4 papers · 1 filter
Frequency sorting in graded dispersive resonator arrays via volume-interaction matrices
Konstantinos Alexopoulos
We study graded arrays of highly dispersive subwavelength resonators through their volume-potential matrix reduction. The reduction gives a finite-dimensional nonlinear resonance p…
Non-singular hotspots between closely spaced high-index nanoparticles
Konstantinos Alexopoulos, Bryn Davies, Pierre Millien
We study the concentration of the field between two nearly touching high-index dielectric resonators in three dimensions. The model is a scalar Helmholtz transmission problem in th…
Topological interface modes in systems with damping
Konstantinos Alexopoulos, Bryn Davies, Erik Orvehed Hiltunen
We extend the theory of topological localised interface modes to systems with damping. The spectral problem is formulated as a root-finding problem for the interface impedance func…
Topologically protected modes in dispersive materials: the case of undamped systems
Konstantinos Alexopoulos, Bryn Davies
This work extends the theory of topological protection to dispersive systems. This theory has emerged from the field of topological insulators and has been established for continuu…