Photonic amorphous structure (PAS) has attracted increasing research attention due to their interesting characteristics, such as noniridescent structural colors and isotropic photonic band gap. In this work, we present PAS with different characteristic lengths and analyze their structural and topological properties. First, a Fourier spectral method was used to solve Cahn-Hilliard equation and generate a spinodal binary phase structure. By changing the time of the evolution of phase field, mobility, and standard deviation, the characteristic length of amorphous structures can be adjusted. We present the numerical analysis based on finite-difference time-domain (FDTD) method to characterize the density of state (DOS) of PAS based on different time of the evolution of phase field. The corresponding spatial Fourier spectrum of PAS is calculated to examine the characteristic length, and the photonic band gap properties will be discussed in association with the characteristic length. These results are crucial for design of new optical materials display devices base on dielectric amorphous photonic structures.

Date Published: 21 April 2016
PDF: 7 pages
Proc. SPIE 9885, Photonic Crystal Materials and Devices XII, 98851J (21 April 2016); doi: 10.1117/12.2227782

Published in SPIE Proceedings Vol. 9885:
Photonic Crystal Materials and Devices XII
Dario Gerace; Gabriel Lozano; Christelle Monat; Sergei G. Romanov, Editor(s)