4 papers
Symmetry-Protected Lossless Modes in Dispersive Time-Varying Media
Calvin M. Hooper, James R. Capers, Ian R. Hooper +1
We give an exact application of a recently developed, operator-based theory of wave propagation in dispersive, time-varying media. Using this theory we find that the usual symmetry…
Manipulating the Quasi-Normal Modes of Radially Symmetric Resonators
James R Capers, Dean A Patient, Simon A R Horsley
We derive two methods for simultaneously controlling the resonance frequency, linewidth and multipolar nature of the resonances of radially symmetric structures. Firstly, we formul…
Generalising the Yagi-Uda Antenna: Designing Disordered Metamaterials to Manipulate Antenna Radiation
J. R. Capers, L. D. Stanfield, J. R. Sambles +4
Next generation microwave communications systems face several challenges, particularly from congested communications frequencies and complex propagation environments. Taking inspir…
Designing Collective Non-local Responses of Metasurfaces
J. R. Capers, S. J. Boyes, A. P. Hibbins +1
We propose a numerically efficient `adjoint' inverse design method to optimize a planar structure of dipole scatterers, to manipulate the radiation from an electric dipole emitter.…