Abstract
In this paper, we report a thorough investigation of the optical properties of a 3D spiral-staircase structure of metallic nanorods by means of rigorous full-electrodynamic calculations.Weanalyzethenatureofthephotoniceigenmodesofthis crystal in the light of group theory and explain their physical origin. Moreover, we study the change in the polarization state of a wave transmitted through a finite slab of the crystal and reveal the occurrence of strong optical activity effects. Finally, we provide a consistent interpretation of negative refraction,whichcanoccurwithincertainregionsoffrequency and angles of incidence on a specific surface of the crystal, by reference to relevant isofrequency contours obtained from detailed photonic band-structure calculations. It is worth noting that the structure under consideration does not support purely left- and right-circularly polarized (LCP and RCP, respectively) eigenmodes, in contrast to mostly studied chiral metamaterials with, e.g., C4 symmetry. 17‐23,34‐36,38‐40,42,43,45,46
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
