title: A Wide-angle Multi-Octave Broadband Waveplate Based on Field Transformation Approach.
abstract: Transformation optics (TO) offers a geometrical approach in designing optical components of any shapes. Although it has been proven to be a versatile and robust mathematical tool, TO has, however, limited control over electromagnetic (EM) field polarization in the process of coordinate transformation. Such a technique can be extended to a so-called "Field transformation (FT)" which provides direct control over the impedance and polarization signature of an arbitrary object. In this work, we demonstrate a FT application by designing and manufacturing a novel waveplate, which defies the fundamental limit of bandwidth and incident angles and has the ability of converting between TE (transverse electric) and TM (transverse magnetic) as well as LCP (left-handed circular polarization) and RCP (right-handed circular polarization). Such a waveplate can also be applied to different operating modes for both transmitted and reflected waves by adjusting its thickness and adding an optional metallic ground plane. The proposed design approach presents a remarkable degree of advance for designing future devices with arbitrary polarization controls, artificial waveguides or antenna substrates and polarization-enabled resonators with angle-insensitive functionalities. Our approach has far reaching implications applicable from radio to optical frequencies.
authors.affiliation: School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, United Kingdom.|School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Junming
authors.initials: J
authors.lastname: Zhao
authors.affiliation: School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, United Kingdom.
authors.forename: Lianhong
authors.initials: L
authors.lastname: Zhang
authors.affiliation: School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom.
authors.forename: Jensen
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Advanced Technology Centre, BAE Systems, Filton, FPC267, Bristol BS34 7QW.
authors.forename: Amy
authors.initials: A
authors.lastname: Dyke
authors.affiliation: Advanced Technology Centre, BAE Systems, Filton, FPC267, Bristol BS34 7QW.
authors.forename: Sajad
authors.initials: S
authors.lastname: Haq
authors.affiliation: School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, United Kingdom.
authors.forename: Yang
authors.initials: Y
authors.lastname: Hao