.lastname: Hooper
authors.affiliation: Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL.
authors.forename: B
authors.initials: B
authors.lastname: Tremain
authors.affiliation: Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL.
authors.forename: J A
authors.initials: JA
authors.lastname: Dockrey
authors.affiliation: Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, EX4 4QL.
authors.forename: A P
authors.initials: AP
authors.lastname: Hibbins