Hagen Renner

TL;DR: In this article, the essential characteristics of an on-chip optical isolator are reviewed and a discussion of the non-reciprocity requirement is presented, where the authors focus on non-interference.

TL;DR: In this article, the authors show that the structure demonstrated by Feng et al. cannot enable optical isolation because it possesses a symmetric scattering matrix and that one cannot construct an optical isolator by incorporating this structure into any system as long as the system is linear and time-independent and described by materials with a scalar dielectric function.

TL;DR: It is shown here, that the combination of a well-chosen particle geometry with the short range order of a photonic glass has strong synergetic effects and the Fourier transform required for a highly saturated color can be achieved by tailoring the substructure of the motif.

TL;DR: In this article, the Fourier transform required for a highly saturated color can be achieved by tailoring the substructure of the motif, which can be obtained by choosing core-shell particles with a non-monotonous refractive index distribution from the center of the particle through the shell and into the background material.